Full-spectrum light emitting device and full-spectrum white light emitting device

Abstract

The present invention relates to a full spectrum light emitting device comprising: a solid state light source for generating excitation light having a dominant wavelength in the range of 420 nm to 480 nm, said excitation light consisting of a plurality of light emissions of different dominant wavelengths; a photoluminescent material for generating light having a peak emission wavelength in the range of 490 nm to 680 nm; wherein the device is used for generating light with a spectrum; from the wavelength range of 430 nm to 520 nm, the maximum percentage intensity deviation of the light from the intensity of the black body curve or CIE standard luminophor D is less than 60%.

Description

[0001] Cross-reference of related applications

[0002] The application claims priority to U.S. Provisional Patent Application No. 62 / 872,277, filed July 9, 2019, and U.S. Utility Patent Application No. 16 / 517,524, filed July 19, 2019, the entire contents of which are hereby incorporated by reference. Technical Field

[0003] Embodiments of the present invention relate to an all-solid-state spectral white light-emitting device comprising a photoluminescent wavelength conversion material. More specifically, but not exclusively, embodiments relate to a full-spectrum white light-emitting device for generating full-spectrum white light having a spectrum from blue to red light that approximates natural sunlight. Background Technology

[0004] White LEDs (“white LEDs”) comprise one or more photoluminescent materials (typically inorganic phosphors) that absorb a portion of the blue light emitted by the LED (a solid-state excitation source) and re-emit visible light of a different color (wavelength). The combination of the portion of blue light produced by the LED that is not absorbed by the phosphor material and the light emitted by the phosphor provides light that appears white to the eye. Due to their expected long operating life (>50,000 hours) and high efficiency (100 lumens per watt and higher), white LEDs have rapidly replaced conventional fluorescent lamps, compact fluorescent lamps, and incandescent lamps.

[0005] Various metrics exist for quantifying the characteristics and quality of light produced by white lighting sources. Two of the most commonly used metrics in the solid-state lighting industry are correlated color temperature (CCT) and the International Commission on Illumination (CIE) general color rendering index (CRI) Ra.

[0006] The CCT of a lighting source is measured in Kelvin (K) and is the color temperature of the Planck (blackbody) radiator that corresponds to the color of the light produced by the lighting source.

[0007] The general CRI Ra is a measure of how faithfully a light source renders the true colors of an object, based on a comparison of illumination from eight color test samples (R1 to R8) with illumination provided by a reference source. Generally, the higher the value, the closer it is to black radiators and natural daylight. The general CRI Ra can take negative values ​​and has a maximum value of 100. Since color samples R1 to R8 are all soft colors (low-saturation colors from "light gray-red" to "reddish-purple"), the general CRI Ra provides a useful measure of subtle differences in the light output of an incandescent light source that produces a full spectrum close to daylight. However, for white LEDs with a spectrum composed of peaks, the general CRI Ra proves insufficient because it is an average measure of color rendering over a limited color range and does not provide information about the performance of a light source for a specific color or highly saturated color. Therefore, when characterizing a full-spectrum solid-state white light-emitting device, the CRI color samples R9 to R12 (saturated colors "saturated red", "saturated yellow", "saturated green", "saturated blue") and R13 to R15 ("light skin", "leaf green", "medium skin") should be considered to give meaningful characterization of the full spectrum of light.

[0008] Good lighting design is inherently human-centered because lighting can influence human sleep cycles, circadian rhythms, alertness, and other non-visual responses. The safety of LED (solid-state) lighting for human health has been a subject of recent scrutiny. There is growing concern that artificial light disrupts normal physiological and psychological regulation, such as hormone synthesis, sleep-wake cycles, and alertness levels. Specifically, recent evidence indicates that high color temperatures (5000K) and high illuminance (e.g., light produced by LEDs) suppress melatonin secretion before sleep and reduce subjective alertness. Blue light has also been reported to affect organisms more readily than other colors by disrupting biological processes that depend on the natural day-night cycle (circadian rhythm). Exposure to blue light at night and during the night is believed to be potentially harmful to health.

[0009] Various indicators have been proposed for predicting the effects of melatonin suppression. Two more common indicators for measuring circadian stimulation are (i) the circadian action factor (CAF) and (ii) the melanopsin response (MR). CAF and MR are the ratio of radiative circadian photoreceptive efficacy (CER) to radiative photoreceptive efficacy (LER) and each provides a measure of the brain's sensitivity to light; that is, a measure of the human body's non-visual sensitivity to light. CAF is based on studies that measure human melatonin levels before and after exposure to light of a specific wavelength to establish a circadian action spectrum (CAS) or a circadian sensitivity spectrum c(λ). CAF (denoted as a) cvThe radiative circadian rhythm efficiency (MR) is the ratio of radiative circadian rhythm efficiency to photopic efficiency. The MR is based on the absorption spectrum of melanopsin photopigment found in mammalian ipRGCs (intrinsically photosensitive retinal ganglion cells) to establish the melanopsin response (sensitivity) spectrum m(λ). MR is the ratio of radiative circadian rhythm efficiency to photopic efficiency. Recently, a new index weighted to the spectral response of ipRGCs, the Equivalent Melanopsis Lux (EML), has been proposed.

[0010] A further potential problem with LED lighting is photoretinitis, the possibility of photochemical damage to the retina, which can be caused by excessive exposure to violet to blue light. This is known as blue light hazard (BLH) and is similar to CAF and MR in that it has a corresponding blue sensitivity spectrum b(λ). The risk of BLH is sometimes associated with LEDs, even if white-emitting LEDs do not contain significantly more blue light than other types of sources at the same color temperature. That is, for high CCT (≥5000K) white LEDs, BLH is a potential eye health problem because the blue peak produced by said LEDs is extremely high in the CAF and MR wavelength regions of the spectrum. According to current international standards, light sources emitting white light and used in general lighting applications are not considered harmful to the retina of healthy adults. That is, the optical safety of special lamps or colored light sources must be considered on a case-by-case basis, and light sources used around vulnerable populations (such as infants or adults with certain types of eye diseases) require additional evaluation.

[0011] Currently, in the LED lighting industry, full-spectrum LED devices aim to produce white light with a typical CRI Ra of 100, as exhibited by incandescent lamps and blackbody radiation. However, it has been found that such LEDs sacrifice 15% to 30% in efficiency compared to white LEDs that produce light with a CRI Ra of approximately 80 (CRI80).

[0012] This invention aims to overcome at least partially the shortcomings of known solid-state white light-emitting devices and provide a human-centered full-spectrum white light-emitting device with performance that is at least close to or exceeds that of current CRI80 devices. Summary of the Invention

[0013] The present invention relates to a full-spectrum white light-emitting device for generating full-spectrum white light with a spectral content ranging from blue wavelengths to red wavelengths that is as close as possible to natural sunlight.

[0014] Specifically, although not exclusively, at least some embodiments of the present invention relate to white light-emitting devices for generating white light in the blue to cyan wavelength region of the visible spectrum that approximates natural light. According to embodiments of the invention, such white light-emitting devices generate full-spectrum white light approximates natural light in the blue to cyan wavelength region (430 nm to 520 nm), in which human non-visual perception, as measured by the circadian rhythm factor (CAF) and melanopsin response (MR), is most significantly affected. It is believed that white light with this spectral characteristic is beneficial to human well-being because this portion of the wavelength spectrum affects melatonin secretion, which can influence the circadian rhythm cycle. The full-spectrum white light-emitting device according to the invention utilizes a broadband solid-state excitation source, such as a blue LED, which generates broadband excitation light having a dominant wavelength from about 420 nm to about 480 nm (i.e., in the blue wavelength region of the visible spectrum). In this specification, "broadband" is used to mean light having a full width at half maximum (FWHM) of at least 25 nm. For example, the widest wavelength range (FWHM) can be at least 30 nm or at least 50 nm and can have an FWHM ranging from about 25 nm to about 70 nm; optionally, it can have an FWHM in the range of about 30 nm to about 70 nm. Broadband can also be used to refer to blue light composed of a combination of blue light emitted from at least two different wavelengths in the wavelength range of about 420 nm to about 480 nm. The use of broadband blue excitation light enables the light-emitting device to produce full-spectrum light that approximates natural light in the blue to cyan wavelength region (430 nm to 520 nm) similar to the spectrum.

[0015] Embodiments of the present invention further relate to a full-spectrum white light-emitting device having white light intensity optimized (reduced) at wavelengths corresponding to the red wavelength region of the spectrum to improve efficiency. In an embodiment, the device includes an orange-to-red photoluminescent material whose peak emission wavelength / FWHM is selected to reduce the light intensity (photon count) at wavelengths corresponding to the red wavelength region (range) of the spectrum, specifically reducing the light intensity at wavelengths longer than about 650 nm that may affect the values ​​of CRI R9 (“saturated red”) and CRI R8 (“red-violet”), at which the visual response of the eye (i.e., the photometric function) is typically low (about 0.1).

[0016] According to one aspect of the invention, a full-spectrum white light-emitting device is envisioned, comprising: a photoluminescent material for generating light having a peak emission wavelength from about 490 nm to about 680 nm; and a broadband solid-state excitation source for generating broadband excitation light having a dominant wavelength from about 420 nm to about 480 nm, wherein the device generates white light having a spectrum whose intensity decreases from its maximum value in the orange-to-red wavelength region of the spectrum to about 50% of the maximum value in the wavelength range from about 645 nm to about 695 nm, and wherein, in the wavelength range from about 430 nm to about 520 nm, the maximum percentage intensity deviation of the white light from the intensity of a blackbody curve or CIE standard luminescent material D with the same correlated color temperature is less than 60%. More specifically, the maximum intensity in the orange-to-red region of the spectrum corresponds to photoluminescent conversion (generation) light and the maximum intensity occurs at wavelengths longer than about 570 nm. For example, the maximum intensity may occur at wavelengths in the range from about 590 nm to about 620 nm.

[0017] The situation may be that the maximum percentage intensity deviation of the light emitted by the device is less than at least one of 50%, 40%, 30%, 20%, and 10%.

[0018] The white light may have a CAF of less than 5% of the circadian rhythm factor (CAF) of the blackbody curve or the CIE standard luminescent body D.

