LED filament lamp

Abstract

An LED filament lamp 1 that provides LED filament lamp light during operation is an LED filament 21-24 that emits LED filament light during operation, the LED filaments 21-24 including a plurality of LEDs 3-6 that emit LED light during operation and are arranged on elongated supports 7-10, and elongated encapsulants 11-14 that cover the plurality of LEDs 3-6 and at least a portion of the elongated supports 7-10, the elongated encapsulants 11-14 including a first luminescent material 38 that is configured to convert at least a portion of the LED light into converted light, and / or a light-scattering material 39 that is configured to scatter at least a portion of the LED light into scattered light; and a socket 51 of a lighting fixture 50 that electrically and mechanically connects the LED filament lamp 1 to the socket 51. and a translucent envelope 15 at least partially surrounding the LED filaments 21-24 and attached to the base 17, the translucent envelope 15 including a second luminescent material 37, the second luminescent material 37 including one or more of an organic phosphor 41 and quantum dots 42 dispersed in a polymer matrix 40, the second luminescent material 37 configured to convert a portion of the LED filament light to converted LED filament light, the second luminescent material 37 having absorption in a visible wavelength range, at least 80% of the visible wavelength range being within the blue and green wavelength ranges, such that the translucent envelope 15 is perceived as having an amber color.

Description

Technical Field

[0001] The present invention relates to an LED filament lamp that supplies LED filament lamp light during operation, and an LED filament that emits LED filament light during operation. The LED filament lamp has an LED filament that emits LED light during operation, includes a plurality of LEDs disposed on an elongated support (carrier), and an elongated encapsulant that covers at least a part of the plurality of LEDs and the elongated support.

[0002] It should be noted that the terms "blue" and "blue wavelength range" as used herein relate particularly to light having a wavelength within the range of about 430 to 495 nm (including some purple and cyan hues). The terms "green" and "green wavelength range" relate particularly to light having a wavelength within the range of about 495 to 560 nm. The terms "yellow" and "yellow wavelength range" relate particularly to light having a wavelength within the range of about 560 to 590 nm. The terms "orange" and "orange wavelength range" relate particularly to light having a wavelength within the range of about 590 to 620 nm. The terms "red" and "red wavelength range" relate particularly to light having a wavelength within the range of about 620 to 780 nm. The term "amber" may refer to one or more wavelengths selected from the range of about 580 to 605 nm, such as about 590 to 600 nm. The term "visible wavelength range" is intended to refer to the wavelength range of 400 to 800 nm.

Background Art

[0003] The trend in lighting is the LED filament lamp. The LED filament lamp is an LED lamp designed to resemble a conventional incandescent bulb that has a visible filament for aesthetic and light distribution purposes, but includes highly efficient light-emitting diodes.

[0004] The LED filament supplies LED filament light and has a plurality of light-emitting diodes (LEDs) arranged in a linear array. Preferably, the LED filament has a length L and a width W, where L > 5W. The LED filament may be arranged in a linear configuration, or in a non-linear configuration, such as a curved configuration, a 2D / 3D spiral, or a helix. Preferably, the LEDs are arranged on an elongated support, such as a support that may be rigid (for example, made from polymer, glass, quartz, metal, or sapphire) or flexible (for example, made from a film or foil of polymer or metal).

[0005] If the support has a first main surface and a second main surface on the opposite side, the LED is disposed on at least one of these surfaces. The support may be reflective, or it may be translucent, preferably transparent, or otherwise light-transmitting.

[0006] The terms "support" and "elongated support" as used herein may be used interchangeably, such that "elongated support" may also be simply referred to as "support."

[0007] The LED filament may have a encapsulant that at least partially covers at least some of the multiple LEDs. The encapsulant may also at least partially cover at least one of the first and second main surfaces. The encapsulant may be a flexible polymer material, such as silicone. Furthermore, the LEDs may be configured to emit LED light of different colors or spectra, for example. The encapsulant may have a luminescent material configured to convert at least some of the LED light into converted light. The luminescent material may be a phosphor such as an inorganic phosphor, and / or quantum dots or rods (further referred to as QDs).