[0019] In an embodiment, the white light generated by the device has a CRI R9 and / or CRI R8 of less than 90.

[0020] The situation may be that the white light has a certain spectrum and has a CRI Ra of at least 80, and the intensity of the spectrum decreases from its maximum value in the orange to red wavelength region to about 50% of the maximum value at wavelengths from about 645 nm to about 665 nm.

[0021] The white light may have a certain spectrum and have at least 90 CRI Ra and greater than 50 CRI R9, the intensity of which decreases from the maximum value of the light emitted by the device to about 50% of the maximum value at wavelengths from about 665 nm to about 690 nm.

[0022] In an embodiment, the white light may have a certain spectrum and have at least 95 CRI Ra and greater than 60 CRIR9, the intensity of which decreases from the maximum value of the light emitted by the device to about 50% of the maximum value at wavelengths from about 680 nm to about 695 nm.

[0023] The situation may be that the photoluminescent material includes at least one or a combination of photoluminescent materials that produce light having a peak emission wavelength from about 620 nm to about 655 nm.

[0024] The white light may have a correlated color temperature from about 2700K to about 3000K and the device may have an efficiency of at least 102 lm / W.

[0025] In an embodiment, the white light may have a correlated color temperature from about 4000K to about 6800K and the device may have an efficiency of at least 110 lm / W.

[0026] The situation can generate broadband excitation light with an FWHM of at least 25 nm for the broadband solid-state excitation source.

[0027] The broadband excitation light may comprise a combination of two or more blue light emissions of different wavelengths. The blue light emission of different wavelengths can be generated in two ways: (i) using multiple individual blue LEDs (narrowband LEDs) with different dominant wavelengths or (ii) using, for example, multiple specially designed different quantum wells in an active region to generate multiple individual LEDs emitting blue wavelengths (broadband LEDs). Therefore, the broadband solid-state excitation source may consist of one or more narrowband solid-state light sources; for example, LEDs or laser diodes, each of which "directly" generates narrowband blue light with different dominant wavelengths from 420 nm to 480 nm. In some embodiments, there is a wavelength difference of at least 5 nm between at least two blue light emissions, or a wavelength difference of at least 10 nm between at least two blue light emissions.

[0028] In an embodiment, the broadband solid-state excitation source may include: a first solid-state light source for generating blue light emission with a first dominant wavelength from 420 nm to 480 nm; and a second solid-state light source for generating different blue light emission with a second dominant wavelength from 420 nm to 480 nm. The first dominant wavelength may be from 420 nm to 450 nm; and the second dominant wavelength may be from 450 nm to 480 nm. The broadband blue excitation source may further include a third solid-state light source for generating blue light emission with a third dominant wavelength from 420 nm to 480 nm, the third dominant wavelength being different from the first and second dominant wavelengths.

[0029] Alternatively, broadband solid-state excitation sources also encompass broadband solid-state light sources; for example, broadband blue LEDs, such as InGaN / GaN blue LEDs having active regions that directly generate multiple different wavelengths of blue light emission using different quantum wells in a multiple quantum well (MQW) structure. In some embodiments, the broadband solid-state excitation source comprises an LED having at least two different quantum wells, each of which generates blue light emission with a correspondingly different dominant wavelength.

[0030] The broadband solid-state excitation source of the present invention will be contrasted with known white LEDs, which utilize narrowband blue LEDs that generate blue light with a single narrowband wavelength having a free wave size (FWHM) in the range of 15 nm to 20 nm. The broadband blue solid-state excitation source of the present invention will be further contrasted with known white LEDs that utilize UV ​​solid-state light sources (UV LEDs), wherein the blue excitation light is indirectly generated using a blue luminescent (420 nm to 480 nm) photoluminescent material (phosphor), through a photoluminescence conversion process of UV light. In other words, the broadband solid-state excitation source / white light-emitting device according to the present invention does not utilize / include photoluminescent materials to generate excitation light in the range of 420 nm to 480 nm.

[0031] In an embodiment, the photoluminescent material may include: a first photoluminescent material having a peak emission wavelength from 490 nm to 550 nm; and a second photoluminescent material having a peak emission wavelength from 600 nm to 680 nm.

[0032] According to one aspect, the present invention covers a full-spectrum white light-emitting device comprising: a photoluminescent material for generating light having a peak emission wavelength from about 490 nm to about 680 nm; and a broadband solid-state excitation source for generating broadband excitation light having a dominant wavelength from about 420 nm to about 480 nm, wherein the device generates white light having a correlated color temperature from about 1800 K to about 6800 K and wherein the white light has a spectrum having a CAF within 5% of the CAF of a blackbody curve or a CIE standard luminescent material D at the same correlated color temperature.

[0033] In an embodiment, within a wavelength range from about 430 nm to about 520 nm, there may be a maximum percentage intensity deviation between the intensity of the white light and the intensity of the light from the blackbody curve or the CIE standard luminescent material D with the same correlated color temperature.

[0034] The situation may be that the maximum percentage intensity deviation of the light is less than at least one of 50%, 40%, 30%, 20%, and 10%.

[0035] The white light may have a certain spectrum, the intensity of which decreases to half of its maximum intensity at wavelengths from about 645 nm to about 695 nm.

[0036] In an embodiment, the white light may have a CRI R9 of less than 90.

[0037] The situation could be that the white light has a correlated color temperature from about 2700K to about 3000K and the device has an efficiency of at least 102 lm / W, or the white light has a correlated color temperature from about 4000K to about 6800K and the device has an efficiency of at least 110 lm / W.

[0038] Embodiments of the present invention have found practicality in encapsulated white light-emitting devices, wherein photoluminescent materials (e.g., yellow-to-green and orange-to-red photoluminescent materials) are packaged together with a broadband solid-state excitation source, such as a surface-mountable device, an onboard chip, and a filament. In other embodiments, the photoluminescent material may be positioned remotely from the broadband solid-state excitation source. Attached Figure Description

[0039] These and other aspects and features of the invention will become apparent to those skilled in the art after reviewing the following description of specific embodiments of the invention in conjunction with the accompanying drawings, wherein:

[0040] Figure 1a and 1b Demonstrates a remote phosphor full-spectrum white light-emitting device according to some embodiments;

[0041] Figure 2a It is used according to an embodiment of the present invention. Figure 1a and 1b A schematic diagram of a broadband blue solid-state excitation source in a full-spectrum white light-emitting device;

[0042] Figure 2b It is used according to another embodiment of the present invention. Figure 1a and 1b A schematic diagram of a broadband blue solid-state excitation source in a full-spectrum white light-emitting device;

[0043] Figure 3a This is a schematic cross-sectional view of a full-spectrum white light-emitting device according to some embodiments;

[0044] Figure 3b This is a schematic cross-sectional view of a full-spectrum white light-emitting device according to some embodiments;

[0045] Figure 4a and 4b This is a schematic diagram of a full-spectrum white light-emitting device according to some embodiments;

[0046] Figure 5Demonstration: (A) Intensity spectra and normalized intensity I versus wavelength (nm) for the following three items: (i) a known full-spectrum light-emitting device using a narrow-band excitation source - spectrum represented as A (dotted line), (ii) a full-spectrum light-emitting device using a broadband excitation source according to the present invention - spectrum represented as B (thin solid line), (iii) a blackbody curve (bbc) (dashed line) for the CCT that is nominally the same as that of spectra A and B; and (B) circadian rhythm spectrum (CAS) - thick solid line, relative quantum sensitivity versus wavelength (nm);

[0047] Figure 6 The following four intensity spectra, normalized intensity (normalized to CIE1931XYZ relative brightness Y=100) versus wavelength (nm) are shown: (i) Dev.1 (solid line), (ii) Dev.2 (thick dashed line), (iii) Com.1 (dotted line), and (iv) Planck spectrum (thin dashed line) for a CCT at 2700K that is nominally the same as Dev.1, Dev.2, and Com.1;

[0048] Figure 7a The following five intensity spectra, normalized intensity (normalized to CIE1931XYZ relative brightness Y=100) versus wavelength (nm) are shown: (i) Dev.3 (solid line), (ii) Dev.4 (thick dashed line), (iii) Dev.5 (dotted line), (iv) Com.2 (dotted line), and (v) Planck spectrum (thin dashed line) for a CCT at 3000K that is nominally the same as Dev.3, Dev.4, Dev.5 and Com.2.

[0049] Figure 7b Show the intensity spectra, normalized intensity (normalized to CIE1931XYZ relative brightness Y=100) against wavelength (nm) for the following three items: (i) Dev.4 (solid line), (ii) Com.2 (dotted line), and (iii) Planck spectrum (dashed line) for a CCT of 3000K that is nominally the same as Dev.4 and Com.2.

[0050] Figure 7c Show the intensity spectra, normalized intensity (normalized to CIE1931XYZ relative brightness Y=100) against wavelength (nm) for the following three items: (i) Dev.5 (solid line), (ii) Com.3 (dotted line), and (iii) Planck spectrum (dashed line) for a CCT of 3000K that is nominally the same as Dev.5 and Com.3.

[0051] Figure 8Show the intensity spectra, normalized intensity (normalized to CIE1931XYZ relative brightness Y=100) against wavelength (nm) for the following three items: (i) Dev.6 (solid line), (ii) Com.4 (dotted line), and (iii) Planck spectrum (dashed line) for a CCT of 4000K that is nominally the same as Dev.6 and Com.4.

[0052] Figure 9a Show the intensity spectra, normalized intensity (normalized to CIE1931XYZ relative brightness Y=100) against wavelength (nm) for the following three items: (i) Dev.7 (solid line), (ii) Com.5 (dotted line), and (iii) Planck spectrum (dashed line) for a CCT of 5000K that is nominally the same as Dev.7 and Com.5.

[0053] Figure 9b Show the intensity spectra, normalized intensity (normalized to CIE1931XYZ relative brightness Y=100) against wavelength (nm) for the following three items: (i) Dev.8 (solid line), (ii) Com.6 (dotted line), and (iii) Planck spectrum (dashed line) for a CCT of 5000K that is nominally the same as Dev.8 and Com.6.

[0054] Figure 10 This is a side view of an LED filament lamp according to some embodiments; and

[0055] Figure 11a and 11b According to some embodiments, it is used for Figure 10 A schematic cross-sectional view of the white LED filament light-emitting device in a lamp, showing the BB side and a partial sectional plan view. Detailed Implementation

[0056] Embodiments of the invention will now be described in detail with reference to the accompanying drawings, which provide illustrative examples of the invention to enable those skilled in the art to practice it. It is important to note that the following drawings and examples are not intended to limit the scope of the invention to a single embodiment, and other embodiments are possible by means of some or all of the described or illustrated elements. Furthermore, where certain elements of the invention may be partially or completely implemented using known components, only those portions of such known components necessary for understanding the invention will be described, and detailed descriptions of other portions of such known components will be omitted to avoid obscuring the invention. In this specification, embodiments showing a singular number of components should not be considered limiting; in fact, unless expressly stated otherwise herein, the invention is intended to cover other embodiments comprising a plurality of identical components, and vice versa. Furthermore, unless so expressly stated, the applicant does not intend for any term in this specification or claims to be confined to uncommon or specific meanings. Moreover, the invention covers current and future known equivalents of known components mentioned herein by means of description. Throughout this specification, the same reference numerals preceding the figure numbers are used to denote the same parts.

[0057] Throughout this specification, similar reference numerals following the figure numbers are used to indicate similar features.

[0058] Embodiments of the present invention relate to a white light-emitting device comprising a broadband solid-state excitation source, such as one or more LEDs, operable to generate broadband blue excitation light having a dominant wavelength from 420 nm to 480 nm. In this specification, "broadband" is used to refer to light having a full width at half maximum (FWHM) of at least 25 nm. For example, the FWHM may be at least 30 nm or at least 50 nm and may have an FWHM in the range of 25 nm to 70 nm; optionally, it may have an FWHM in the range of 30 nm to 70 nm. Broadband can also be used to refer to blue light composed of a combination of blue light emitted from at least two different wavelengths in the wavelength range of 420 nm to 480 nm. More specifically, but not exclusively, embodiments of the present invention relate to a white light-emitting device for generating full-spectrum white light in the blue to cyan wavelength region (approximately 430 nm to approximately 520 nm) of the visible spectrum, approximating natural light similar to the visible spectrum.

[0059] Remote phosphor full spectrum white light emitting device

[0060] Figure 1a and 1b This invention describes a remote phosphor solid-state full-spectrum white light-emitting device according to an embodiment of the present invention, wherein... Figure 1a It is a partial cross-sectional plan view and Figure 1bThis is a cross-sectional view through AA. Device 110 is configured to produce full-spectrum white light with CCT (correlated color temperature) ranging from 1800K to 6800K. The device can be used alone or as part of a downlight or other lighting arrangement. Device 110 includes a hollow cylinder 112 consisting of a disc-shaped base 114, a hollow cylindrical wall portion 116, and a removable annular top 118. To aid heat dissipation, the base 114 is preferably made of aluminum, an aluminum alloy, or any material with high thermal conductivity. The base 114 can be attached to the wall portion 116 by screws or bolts, other fasteners, or adhesives.

[0061] Device 110 further includes a plurality of (in) mounted in thermal communication with a circular MCPCB (metal core printed circuit board) 122. Figure 1a and 1b (In one example, there are five) broadband blue solid-state excitation sources 120. Various embodiments of the broadband blue solid-state excitation source 120 are described below. Figures 2a to 4b The following description is provided. To maximize light emission, the device 10 may further include light-reflecting surfaces 124 and 126 that respectively cover the surface of the MCPCB 122 and the inner curved surface of the cylindrical wall 116.

[0062] The device 110 further includes a photoluminescence wavelength conversion component 128, which is positioned remotely from the excitation source 120 and operable to absorb a portion of the excitation light generated by the excitation source 120 and convert the portion into light of a different wavelength through a photoluminescence process. The emission products of the device 110 include combined light generated by the broadband blue excitation source 120 and photoluminescent light generated by the photoluminescence wavelength conversion component 128. The photoluminescence wavelength conversion component may be formed of a light-transmitting material (e.g., polycarbonate, acrylic, silicone, etc.) incorporating a mixture of yellow, red, and / or green phosphors. Furthermore, in embodiments, the photoluminescence wavelength conversion component may be formed of a light-transmitting substrate coated with (a plurality of) phosphor materials. The wavelength conversion component 128 is positioned remotely from the excitation source 120 and spatially separated from it. In this specification, "remotely" and "remotely" indicate a separated or isolated relationship. Typically, the wavelength conversion component and the excitation source are separated by air; in other embodiments, they may be separated by a suitable light-transmitting medium, such as, for example, light-transmitting silicone or epoxy materials. The wavelength conversion component 128 is configured to completely cover the housing opening, allowing all light emitted by the lamp to pass through it. As shown, the wavelength conversion component 128 can be detachably mounted to the top of the wall portion 116 using a top 118, thereby allowing easy modification of the lamp's components and emission color.

[0063] Figure 2aThis is a schematic diagram of a broadband blue solid-state excitation source 220 according to an embodiment of the present invention. The broadband blue solid-state excitation source 220 is configured to generate broadband blue excitation light having a dominant wavelength from 420 nm to 470 nm, i.e., in the blue wavelength region of the visible spectrum. In this embodiment, it also has a wideband wavelength (FWHM) from 25 nm to 50 nm. According to an embodiment of the present invention, the broadband blue solid-state excitation source 220 may include a first solid-state light source 230 and a second solid-state light source 232, wherein the solid-state light source in this example is a narrowband blue LED chip (e.g., a blue-emitting GaN-based LED chip). The first solid-state light source 230 generates a first dominant wavelength λ having a wavelength from 420 nm to 470 nm. d1 The blue light emitted and the second solid-state light source 232 generated a second dominant wavelength λ from 420nm to 470nm. d2 Blue light emission. First and second solid-state light sources are selected such that the dominant wavelengths of the light generated by the sources are different (i.e., λ). d1 With λ d2 (Different). The combination of light from the first and second solid-state light sources 230 / 232 constitutes a broadband blue excitation light output 242 of the broadband blue solid-state excitation source 220, having a dominant wavelength from 420 nm to 470 nm and an FWHM from 25 nm to 50 nm. It will be understood that in other embodiments, the solid-state excitation source may include a single solid-state light source. In this specification, a single solid-state light source is defined as one or more solid-state light sources, each of which produces light having the same (i.e., a single / individual) dominant wavelength and an FWHM of at least 25 nm.

[0064] like Figure 2a As indicated, the broadband blue solid-state excitation source 220 may include a surface-mount device (SMD), such as, for example, an SMD 2835 LED package, wherein the first and second solid-state light source flip chips are bonded to the top surface of the substrate 234. Electrical contacts 236, 238 may be disposed on the bottom surface of the substrate 234 for operating the excitation source. The first and second solid-state light sources 230, 232 may be encapsulated with a light-transmitting optical encapsulant 240 (e.g., silicone or epoxy resin material).

[0065] Figure 2bThis is a schematic diagram of a broadband blue solid-state excitation source 220 according to an embodiment of the present invention. The solid-state excitation source 220 is configured to generate excitation light having a dominant wavelength from 420 nm to 470 nm, i.e., in the blue wavelength region of the visible spectrum. In this embodiment, it also has an FWHM from 25 nm to 50 nm. According to an embodiment of the present invention, the solid-state excitation source 220 includes a broadband solid-state light source 241, which in this example is a single broadband LED, for example, an InGaN / GaN blue LED having an active region with multiple quantum wells (MQWs), as disclosed in Applied Physics Letters 75,1494 (1999) by TranCA et al. entitled "Growth of InGaN multiple-quantum-well blue light-emitting diodes on silicone by metal organic vapor phase epitaxy". Broadband solid-state light source 241 generates broadband blue light with multiple overlapping blue light emissions including peak wavelengths from 420 nm to 470 nm. Therefore, a single solid-state light source 241 generates light with a single / individual dominant wavelength and an FWHM of at least 25 nm.

[0066] like Figure 2b As indicated, the solid-state excitation source 220 may include a surface-mount device (SMD), such as, for example, an SMD2835 LED package, wherein the solid-state light source flip chip is bonded to the top surface of the substrate 234. Electrical contacts 236, 238 may be disposed on the bottom surface of the substrate 234 for operating the excitation source. The solid-state light source 241 may be encapsulated with a light-transmitting optical encapsulant 240 (e.g., silicone or epoxy resin material).

[0067] Encapsulated full spectrum white light emitting device

[0068] Figure 3a This is a schematic cross-sectional view of an encapsulated full-spectrum white light-emitting device 310a according to an embodiment of the present invention. The device 310a is configured to produce full-spectrum white light having a CCT (correlated color temperature) from 1800K to 6800K.

[0069] According to an embodiment of the present invention, device 310a includes a broadband blue solid-state excitation source composed of first and second solid-state light sources 330, 332 (e.g., blue-emitting GaN (gallium nitride) based LED chips) housed within package 344. In a manner similar to / similar to that described above, the first solid-state light source 330 can generate a first dominant wavelength λ having a wavelength from 420 nm to 470 nm. d1The blue light emitted and the second solid-state light source 332 can generate a second dominant wavelength λ from 420nm to 470nm. d2 Blue light emission. The dominant wavelength λ of the first solid-state light source. d1 With the dominant wavelength λ of the second solid-state light source d2 The package (which may include, for example, a surface mountable device (SMD)), such as an SMD 2835 LED package, includes an upper portion 346 and a base portion 348. The upper body portion 346 defines a recess 350 configured to receive solid-state light sources 330, 332. Package 344 may further include electrical connectors 352 and 354 on the outside of the base of package 344. Electrical connectors 352, 354 are electrically connected to electrode contact pads 356, 358, and 360 on the bottom surface of recess 350. Using adhesive or solder, solid-state light sources (LED chips) 330, 332 can be mounted to thermal pads 362 positioned on the bottom surface of recess 350. The electrode pads of the LED chips can be electrically connected to corresponding electrode contact pads 356, 358, and 360 on the bottom surface of package 344 using bonding wires 362. Alternatively, the LED chips can be flip-chip mounted in the package and electrically connected to the package. The notch 350 is filled with a light-transmitting optical encapsulant 364, typically optically transparent silicone, which contains a mixture of photoluminescent materials, such that the exposed surfaces of the LED chips 330, 332 are covered by the photoluminescent / silicone material mixture. To enhance the emission brightness of the device, the walls of the notch 350 may be tilted and have light-reflective surfaces. It will be understood, of course, that in other embodiments, one or more solid-state light sources (LED chips 330, 332) each generate light having the same (i.e., a single / individual) dominant wavelength and an FWHM of at least 25 nm.