[0008] The LED filament may have multiple subfilaments.

[0009] WO 2020 / 161070 A1 discloses an LED filament lamp having an LED filament configured to emit LED filament light and an envelope containing a light-absorbing material configured to absorb light in the wavelength range of 400 to 440 nm to provide an amber appearance. The envelope at least partially surrounds the LED filament of the LED filament lamp. The light-absorbing material is transparent to substantially all visible LED filament light having wavelengths longer than 440 nm. The LED filament may further have a luminescent material provided within a encapsulant surrounding the LED strip.

[0010] Many of these LED filament lamps have an amber coating on their envelope to give them a vintage or nostalgic look. However, the amber coating absorbs the light from the LED filament.

[0011] Therefore, in LED filament lamps, and especially in LED filament lamps configured to have a vintage or nostalgic appearance, there is a desire to improve the performance and / or appearance of the LED filament.

[0012] US 2022 / 078892 discloses an LED bulb having a lamp housing and a bulb base connected to the lamp housing, wherein the spectral distribution of the bulb is generally in the wavelength range of approximately 400 nm to 800 nm, and three peak wavelengths P1, P2 and P3 appear within the wavelength range corresponding to the light emitted by the bulb, with the wavelength of peak P1 being between 430 nm and 480 nm, the wavelength of peak P2 being between 480 nm and 530 nm, and the wavelength of peak P3 being between 630 nm and 680 nm. [Overview of the project] [Problems that the invention aims to solve]

[0013] The object of the present invention is to solve this problem and to provide an LED filament lamp, wherein such an LED filament lamp, in particular configured to have a vintage or nostalgic appearance, is equipped with an LED filament of improved performance and / or appearance. [Means for solving the problem]

[0014] According to a first aspect of the present invention, this and other objects include an LED filament lamp that supplies LED filament lamp light during operation, an LED filament that emits LED filament light during operation, a plurality of LEDs that emit LED light during operation and are arranged on an elongated support, and an elongated encapsulant that covers the plurality of LEDs and at least a portion of the elongated support, wherein the elongated encapsulant comprises at least one of a first luminescent material configured to convert at least a portion of the LED light into converted light, and a light scattering material configured to scatter at least a portion of the LED light into scattered light, wherein the LED filament light comprises the converted light and / or the scattered light, and the LED filament lamp is electrically and mechanically connected to a socket of a lighting fixture. An LED filament lamp having a base configured to be connected to the LED filament and a translucent envelope that at least partially surrounds the LED filament and is attached to the base, wherein the translucent envelope comprises a second luminescent material, the second luminescent material comprises one or more organic phosphors and quantum dots dispersed in a polymer matrix, the second luminescent material is configured to convert a portion of the LED filament light into converted LED filament light, and the second luminescent material is absorbent in the visible wavelength range, where at least 80% of the visible wavelength range is in the blue and green wavelength range, so that the translucent envelope is perceived to have an amber color.

[0015] This provides an LED filament lamp in which, in particular, by providing the second luminescent material to the translucent envelope as described above, light loss in the translucent envelope is reduced, and furthermore, the performance and / or appearance of the LED filament in such an LED filament lamp is improved. Note that the word "translucent" also includes transparent. Such an LED filament lamp also has a vintage or nostalgic look that functions particularly well.

[0016] In embodiments, the second luminescent material may be absorbent in the visible wavelength range, where at least 85%, preferably at least 90%, more preferably at least 93%, and most preferably at least 95% of the visible wavelength range is within the blue and green wavelength range, such that the translucent envelope is perceived to have an amber color.

[0017] The absorption rate of the second luminescent material in the visible wavelength range may be higher in the blue wavelength range than in the green wavelength range.

[0018] It should be noted that this embodiment applies when the second luminescent material is or contains quantum dots dispersed in a polymer matrix. This provides an LED filament lamp having an improved appearance when the LED filament is off and does not emit LED filament light.

[0019] The second luminescent material may have absorbency in the visible wavelength range, wherein at least 55%, preferably at least 58%, more preferably at least 60% of the visible wavelength range is in the green wavelength range, and at least 25%, preferably at least 28%, more preferably at least 30% is in the blue wavelength range.