[0070] Figure 3b This is another embodiment of the present invention. It is related to... Figure 3a Similarly, the difference lies in that the first and second narrowband solid-state light sources are replaced by two broadband blue LEDs 341a / 341b with active regions having multiple quantum wells. Typically, the first and second broadband blue solid-state light sources 341a / 341b each generate light with the same dominant wavelength λ. d Broadband blue excitation light.

[0071] Figure 4a and 4b This describes an embodiment of the on-board chip (COB) packaged full-spectrum white light-emitting device 410 according to an embodiment of the present invention, wherein... Figure 4a It is a plan view and Figure 4b This is a cross-sectional view through the BB. The device 410 can be configured to produce warm white light with a CCT (correlated color temperature) from 2500K to 5000K and a CRI (color rendering index) greater than 95.

[0072] Device 410 includes multiple (in) mounted in thermal communication with square MCPCB 468. Figure 4a In one example, there are twelve broadband blue solid-state excitation sources 420, such as broadband blue-emitting GaN (gallium nitride) based LED flip-chip dies.

[0073] like Figure 4a As indicated, the excitation source 420 can be configured as a generally circular array. The solid-state excitation sources (broadband LED dies) 420 can each generate excitation light having a dominant wavelength λd from 440 nm to 455 nm. In this embodiment, they have an FWHM (full width at half maximum) from 25 nm to 50 nm. Electrical contacts 472, 474 can be disposed on the top surface of the MCPCB 468 for operating the white light-emitting device 410. As shown, the broadband LED flip-chip die 420 is encapsulated with a transparent optical encapsulant 466 (e.g., silicone or epoxy material), which contains a mixture of photoluminescent materials, such that the exposed surface of the LED die 420 is covered by the photoluminescent / silicone material mixture. As shown, the transparent encapsulant / photoluminescent material mixture 466 can be contained within an annular wall 470. It will be understood, of course, that in other embodiments, Figure 4a and 4b The arrangement depicted may include a solid-state excitation source 420 consisting of two or more LEDs, rather than a single broadband InGaN / GaN blue LED with multiple quantum wells in the active region.

[0074] Green to yellow photoluminescent material

[0075] In this patent specification, green to yellow photoluminescent material refers to material that produces a peak emission wavelength (λ) in the green to yellow wavelength region of the visible spectrum, ranging from ~490 nm to ~570 nm. pe The photoluminescent material is a light-emitting material. Preferably, the green to yellow photoluminescent material has a broad emission characteristic and preferably has a wide FWHM (full width at half maximum) of ~100 nm or more. The green to yellow photoluminescent material can include any photoluminescent material, such as, for example, garnet-based inorganic phosphors, silicate phosphors, and oxynitride phosphors. Examples of suitable green to yellow phosphors are given in Table 1.

[0076] In some embodiments, green to yellow photoluminescent materials include the general composition Y3(Al,Ga)5O. 12Ce(YAG) activated yttrium aluminum garnet phosphors, such as the YAG series phosphors from Intermay Inc. in Fremont, California, USA, have peak emission wavelengths from 527 nm to 543 nm and a free wave size (FWHM) of ~120 nm. In this patent specification, the symbol YAG# indicates the phosphor type, i.e., a YAG-based phosphor, followed by the peak emission wavelength (#) in nanometers. For example, YAG535 indicates a YAG phosphor with a peak emission wavelength of 535 nm. Green to yellow photoluminescent materials may include the general composition (Y,Ba)3(Al,Ga)5O. 12 Ce(YAG) activated yttrium aluminum garnet phosphors, such as, for example, the GNYAG series phosphors from Intermay Inc. in Fremont, California, USA. In some embodiments, the green photoluminescent material may include the general composition Lu3Al5O 12 Ce(GAL) aluminate (LuAG) phosphors. Examples of such phosphors include, for example, the GAL series phosphors from Intermac Corporation, Fremont, California, USA, which have peak emission wavelengths from 516 nm to 560 nm and a FWHM of ~120 nm. In this patent specification, the symbol GAL# indicates the phosphor type (GAL), i.e., a LuAG-based phosphor, followed by the peak emission wavelength in nanometers (#). For example, GAL520 indicates a GAL phosphor with a peak emission wavelength of 520 nm.

[0077] Examples of green to yellow silicate phosphors include europium-activated orthosilicate phosphors of the general composition (Ba,Sr)2SiO4:Eu, such as the G, EG, Y and EY series phosphors from Intermay Inc. in Fremont, California, USA, which have peak emission wavelengths from 507 nm to 570 nm and FWHMs from ~70 nm to ~80 nm.

[0078] In some embodiments, the green to yellow phosphor may include a green-emitting oxynitride phosphor, as taught in U.S. Patent 8,679,367 entitled “Green-Emitting (Oxy) Nitride-Based Phosphors and Light Emitting Devices Using the Same,” the entire contents of which are incorporated herein by reference. This green-emitting oxynitride (ON) phosphor may have a general composition of Eu. 2+ :M 2+ Si4AlO x N (7-2x / 3) Where 0.1 ≤ x ≤ 1.0 and M 2+It is one or more divalent metals selected from the group consisting of Mg, Ca, Sr, Ba, and Zn. In this patent specification, the symbol ON# indicates the phosphor type (nitrogen oxide), followed by the peak emission wavelength (λ) in nanometers. pe ( )(#). For example, ON495 indicates a green nitride phosphor with a peak emission wavelength of 495 nm.

[0079]

[0080]

[0081] Orange to red photoluminescent material

[0082] Orange-to-red photoluminescent materials may include any orange-to-red photoluminescent material, typically a phosphor, which can be excited by blue light and is operable to emit a peak emission wavelength λ having a range from about 600 nm to about 670 nm. pe The phosphors may contain, for example, europium-activated silicon nitride phosphors, a-SiAlON, group IIA / IIB selenium sulfide phosphors, or silicate phosphors. Examples of orange to red phosphors are given in Table 2.

[0083] In some embodiments, europium-activated silicon nitride-based phosphors include those of the general formula CaAlSiN3:Eu 3+ Calcium aluminum silicon nitride phosphors (CAS N). CASN phosphors can be doped with the general formula (Sr,Ca)AlSiN3:Eu. 2+ Other elements, such as strontium (Sr). In this patent specification, the symbol CASN# indicates the phosphor type (CASN), followed by the peak emission wavelength (λ) in nanometers. pe ( )(#). For example, CAS N615 indicates an orange to red CASN phosphor with a peak emission wavelength of 615 nm.

[0084] In one embodiment, the orange-to-red phosphor may include an orange-to-red phosphor, as taught in U.S. Patent 8,597,545 entitled “Red-Emitting Nitride-Based Calcium-Stabilized Phosphors,” the entire contents of which are incorporated herein by reference. This red-emitting phosphor comprises phosphors derived from the chemical formula M… a Sr b Si c Al d N e Eu fA nitride-based composition represented by: M is Ca, and 0.1 ≤ a ≤ 0.4; 1.5 < b < 2.5; 4.0 ≤ c ≤ 5.0; 0.1 ≤ d ≤ 0.15; 7.5 < e < 8.5; and 0 < f < 0.1; where a + b + f > 2 + d / v and v is the valence of M.

[0085] Alternatively, the orange-to-red phosphor may include an orange-to-red light-emitting nitride-based phosphor, as taught in U.S. Patent US8,663,502, titled "Red-Emitting Nitride-Based Phosphors," the entire text of which is hereby incorporated by reference. This red-emitting phosphor includes a nitride-based composition represented by the chemical formula M (x / v) M’2Si 5-x Al x N8:RE, where: M is at least one monovalent, divalent, or trivalent metal having a valence v; M’ is at least one of Mg, Ca, Sr, Ba, Zn; and RE is at least one of Eu, Ce, Tb, Pr, and Mn; where x satisfies 0.1 ≤ x < 0.4, and where the red-emitting phosphor has the general crystal structure of M’2Si 5-x Al x N8:RE, with Al replacing Si within the general crystal structure, and M being substantially located at interstitial sites within the general crystal structure. An example of such a phosphor is the XR610 red nitride phosphor from Intematix Corporation of Fremont, California, USA, which has a peak emission wavelength of 610 nm.

[0086] The orange-to-red phosphor may also contain a IIA / IIB group selenium sulfide-based phosphor. The first example of a IIA / IIB group selenium sulfide-based phosphor material has the composition MSe 1-x S x: Eu, where M is at least one of Mg, Ca, Sr, Ba, and Zn and 0 < x < 1.0. Specific examples of such phosphor materials are CSS phosphors (CaSe1-xSx:Eu). Details of the CSS phosphors are provided in co-pending U.S. Patent Application Publication No. US2017 / 0145309, filed Sep. 30, 2016, the entire disclosure of which is hereby incorporated by reference. The CSS orange-to-red phosphors described in U.S. Patent Publication US2017 / 0145309 can be used in the present invention. The emission peak wavelength of the CSS phosphors can be tuned from 600 nm to 650 nm by changing the S / Se ratio in the composition and exhibits a narrow-band red emission spectrum with a FWHM from ~48 nm to ~60 nm (longer peak emission wavelengths generally have larger FWHM values). In this patent specification, the symbol CSS# represents the phosphor type (CSS) followed immediately by the peak emission wavelength (#) in nanometers. For example, CSS615 represents a CSS phosphor having a peak emission wavelength of 615 nm. To improve reliability, the CSS phosphor particles can be coated with one or more oxides, such as: aluminum oxide (Al2O3), silicon dioxide (SiO2), titanium dioxide (TiO2), zinc oxide (ZnO), magnesium oxide (MgO), zirconium oxide (ZrO2), boron oxide (B2O3), or chromium oxide (CrO). Alternatively and / or additionally, the narrow-band red phosphor particles can be coated with one or more fluorides, such as: calcium fluoride (CaF2), magnesium fluoride (MgF2), zinc fluoride (ZnF2), aluminum fluoride (AIF3), or titanium fluoride (TiF4). The coating can be a single layer or multiple layers having a combination of the foregoing coatings. The combined coating can be a coating having a sudden transition between the first and second materials, or can be a coating in which there is a gradual / smooth transition from the first material to the second material, thus forming a zone having a mixed composition that varies throughout the coating thickness.