[0020] It should be noted that this embodiment applies when the second luminescent material is an organic phosphor dispersed in a polymer matrix or contains the organic phosphor. This provides an LED filament lamp having an improved appearance when the LED filament is off and does not emit LED filament light.

[0021] The second luminescent material may be configured to convert 3% to 30%, preferably 3% to 15%, of the LED filament light.

[0022] This converts a small amount of LED filament light, resulting in an LED filament lamp with improved lifespan, i.e., a longer lifespan, and improved visibility of the LED filament.

[0023] The LED filament light may be white light having a first correlated color temperature (CCT1), where CCT1 ≤ 2500K.

[0024] By using LED filament light with such a very low CCT, it is ensured that a small amount of LED filament light is converted by the second luminescent material. This ensures that the resulting LED filament lamp light's CCT is also kept within a sufficiently low range, which is acceptable to the human eye and therefore suitable for providing LED filament lamp light that resembles the lamp light of conventional vintage lamps, particularly incandescent bulbs.

[0025] The LED filament light may be white light having a first correlated color temperature (CCT1), and the LED filament lamp light is white light having a second correlated color temperature (CCT2), where CCT2-CCT1≦500K.

[0026] This ensures that the CCT of the resulting LED filament lamp light is shifted only slightly towards a colder CCT, thereby keeping the CCT of the LED filament lamp light within a sufficiently low value CCT region that is favorable to human eye perception and thus suitable for providing LED filament lamp light that resembles the lamp light of conventional vintage lamps, particularly incandescent bulbs.

[0027] The polymer matrix may include non-emissive nanoparticles, particularly non-emissive nanoparticles having a diameter shorter than the visible wavelength range.

[0028] By providing such non-emissive nanoparticles, while ensuring that the envelope remains translucent, the converted LED filament light can be scattered outside the envelope. Thereby, the high visibility of the LED filament is ensured.

[0029] The second luminescent material may include one or more of a first phosphor configured to emit first phosphor light having a dominant wavelength (DW1) within a wavelength range of 550 to 580 nm, and a second phosphor configured to emit second phosphor light having a dominant wavelength (DW2) within a wavelength range of 500 to 550 nm. In an example, the dominant wavelength (DW) of the converted light emitted by the phosphor can be defined, considering the chromaticity diagram, as the wavelength at which (i) the color coordinates of the converted light and (ii) a straight line (L) passing through the point x = 0.333 and y = 0.333 intersect the spectral locus (i.e., the boundary of the chromaticity diagram).

[0030] This can be achieved when the second luminescent material is an organic phosphor dispersed in the polymer matrix, or contains the organic phosphor, and the second luminescent material may be absorbent in the visible wavelength range, wherein at least 55%, preferably at least 58%, more preferably at least 60% of the visible wavelength range is in the green wavelength range, and at least 25%, preferably at least 28%, more preferably at least 30% is in the blue wavelength range. The second luminescent material is configured to convert 3% to 30%, or 3% to 15%, of the LED filament light. The second luminescent material may have a first (organic / QD) phosphor, such as a first (organic / QD) phosphor containing Lumogen F-240, a second (organic / QD) phosphor, such as a second (organic / QD) phosphor containing Lumogen F-083, or both a first (organic / QD) phosphor and a second (organic / QD) phosphor containing Lumogen F-240 and Lumogen F-083. The second luminescent material 37 may further be configured to cause no, substantially no, or almost no scattering of the LED filament light.

[0031] Such phosphors have proven particularly efficient in providing the desired amber appearance of the LED filament lamp.

[0032] The LED filament does not need to contain organic phosphors and quantum dots, and the translucent envelope does not need to contain inorganic phosphors.

[0033] This provides an LED filament lamp in which the LED filament has further improved performance and / or appearance within the lamp, while the envelope is still perceived as amber. Such an LED filament lamp also has a vintage or nostalgic look that functions even better.

[0034] The LED filament has an off state in which it does not emit LED filament light, and an on state in which it emits LED filament light. The LED filament is visible through the translucent envelope in both the off state and the on state.

[0035] This provides an LED filament lamp that includes high visibility of the LED filament and an improved appearance in both the off and on states.

[0036] The first luminescent material may have one or more of the following: a green-to-yellow inorganic phosphor configured to emit green-to-yellow light, and a red inorganic phosphor configured to emit red light. The inorganic phosphor may be an organic phosphor or a phosphor that does not contain QDs.

[0037] Such phosphors have proven to function particularly efficiently and well in providing the LED filament light having the desired parameters, especially the desired CCT and wavelength spectrum.

[0038] The aforementioned green to yellow inorganic phosphor may contain one or more of YAG phosphors and LuAG phosphors, and the aforementioned red inorganic phosphor may contain a KSiF phosphor.

[0039] The elongated support may be light-transmitting, and a further sealing material may be provided on the second surface of the support opposite to the first surface of the support on which the plurality of LEDs are arranged, wherein the further sealing material includes at least one of a further luminescent material configured to convert at least a portion of the LED light and / or converted light into further converted light, and a further light-scattering material configured to scatter at least a portion of the LED light and / or converted light into further scattered light.

[0040] This prevents the absorption of LED filament light in the support. This provides an LED lamp with improved intensity of LED filament lamp light.

[0041] The translucent envelope may have a glass envelope, and the second luminescent material may be provided as a coating on the glass envelope.

[0042] This provides an LED filament lamp that is particularly easy to manufacture.

[0043] The translucent envelope may have a neck portion, which forms the portion of the translucent envelope attached to the base, and the neck portion may not contain the second luminescent material.

[0044] This provides an LED filament lamp that, especially in the off state, has a visual appearance that more closely resembles a vintage lamp.

[0045] The second luminescent material may further be configured to produce no or substantially no scattering.

[0046] This ensures that the LED filament remains clearly visible even through the second luminescent material.

[0047] The LED filament lamp may have multiple LED filaments.

[0048] The plurality of LED filaments may be the same. Alternatively, the plurality of LED filaments may differ from one another, for example, in terms of color, length, and / or light conversion characteristics.

[0049] As a result, the LED lamp may have an LED filament structure with a wide variety of appearances.

[0050] The present invention further relates to a lighting fixture having at least one LED filament lamp according to the present invention.

[0051] It should be noted that the present invention relates to all possible combinations of the features listed in the claims. [Brief explanation of the drawing]

[0052] Herein, this and other aspects of the present invention will be described in more detail with reference to the accompanying drawings illustrating embodiments of the present invention. [Figure 1] A first luminescent material and a perspective view of an LED filament lamp according to the present invention comprising the first luminescent material are shown. [Figure 2] Figure 1 shows an example of an LED filament lamp; a more detailed perspective view of the LED filament is shown. [Figure 3] A schematic close-up diagram of an exemplary second luminescent material is shown. [Figure 4] The graphs show the absorption coefficients (dashed lines) and emission spectra (solid lines) of many different suitable phosphors, plotted as normalized intensities as a function of the wavelength of incident light. [Figure 5] A graph illustrating the spectrum of light emitted from the LED filament according to the present invention as perceived by an observer, as a function of wavelength, is shown. [Figure 6] This shows a vertical cross-sectional view of a lighting fixture having an LED filament lamp according to the present invention.

[0053] The sizes of layers and regions as shown in the figures are exaggerated for illustrative purposes and are therefore shown to illustrate the general structure of embodiments of the present invention. Throughout, similar reference numerals refer to similar elements. [Modes for carrying out the invention]

[0054] The present invention will now be described in more detail with reference to the accompanying drawings, which illustrate currently preferred embodiments of the invention. However, the present invention can be carried out in a variety of forms and should not be construed as being limited to the embodiments described herein; more precisely, these embodiments are shown for completeness and perfection and fully convey the scope of the invention to those skilled in the art.