[0087] In some embodiments, the orange-to-red phosphor can include an orange-emitting silicate-based phosphor, as taught in U.S. Patent US7,655,156, titled "Silicate-Based Orange Phosphors," the entire disclosure of which is hereby incorporated by reference. This orange-emitting silicate-based phosphor can have a general composition (Sr1-xMx)yEuzSiO5, where 0 < x ≤ 0.5, 2.6 ≤ y ≤ 3.3, 0.001 ≤ z ≤ 0.5, and M is one or more divalent metals selected from the group consisting of Ba, Mg, Ca, and Zn. In this patent specification, the symbol O# represents the phosphor type (orange silicate) followed immediately by the peak emission wavelength (λ pe )(#). For example, O600 represents an orange silicate phosphor having a peak emission wavelength of 600 nm.

[0088]

[0089]

[0090] 1800K to 6800K full spectrum white light emitting device

[0091] As described above, embodiments of the present invention relate to a full-spectrum white light-emitting device that produces light close to natural light, specifically but not exclusively in the blue to cyan wavelength region (430 nm to 520 nm) of the visible spectrum, where human non-visual perception, such as as measured by AF (circadian rhythm factor), is most affected. According to other aspects, the present invention relates to improving the efficiency of a full-spectrum white light-emitting device while maintaining a spectrum close to that of natural light in the wavelength range of about 430 nm to about 520 nm. The inventors have discovered that the efficiency of a full-spectrum white light-emitting device can be improved by optimizing (reducing) the intensity (photon count) of light corresponding to wavelengths in the red region of the spectrum, specifically reducing the intensity of light at wavelengths affecting the values ​​of CRI R9 ("saturated red") and CRI R8 ("red-violet"). This performance enhancement can be achieved by incorporating orange-to-red photoluminescent materials, the peak emission wavelength / FWHM of which is selected such that the device produces full-spectrum white light with an intensity roll-off (tail) in the orange-to-red wavelength region of the visible spectrum, the intensity roll-off decreasing (dropping) to half of its maximum intensity in wavelengths from about 645 nm to about 695 nm.

[0092] Figure 5 Demonstration: (A) Intensity spectra and normalized intensity I versus wavelength (nm) for the following three items: (i) a known full-spectrum light-emitting device using a narrowband excitation source – spectrum represented as A (dotted line); (ii) a full-spectrum light-emitting device using a broadband excitation source according to the present invention – spectrum represented as B (thin solid line); (iii) a blackbody curve (bbc) (dashed line) for the CCT of the nominally identical CCT to spectra A and B; and (B) circadian rhythm effect spectrum (CAS) – thick solid line, relative quantum sensitivity versus wavelength (nm). The figures define various parameters used in the patent specification and illustrate the principles of the invention.

[0093] refer to Figure 5 The circadian rhythm response spectrum (CAS) (also known as the spectral circadian rhythm efficacy function c(λ)) represents the human non-visual relative sensitivity to light. The maximum sensitivity of c(λ) occurs at a wavelength of 460 nm. CAS indicates that the 430 nm to 520 nm portion of the spectrum serves as the most effective wavelength for providing circadian rhythm input to regulate melatonin secretion.

[0094] Visually comparing spectrum A with the backbody curve (BBC), it will be noted that spectrum A exhibits a peak at 580, corresponding to excitation light generated by a narrow-band excitation source. The intensity of spectrum A deviates significantly from the intensity of the BBC (i.e., the peak intensity is much higher than that of the BBC at the same wavelength). In contrast, spectrum B exhibits two peaks at 582 and 584, corresponding to excitation light generated by a broadband excitation source. Compared to spectrum A, the intensity of spectrum B deviates only slightly from the intensity of the BBC (i.e., the peak intensity is slightly higher than that of the BBC at the same wavelength). It should be further noted that peak 580 occurs at a wavelength of 455 nm, i.e., close to the maximum sensitivity of CAS at a wavelength of 460 nm. Furthermore, it should be noted that spectrum A exhibits a valley (low point) at 586, and the minimum intensity of spectrum A deviates significantly from the minimum intensity of the BBC (i.e., the valley intensity is much lower than that of the BBC). In contrast, spectrum B exhibits a valley (low point) at 588, and compared to spectrum A, the minimum intensity of spectrum B deviates only slightly from the minimum intensity of the BBC (i.e., the valley intensity is slightly lower than that of the BBC). As can be seen from the figure, the smaller deviations of emission peaks 582 and 584 (compared to peak 584 in spectrum A) and valley 588 (compared to valley 586 in spectrum A) from the BBC indicate that spectrum B is closer to the BBC (Planck spectrum) in the wavelength range from 430 nm to 520 nm (blue to cyan). It will be further understood that spectrum B is closer to natural light in this wavelength region, where human non-visual perception, as measured by CAF (circadian rhythm factor), is most affected, and this can be beneficial to human well-being.

[0095] The metric used to quantify how closely a spectrum resembles a BBC is the maximum (maximum / largest) percentage intensity deviation (IL) of the light intensity compared to a BBC light source with the same correlated color temperature. maxdev That is, in the wavelength range from approximately 430 nm to 520 nm, I maxdev It is the maximum percentage intensity difference between the intensity of the spectrum and the intensity of the BBC. The maximum deviation can be positive (e.g., where the spectral intensity is greater than a peak of the BBC) or negative (e.g., where the spectral intensity is less than a valley of the BBC). For meaningful comparison of spectra, each spectrum is normalized to have the same CIE 1931XYZ relative luminance Y. The spectrum is normalized using the standard observer's photopic luminance function y(λ) (sometimes called the photopic or visual luminous efficiency function v(λ)), which takes into account the observer's photopic (visual) response and is for the same correlated color temperature. Therefore, I maxdev It is the maximum (greatest) percentage intensity difference between the normalized intensity of the spectrum and the normalized intensity of the BBC in the wavelength range of approximately 430 nm to 520 nm. maxdev Defined as:

[0096]

[0097] For example, refer to Figure 5 For spectrum A, the maximum deviation between the spectrum and the BBC corresponds to wavelength λ. maxdev The peak at λ = 455 nm is 580. The spectrum at λ... maxdev The intensity below is expressed as 590 and BBC at λ maxdev The intensity below is expressed as 592. Therefore, using the above calculations, spectrum A has a maximum percentage intensity deviation of 95% in the wavelength range from approximately 430 nm to approximately 520 nm. maxdev That is, under the maximum percentage intensity deviation, the spectrum A at wavelength λ maxdev The normalized intensity at the specified wavelength is 195% of the normalized intensity of the BBC at the same wavelength. In contrast, spectrum B has only a 30% maximum percentage intensity deviation. I maxdev (corresponding to peak 582), that is, the spectrum A at wavelength λ maxdev The normalized intensity at this wavelength is 130% of the normalized intensity of the BBC at this wavelength.

[0098] Roll-off wavelength λ RO The normalized intensity (I) is defined as the maximum intensity in the orange region of the spectrum (denoted as I). max) Reduced to half of its maximum strength (represented as 1 / 2I) max The wavelength on which the spectrum depends. As described above, the maximum intensity I of the spectrum in this wavelength region. ma x corresponds to the photoluminescent converted light, and the maximum intensity occurs at wavelengths longer than approximately 570 nm. For example, the maximum intensity may occur at wavelengths ranging from approximately 590 nm to approximately 620 nm.

[0099] Encapsulated white light emitting device test method

[0100] Encapsulated testing methods involve measuring encapsulated white light-emitting devices ( Figure 3a Total light emission in the integrating sphere.

[0101] Each of the encapsulated full-spectrum white light-emitting devices (Dev.#) according to the present invention includes a dominant wavelength λ. d1 =443nm, λ d2 =451nm and λ d3 = 457nm three 1133 (11mil×33mil) LED chips in a 2835 (2.8mm×3.5mm) SMD package.

[0102] In this specification, the following nomenclature is used to denote white light-emitting devices: Com.# indicates a comparative light-emitting device, wherein each excitation source includes one or more solid-state light sources with a single dominant wavelength, and Dev.# indicates a white light-emitting device according to an embodiment of the present invention, wherein each excitation source includes two solid-state light sources with different dominant wavelengths.

[0103] 2700K full spectrum white light emitting device test data

[0104] Tables 3, 4, and 5 present the measured optical test data of the 2700K white light-emitting devices Dev.1 and Dev.2, as well as the known CRI90 comparative device Com.1, and explain their impact on the effectiveness of reducing the red spectral content while maintaining the blue and cyan spectral content.

[0105] Light-emitting devices Dev.1 and Dev.2 each include a light source containing the dominant wavelength λ. d1 =443nm, λ d2 =451nm and λ d3 A 2835 package containing three LED chips with a wavelength of 457 nm. Dev.1 includes a combination of GAL520 and CASN650 phosphors, and Dev.2 includes a combination of GAL520, GAL530, CASN625, and CASN650 phosphors. The combination of CASN625 and CASN650 produces a peak emission of approximately 628 nm, wherein the wavelength depends on the relative ratio of CASN625 to CASN650. A comparative device, Com.1, includes a known 2835-packaged white light-emitting device utilizing a narrowband excitation source and having a nominal CRI Ra of 90.

[0106] Figure 6 The following four intensity spectra, normalized intensities (normalized to CIE 1931 XYZ relative brightness Y = 100) against wavelength (nm) are presented: (i) Dev.1 (solid line), (ii) Dev.2 (thick dashed line), (iii) Com.1 (dotted line), and (iv) Planck spectrum (thin dashed line) for a nominally identical 2700K CCT to Dev.1, Dev.2, and Com.1. For meaningful comparison of the spectra, each spectrum has been normalized to have a CIE 1931 XYZ relative brightness Y = 100. The data were normalized using the standard observer's CIE 1931 photometric function y(λ), which takes into account the observer's photopic response. Figure 6 The Planck spectrum (curve) or blackbody curve in the diagram represents the spectrum of a general CRI Ra equal to 100 for a given color temperature (CCT). Therefore, in order for a white light-emitting device with a given color temperature to have the highest possible color rendering, its emission spectrum should be as close as possible to the blackbody spectrum matching the same color temperature.

[0107] refer to Figure 6 It will be noted that, compared to the comparative device Com.1 (including a narrowband excitation source), the effect on the emission spectral energy content of the devices Dev.1 and Dev.2 (including a broadband excitation source) according to the invention is a significant reduction in the intensity of the blue emission peak 682 at approximately 430 nm and 440 nm, respectively. As can be seen from the figures, the reduction in the blue emission peak 682 of devices Dev.1 and Dev.2 (compared to peak 680 of Com.1) results in emission spectra closer to those similar to Planck spectra in the wavelength range of 430 nm to 520 nm (blue to cyan) (i.e., closer to those similar to natural sunlight). More specifically, spectral analysis indicates that, in the wavelength range of 430 nm to 520 nm (blue to cyan), there is a maximum percentage deviation of approximately 60% between the normalized intensity of the light emitted by devices Dev.1 and Dev.2 and the normalized intensity of the light from the blackbody curve (bb c) with the same correlated color temperature (2700 K). maxdev That is, Dev.1 and Dev.2 each produce light with 160% of the intensity of the BBC light at the same wavelength. The maximum deviations in normalized intensity occur at wavelengths λ of approximately 430 nm and approximately 440 nm, respectively. maxdev Below. This will be compared with a known comparator, Com.1, which utilizes a wavelength λ exhibited at approximately 450 nm. maxdev The maximum percentage deviation of the normalized intensity is approximately 80% below. maxdev A narrow-band excitation source of white light.

[0108] It will become clear that devices Dev.1 and Dev.2 thus produce white light that is closer to natural light in this wavelength range, where human non-visual perception, as measured by the CAF (circadian rhythm effect factor), is most affected, and this may be beneficial to human well-being. It is believed that this variation in spectral energy content, caused by the use of a broadband blue excitation source that at least partially fills the valleys in the cyan region of the spectrum and reduces peak overshoot in the blue region, explains the superior color rendering properties of the devices of the present invention. As can be seen from Table 3, devices Dev.1 and Dev.2 produce white light with CAFs within 1.9% and 0.8% of those of natural light, respectively (BBC for CCT2700K). In contrast, the comparative device Com.1 has a CAF within 3.8% of that of natural light.

[0109] The intensity roll-off (tail) of the spectrum in the orange to red wavelength region (i.e., for wavelengths longer than approximately 570 nm) is observed. For Dev.l, the maximum peak intensity (I...) maxDev.l) is approximately 8.2 and this occurs at a wavelength of approximately 640 nm. Intensity (I) is at a wavelength of approximately 690 nm (λ). RO Dev.1) drops to half of this value (1 / 2I) max Dev.l).

[0110] For Dev.2, the maximum peak intensity (I) max Dev.2) is approximately 7.6 and this occurs at a wavelength of approximately 620 nm. Intensity (I) is at a wavelength of approximately 675 nm (λ). RO Dev.2) drops to half of this value (1 / 2) Imax Dev.2).

[0111]

[0112]

[0113] Table 4

[0114]

[0115] Table 5

[0116]

[0117] Referring to Tables 3, 4, and 5, it should be noted that device Dev.1 has a power of 104 lm / W and produces white light with a CRI Ra greater than or equal to 95 (96.9), wherein each of CRI R1 to CRI R15 is 90 or higher (91.2 to 99.0). In contrast, device Dev.2 has a power of 119 lm / W and produces white light with a CRI Ra greater than or equal to 95 (95.8), wherein CRI R1 to CRI R7 and CRI R10 to CRI R15 are about 90 or higher (89.5 to 99.3), while CRI R8 (corresponding to "reddish-purple") is greater than 72 and less than 90 (86.6), and CRI R9 (corresponding to "saturated red") is greater than 50 and less than 90 (69.6). Furthermore, it should be noted that although the quality of light produced by Dev.2 is essentially the same as that of Dev.1, the efficiency is increased by approximately 15% (from 104 lm / W to 119 lm / W).

[0118] from Figure 6 As will be clear from Table 3, the performance increase of Dev.2 compared to Dev.1 is a direct result of the spectral roll-off of Dev.2 at a shorter wavelength (675 nm) than that of Dev.1 (690 nm), which reduces the light intensity in the red wavelength region of the spectrum.

[0119] 3000K full spectrum white light emitting device test data

[0120] Tables 6, 7, and 8 present the measured optical test data of the 3000K white light-emitting devices Dev.3 to Dev.5 and the known 3000K CRI 90 and CRI 80 comparative devices Com.2 and Com.3, respectively, and illustrate their impact on the effectiveness of reducing the red spectral content while maintaining the blue and cyan spectral content.

[0121] The light-emitting devices Dev.3 to Dev.5 each include a light source containing the dominant wavelength λ. d1 =443nm, λ d2 =451nm and λ d1 =457nm 2835 package of three LED chips. Dev.3 includes a combination of GAL520 and CASN650 phosphors, while devices Dev.4 and Dev.5 include a combination of GAL520, GAL530, CASN625, and CASN650 phosphors, wherein Dev.5 includes a larger relative portion of CASN625 to CASN650 than Dev.4 (the combination of CASN625 and CASN650 in Dev.4 produces a peak emission of approximately 625nm and the combination in Dev.5 produces a peak emission of approximately 628nm). Comparative device Com.2 includes a known 2835 packaged white light-emitting device using a narrowband excitation source and having a nominal CRI Ra of 90. Com.3 includes a known 2835 packaged white light-emitting device using a narrowband excitation source and having a nominal CRI Ra of 80.

[0122] Figure 7a Show the intensity spectra, normalized intensity (normalized to CIE1931XYZ relative brightness Y=100) against wavelength (nm) for the following five items: (i) Dev.3 (solid line), (ii) Dev.4 (thick dashed line), (iii) Dev.5 (dotted line), (iv) Com.2 (dotted line), and (v) Planck spectrum or blackbody curve (thin dashed line) for a CCT of the same nominal value as Dev.3, Dev.4, Dev.5, and Com.2 at 3000K. Figure 7b The following are emission spectra, normalized intensities (normalized to CIE 1931XYZ relative brightness Y = 100) against wavelength (nm): (i) Dev.4 (solid line), (ii) Com.2 (dotted line), and (iii) Planck spectrum (dashed line) for a CCT of 3000K that is nominally the same as Dev.4 and Com.2. Figure 7cThe following three emission spectra, normalized intensity (normalized to CIE 1931XYZ relative luminance Y = 100) versus wavelength (nm): (i) Dev.5 (solid line), (ii) Com.3 (dotted line), and (iii) Planck spectrum (dashed line) for a CCT of the same nominal 3000K as Dev.5 and Com.3. Spectral analysis indicates that, within the wavelength range of 430nm to 520nm (blue to cyan), there are maximum percentage deviations of normalized intensity I between the normalized intensity of light emitted by devices Dev.3, Dev.4, and Dev.5 and the normalized intensity of light from a blackbody curve with the same correlated color temperature (3000K), at approximately 40%, 50%, and 60%, respectively. maxdev This will be compared with known comparability devices Com.2 and Com.3, which utilize the maximum percentage deviation I that generates normalized intensity, respectively, to show approximately 70% and 100%. maxdev A narrow-band excitation source of white light (at a wavelength of approximately 450 nm). Furthermore, as can be seen from Table 6, devices Dev.3, Dev.4, and Dev.5 produce white light with a CAF (calculated area of ​​free light) within 3.4%, 4.1%, and 3.4% of that of natural light (BBC for CCT3000K). In contrast, comparative devices Com.2 and Com.3 have CAFs within only 11.5% and 9.5% of that of natural light, respectively.

[0123] It will become clear that each of devices Dev.3, Dev.4, and Dev.5 thus produces white light that is closer to natural light in this wavelength range, in which human non-visual perception, as measured by CAF (circadian rhythm factor) or melanops ...

[0124] The intensity roll-off (tail) of the spectrum in the orange to red wavelength region (i.e., for wavelengths longer than approximately 570 nm) is observed. For Dev.3, the maximum peak intensity (I...) max Dev.3) is approximately 7.3 and this occurs at a wavelength of approximately 630 nm. Intensity (I) is at a wavelength of approximately 690 nm (λ). RO Dev.3) drops to half of this value (1 / 2I) max Dev.3).

[0125] For Dev.4, the maximum peak intensity (I) max Dev.4) is approximately 6.8 and this occurs at a wavelength of approximately 625 nm. Intensity (I) is at a wavelength of approximately 680 nm (λ). RO Dev.4) drops to half of this value (1 / 2I) max Dev.4).

[0126] For Dev.5, the maximum peak intensity (I) max Dev.5) is approximately 7.0 and this occurs at a wavelength of approximately 605 nm. Intensity (I) is at a wavelength of approximately 650 nm (λ). RO Dev.5) drops to half of this value (1 / 2I) max Dev.5).

[0127]

[0128] Table 7

[0129]

[0130] Table 8

[0131]

[0132]

[0133] Referring to Tables 6, 7, and 8, it should be noted that device Dev.3 has a power of 109 lm / W and produces white light with a CRI Ra greater than 95 (95.9), wherein each of CRI R1 to CRI R15 is 90 or higher (91.8 to 99.3). In contrast, device Dev.4 has a power of 149 lm / W and produces white light with a CRI Ra greater than 95 (95.6), wherein each of CRI R1 to CRI R8 and CRI R10 to CRI R15 is 90 or higher, while CRI R9 (corresponding to "saturated red") is greater than 50 and less than 90 (77.8). In comparison, device Dev.5 has an efficiency of 120 lm / W and produces white light with a CRI Ra greater than or equal to 85 (85.0), wherein each of CRI R1 to CRI R7 and CRI R10 to CRI R15 is 90 or higher, while CRI R8 (corresponding to "reddish-violet") is less than 72 (60.0), and CRI R9 (corresponding to "saturated red") is greater than 10 and less than 90 (11.9). Furthermore, it should be noted that although the light quality produced by Dev.4 and Dev.5 is substantially the same as that of Dev.3, the efficiency is increased by approximately 20% and 50%, respectively.

[0134] 4000K full spectrum white light emitting device test data

[0135] Tables 9, 10, and 11 present the measured optical test data for the 4000K white light-emitting device Dev.6 and the known 4000K CRI90 comparative device Com.4. The light-emitting device Dev.6 includes devices containing the dominant wavelength λ. d1 =443nm, λ d2=451nm and λ d1 The device is a 2835 package containing three LED chips with a wavelength of 457nm and includes a combination of GAL520 and CASN650 phosphors. A comparative device, Com.4, includes a known 2835-packaged white light-emitting device utilizing a narrow-band excitation source and having a nominal CRI Ra of 90.

[0136] Figure 8 The following three intensity spectra, normalized intensity (normalized to CIE 1931XYZ relative brightness Y = 100) versus wavelength (nm) are shown: (i) Dev.6 (solid line), (ii) Com.4 (dotted line), and (v) Planck spectrum (dashed line) for a CCT nominally identical to Dev.6 and Com.3 at 4000K. Spectral analysis indicates a maximum percentage deviation of approximately 30% of the normalized intensity within the wavelength range of 430 nm to 520 nm (blue to cyan). maxdev That is, the maximum difference between the normalized intensity of the light emitted by device Dev.6 and the normalized intensity of light from a blackbody curve (BBC) with the same correlated color temperature (4000K). This will be compared with a known comparator, Com.2, which utilizes a maximum percentage deviation I that exhibits approximately 90% of the normalized intensity. maxdev A narrow-band excitation source of white light (at a wavelength of approximately 450 nm). Furthermore, as can be seen from Table 6, the Dev.6 device produces white light with a CAF of 0.4% (for CCT4000K BBC), which is equal to that of natural light. In contrast, the comparative device Com.3 has a CAF of only less than 7.0% of that of natural light.

[0137] It will become clear that the device Dev.6 produces white light that is closer to natural light in this wavelength range, in which human non-visual perception, as measured by CAF (circadian rhythm factor) or melanops ...

[0138] The intensity roll-off (tail) of the spectrum in the orange to red wavelength region (i.e., for wavelengths longer than approximately 570 nm) is observed. For Dev.6, the maximum peak intensity (I...) max Dev.6) is approximately 5.9 and this occurs at a wavelength of approximately 630 nm. Intensity (I) is at a wavelength of approximately 685 nm (λ). RO Dev.6) drops to half of this value (1 / 2I) max Dev.6).

[0139]

[0140]

[0141] Table 10

[0142]

[0143] Table 11

[0144]

[0145] Referring to Tables 9, 10 and 11, it should be noted that the device Dev.6 has a power of 117 lm / W and produces white light with a CRIRa greater than 95 (95.9), wherein each of CRI R1 to CRI R15 is 90 or higher (91.8 to 99.3).

[0146] 5000K full spectrum white light emitting device test data

[0147] Tables 12, 13, and 14 present the measured optical test data of the 5000K white light-emitting devices Dev.7 and Dev.8, and the known 5000K CRI 90 and CRI 80 comparative devices Com.5 and Com.6, respectively, and illustrate their impact on the effectiveness of reducing the red spectral content while maintaining the blue and cyan spectral content.

[0148] The light-emitting devices Dev.7 and Dev.8 each include a light source containing the dominant wavelength λ. d1 =443nm, λ d2 =451nm and λ d1 Device Dev.7 comprises a 2835 package with three LED chips at 457nm. Device Dev.8 comprises a combination of GAL520 and CASN650 phosphors, while device Dev.8 comprises a combination of GAL520, GAL530, CASN625, and CASN650 phosphors. Comparative device Com.5 comprises a known 2835-packaged white light-emitting device utilizing a narrowband excitation source and having a nominal CRI Ra of 90%. Com.6 comprises a known 2835-packaged white light-emitting device utilizing a narrowband excitation source and having a nominal CRI Ra of 80.

[0149] Figure 9a The following three items are shown with their intensity spectra, normalized intensity (normalized to CIE 1931XYZ relative luminance Y = 100) against wavelength (nm): (i) Dev.7 (solid line), (ii) Com.5 (dotted line), and (iii) Planck spectrum (dashed line) for a CCT of the same nominal 5000K as Dev.7 and Com.5. Spectral analysis indicates a maximum percentage deviation of approximately 50% between the normalized intensity of light emitted by device Dev.7 and the normalized intensity of light from a CIE standard luminescent body D with the same correlated color temperature (5000K) in the wavelength range of 430nm to 520nm (blue to cyan).maxdev This will be compared to the known comparability device Com.5, which utilizes a maximum percentage deviation I that exhibits a normalized intensity of approximately 115%. maxdev( A narrowband excitation source of white light (at a wavelength of approximately 450 nm, λmax dev). Furthermore, as can be seen from Table 12, device Dev.7 produces white light with a CAF within 2.1% of that of natural light (for CIED of CCT5000K). In contrast, the comparative device Com.5 has a CAF within only 12.6% of that of natural light.

[0150] Figure 9b The following three items are shown with their intensity spectra, normalized intensity (normalized to CIE 1931XYZ relative luminance Y = 100) against wavelength (nm): (i) Dev.8 (solid line), (ii) Com.6 (dotted line), and (iii) Planck spectrum (dashed line) for a CCT of the same nominal 5000K as Dev.8 and Com.6. Spectral analysis indicates a maximum percentage deviation of approximately 20% between the normalized intensity of light emitted by device Dev.8 and the normalized intensity of light from a CIE standard luminescent body D with the same correlated color temperature (5000K) in the wavelength range of 430nm to 520nm (blue to cyan). maxdev This will be compared to the known comparator Com.6, which utilizes a generator exhibiting a maximum percentage normalized intensity deviation of approximately 140% (at a wavelength λ of approximately 450 nm). maxdev The device Dev.8 is a narrow-band excitation source for white light (below). Furthermore, as can be seen from Table 12, the device Dev.8 produces white light with a CAF of less than 2.0% of that of natural light (for the CCT5000K CIED). In contrast, the comparative device Com.6 has a CAF of only less than 13.1% of that of natural light.

[0151] It will become clear that each of the devices Dev.7 and Dev.8 produces white light that is closer to natural light in this wavelength range, in which human non-visual perception, as measured by CAF (circadian rhythm factor) or melanops ...

[0152] The intensity roll-off (tail) of the spectrum in the orange to red wavelength region (i.e., for wavelengths longer than approximately 570 nm) is observed. For Dev.7, the maximum peak intensity (I...) max Dev.7) is approximately 4.9 and this occurs at a wavelength of approximately 625 nm. Intensity (I) is at a wavelength of approximately 685 nm (λ). RO Dev.7) drops to half of this value (1 / 2I)max Dev.7).

[0153] For Dev.8, the maximum peak intensity (I) max Dev.8) is approximately 5.6 and this occurs at a wavelength of approximately 590 nm. Intensity (I) is at a wavelength of approximately 650 nm (λ). RO Dev.8) drops to half of this value (1 / 2I) max Dev.8)

[0154]

[0155] Table 13

[0156]

[0157]

[0158] Table 14

[0159]

[0160] Referring to Tables 12, 13, and 14, it should be noted that device Dev.7 has an efficiency of 117 lm / W and produces white light with a CRI Ra greater than 95 (98.5), wherein each of CRI R1 to CRI R15 is 90 or higher (93.5 to 99.0). In contrast, device Dev.8 has an efficiency of 152 lm / W and produces white light with a CRI Ra greater than 80 (83.9), while CRI R8 (corresponding to "reddish-purple") is less than 72 (62.6), and CRI R9 (corresponding to "saturated red") is greater than zero and less than 90 (1.3). Furthermore, it should be noted that although the quality of light produced by Dev.8 is substantially the same as that of Dev.7, the efficiency increase is substantially approximately 30% and comparable to Com.6.

[0161] LED filament white light emitting device

[0162] Although embodiments of the white light-emitting device according to the present invention have been described with reference to remote phosphors and encapsulated white light-emitting devices, it will be understood that the category of white light-emitting devices encompasses LED filament white light-emitting devices. Tests have confirmed that white light-emitting devices in the form of LED filaments according to embodiments of the present invention have similar spectral characteristics and provide the same benefits and advantages as the white light-emitting devices described above.

[0163] Figure 10This illustration shows a side view of an LED filament A-series lamp (bulb) 10100 used to generate full-spectrum white light with a CCT (correlated color temperature) in the range of 1800K to 6800K. According to the present invention, the LED filament lamp 10100 includes a connector substrate 10102, a light-transmitting glass tube 10104, a glass LED filament support (rod) 10106, and four LED filaments (white light-emitting devices) 1010.

[0164] Now for reference Figure 11a and 11b The LED filament 1110 according to an embodiment of the present invention is described. Figure 11a and 11b The diagram shows a cross-sectional side view through the cathode ray tube (CC) and a partially cross-sectional plan view of the LED filament. The LED filament 1110 may include a light-transmitting circuit board (substrate) 11108 having an array of solid-state broadband excitation sources 1120 mounted on the front side 11110. The broadband excitation sources are configured to generate a dominant wavelength λ having a range from 420 nm to 470 nm. d That is, broadband blue excitation light in the blue wavelength region of the visible spectrum having an FWHM from 25 nm to 50 nm. In the illustrated embodiment, the broadband excitation source 1120 is composed of an unpackaged broadband blue LED die (e.g., an MQWInGaN / GaN LED die described herein) directly mounted to a substrate. In other embodiments, each of the broadband excitation sources 1120 may be composed of a light source with a different dominant wavelength λ directly mounted to a substrate. d1 , λ d2 It consists of a combination of at least two narrowband blue LED wafers.

[0165] In the illustrated embodiment, the substrate 11108 is planar and has an elongated form (strip), wherein the broadband excitation sources 1120 are configured as a linear array along the length of the front side 11110 of the substrate.

[0166] Typically, each LED filament may include 25 excitation sources (LED dies) with a total nominal power of approximately 2W.

[0167] Preferably, the at least semi-transparent substrate 11108 may comprise any light-transmitting material with a transmittance of 10% or greater to visible light, such as, for example, glass or plastic materials, such as polypropylene, silicone, or acrylic resin. The substrate 11108 may further include conductive rails 11112 on its front side 11110, configured for electrical connection to a desired circuit arrangement of the excitation source 1120. As illustrated, the excitation sources 1120 may be electrically connected in series. As shown, the excitation sources 1120 may be electrically connected to the conductive rails 11112 using bonding wires 11114. In other embodiments, the excitation sources 1120 may be directly connected to each other via bonding wires, thereby eliminating the need for conductive rails. In yet another embodiment, the excitation source 1120 may include surface-mountable or flip-chip LEDs mounted to the conductive rails. The substrate 11108 may include electrodes 11116 at corresponding ends for applying power to the LED filament 1110.

[0168] According to an embodiment of the present invention, the LED filament 1110 further includes a photoluminescent wavelength conversion material 1166 covering at least the front side 11110 of the substrate and the excitation source 1120. According to an embodiment of the present invention, the photoluminescent wavelength conversion material 1166 includes a combination of green to yellow photoluminescent materials and optionally orange to red photoluminescent materials. To ensure that the light emitted from the front and back of the LED filament is substantially the same color, the LED filament 1110 may further include a photoluminescent wavelength conversion material 11118 covering the back side 11120 of the substrate, as shown. The photoluminescent wavelength conversion material 11118 may include the same photoluminescent material as the photoluminescent wavelength conversion material 1166.

[0169] As described above, a particular advantage of the present invention is that the full-spectrum white light-emitting device according to embodiments of the invention can produce full-spectrum light close to natural light in the blue to cyan wavelength region (430 nm to 520 nm) similar to the spectrum, where human non-visual perception, as measured by CAF (circadian rhythm factor) or melanopsin ratio (MR), is most affected. The lighting industry has extensively discussed blue light stimulation and its effects on circadian rhythms. The amount of blue to cyan light in a light source affects melatonin secretion, which can influence the circadian rhythm cycle. High levels of blue to cyan light suppress melatonin secretion, thus energizing the body. Low levels of blue light do not suppress melatonin secretion, thus relaxing the body. One indicator used to estimate this non-visual effect is the CAF, which is typically modulated by the amount of blue light throughout the day. At noon, the sun has a high CCT and a relatively high blue to cyan light content. Sunrise and sunset have lower CCTs and lower blue to cyan light content. The CAF value of natural light under different CCTs is a good measure of the illumination deviation of natural light in the blue to cyan region, where human emotions, health, or well-being are affected.

[0170] Furthermore, a further advantage of the full-spectrum white light-emitting device of the present invention is that, through appropriate selection of the peak emission wavelength / FWHM of the orange-to-red photoluminescent material, the device produces white light with a spectrum having a roll-off (tail) in the orange-to-red wavelength region, wherein the intensity decreases from its maximum value in the orange-to-red wavelength region of the spectrum to about 50% of that maximum value at wavelengths from about 645 nm to about 695 nm. This spectral characteristic (tail) reduces the light intensity (photon count) in the red wavelength region of the spectrum, at which the visual response of the eye is low and thus increases the device's efficiency. Test data have confirmed that the full-spectrum white light-emitting device according to the present invention can produce white light with a CRI Ra of at least 90 and efficiency equal to or exceeding that of known CRI 80 devices, while having only reductions in CRI R9 and CRI R8. Despite this reduction in the values ​​of CRI R9 and CRI R8, the perceived quality of the light produced by the device is not adversely affected due to the sensitivity of the eye in the red wavelength region of the spectrum.

[0171] In summary, it will be understood that the embodiment of the light-emitting device according to the present invention, including a broadband solid-state excitation source, achieves the production of a full-spectrum white light-emitting device having white light characteristics in the range of 1800K to 6800K by one or more of the following conditions: (i) the maximum percentage intensity deviation of the white light from the light of a blackbody curve or CIE standard luminescent material D with the same correlated color temperature is less than at least one of 60%, 50%, 40%, 30%, 20%, and 10% in the wavelength range from about 430 nm to about 520 nm; (ii) the spectrum has a CAF within 5%, 4%, 2%, or 1% of the blackbody curve / CIE standard luminescent material D; (iii) CRI R9 and / or CRI (iv) The intensity of the spectrum decreases from its maximum value in the orange to red wavelength region of the spectrum to about 50% of the maximum value at wavelengths from about 645 nm to about 695 nm; (v) The intensity of the spectrum decreases from its maximum value in the orange to red wavelength region of the spectrum to about 50% of the maximum value at wavelengths from about 645 nm to about 695 nm and has a CRI Ra greater than or equal to 85, CRI R1 to CRI R7 and CRI R10 to CRI R15 greater than or equal to 90, CRI R8 less than 72, and CRI R9 greater than 10 and less than 90; (vi) The intensity of the spectrum decreases from its maximum value in the orange to red wavelength region of the spectrum to about 50% of the maximum value at wavelengths from about 645 nm to about 695 nm and has a CRI Ra greater than or equal to 95, CRI R1 to CRI R8 and CRI R10 to CRI R15 greater than or equal to 90, and CRI R9 greater than 50 and less than 90. R9, and (vii) the intensity of the spectrum decreases from its maximum value in the orange to red region of the spectrum to about 50% of the maximum value at wavelengths ranging from about 645 nm to about 695 nm and has a CRI Ra greater than or equal to 95 and CRI R1 to CRI R15 greater than or equal to 90.

[0172] Although the invention has been described in detail, it will be apparent to those skilled in the art that various changes and modifications and equivalents may be made without departing from the invention. It should be understood that the invention is not limited to the construction details, component arrangements, and / or methods set forth in the foregoing description or illustrated in the drawings. Furthermore, the figures are merely exemplary and not limiting. Titles and subtitles are provided for the reader's convenience only. They should not and cannot be construed as having any substantial meaning, connotation, or interpretation, nor should they be considered as indicating that all information relating to any particular subject matter will be found under or limited to any particular title or subtitle. Therefore, the invention should not be bound or limited except as provided in the following claims and their legal equivalents. While the invention has been specifically described with reference to certain embodiments thereof, it will be readily apparent to those skilled in the art that changes and modifications in form and detail may be made without departing from the spirit and scope of the invention.

[0173] Although the present invention has been specifically described with reference to certain embodiments thereof, it will be readily apparent to those skilled in the art that changes and modifications in form and detail may be made without departing from the spirit and scope of the invention.

Claims

1. A full-spectrum light-emitting device, characterized in that, include: A solid-state light source is used to generate excitation light with a dominant wavelength in the range of 420nm to 480nm, wherein the excitation light is composed of light emission from multiple different dominant wavelengths; Photoluminescent materials are used to generate light with peak emission wavelengths in the range of 490 nm to 680 nm. The device is used to generate light with a spectrum; the maximum percentage intensity deviation of the light from the blackbody curve or CIE standard light emitter D is less than 60% in the wavelength range of 430 nm to 520 nm.

2. The full-spectrum light-emitting device according to claim 1, characterized in that, The solid-state light source includes multiple LEDs, each of which is used to generate light emission from one of multiple different dominant wavelengths.

3. The full-spectrum light-emitting device according to claim 1, characterized in that, The solid-state light source includes an LED, the active region of which has multiple quantum wells of different wavelengths, and the LED is used to generate light emission of multiple different dominant wavelengths.

4. The full-spectrum light-emitting device according to any one of claims 1-3, characterized in that, The solid-state light source is used to generate excitation light with an FWHM of at least 25 nm.

5. The full-spectrum light-emitting device according to any one of claims 1-3, characterized in that, The solid-state light source is used to generate excitation light with an FWHM of at least 30 nm.

6. The full-spectrum light-emitting device according to any one of claims 1-3, characterized in that, The solid-state light source is used to generate excitation light with an FWHM of at least 50 nm.

7. The full-spectrum light-emitting device according to any one of claims 1-3, characterized in that, The solid-state light source is used to generate excitation light with an FWHM ranging from 30 nm to 70 nm.

8. The full-spectrum light-emitting device according to any one of claims 1-3, characterized in that, The device is used to generate light with correlated color temperatures ranging from 2700K to 6800K.

9. The full-spectrum light-emitting device according to any one of claims 1-3, characterized in that, The device is used to generate light with a CRI Ra of at least 90 or at least 95.

10. The full-spectrum light-emitting device according to any one of claims 1-3, characterized in that, The device is used to generate light with a CRI R9 of greater than 10 and less than 90 or greater than 50 and less than 90.

11. The full-spectrum light-emitting device according to any one of claims 1-3, characterized in that, The device is used to generate light with a CRI R8 of less than 90 or less than 72.

12. The full-spectrum light-emitting device according to any one of claims 1-3, characterized in that, The device is used to generate light of at least 80 CRI R8 and has an efficiency of at least 102 lm / W.

13. The full-spectrum light-emitting device according to any one of claims 1-3, characterized in that, The device is one of surface mount technology, onboard chip packaging, and filament.

14. A full-spectrum white light emitting device, characterized in that, include: A solid-state excitation source for generating excitation light with a dominant wavelength from 420 nm to 480 nm, the excitation light consisting of light emission from multiple different dominant wavelengths; Photoluminescent materials, used to generate light with peak emission wavelengths from 490 nm to 680 nm; The device is used to generate light with a circadian rhythm factor (CAF) within 5% of the circadian rhythm factor of the blackbody curve or the CIE standard luminescent body D.

15. The full-spectrum white light emitting device according to claim 14, characterized in that, The solid-state light source includes multiple LEDs, each of which is used to generate light emission from one of multiple different dominant wavelengths.

16. The full-spectrum white light emitting device according to claim 14, characterized in that, The solid-state light source includes an LED, the active region of which has multiple quantum wells of different wavelengths, and the LED is used to generate light emission of multiple different dominant wavelengths.

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