[0055] Referring to Figure 1, an exemplary LED filament lamp 1 according to the present invention is shown. The LED filament lamp 1 is configured to emit LED filament lamp light L3 during operation. The LED filament lamp 1 is shown in the form of a light bulb. The LED filament lamp 1 has an LED filament array 2. In the shown embodiment, the LED filament array 2 has substantially linear filaments 21 to 24. The filaments 21 to 24 of such an LED filament array 2 may be filaments of other shapes, such as spiral, helix, meandering, twisted, flat, and combinations thereof, in other embodiments. In the shown embodiment, the LED filament lamp 1 has four LED filaments 21, 22, 23, and 24. In other embodiments, the LED filament lamp 1 may have a different number of LED filaments, such as one, two, three, or five LED filaments, whether fewer or more than four. Each LED filament 21 to 24 is configured to emit LED filament light L2 during operation.

[0056] Referring also to Figure 2, each LED filament 21 to 24 has a plurality of LEDs 3, 4, 5, and 6. The plurality of LEDs 3 to 6 are configured to emit LED light L1 during operation. Each of the plurality of LEDs 3 to 6 is arranged on the respective elongated supports 7, 8, 9, and 10, in particular on the first surface 71 of the elongated supports 7 to 10.

[0057] Elongated encapsulants 11, 12, 13, and 14 are provided. As better seen in Figure 2, each elongated encapsulant 11 to 14 covers each of the plurality of LEDs 3 to 6 and at least a portion of the associated elongated supports 7 to 10. Each elongated encapsulant 11 to 14 is therefore positioned on the surface of each elongated support 7 to 10 on which each of the plurality of LEDs 3 to 6 is arranged, particularly on the first surface 71. Each elongated encapsulant 11 to 14 includes one or both of a first luminescent material 38 configured to at least partially convert LED light L1 into converted LED light, and a light scattering material 39 configured to at least partially scatter LED light into scattered LED light. The first luminescent material 38 may have a yellow inorganic phosphor, a red inorganic phosphor such as a red inorganic phosphor including a KSiF phosphor, or a combination of a yellow inorganic phosphor and a red inorganic phosphor such as YAG and KSiF. The inorganic phosphor may be an organic phosphor or a phosphor that does not contain QD.

[0058] Therefore, the LED filament light L2 includes not only the LED light L1 but also the converted LED light and / or scattered LED light. Generally, the LED filament light L2 has a first correlated color temperature CCT1, and the first correlated color temperature CCT1 is 2500K or less.

[0059] The elongated supports 7 to 10 have electrical wiring 25 and 26 (see Figure 2) for supplying electrical energy to a plurality of LEDs 3 to 6 attached to the elongated supports 7 to 10. The elongated supports 7 to 10 may be a substrate or a printed circuit board (PCB).

[0060] The elongated supports 7 to 10 may further be light-transmitting. In such cases, a sealing material 43 may be provided on the second surface 72 of the supports 7 to 10 opposite to the first surface 71 of the supports 7 to 10 on which the plurality of LEDs 3 to 6 are arranged. Optionally, the sealing material 43 may also include one or more luminescent materials similar to or identical to the first luminescent material 38 and light scattering materials similar to or identical to the light scattering material 39. In other examples, the sealing material 43 may include at least one of a further luminescent material configured to convert at least a portion of the LED light and / or converted light into further converted light, and a further light scattering material configured to scatter at least a portion of the LED light and / or converted light into further scattered light.

[0061] Referring again to Figure 1, the LED filament lamp 1 further has a translucent envelope 15 that at least partially surrounds at least one LED filament array 2. The translucent envelope 15 may be molded into any feasible shape, such as resembling the shape of one of the following: a standard light bulb, a spherical light bulb, a candle light bulb, a customized light bulb, or even a spiral light bulb. The translucent envelope 15 has a second luminescent material 37. Referring also to Figure 3, the second luminescent material 37 includes one or more of the following: phosphors 41 dispersed in a polymer matrix 40 and quantum dots 42 dispersed in the polymer matrix 40. The polymer matrix 40 may further have non-luminescent nanoparticles. The non-luminescent nanoparticles may have a diameter shorter than the visible wavelength range. The second luminescent material 37 is configured to partially convert the LED filament light L2 into converted LED filament light. Thus, the LED filament lamp light L3 has the LED filament light L2 and the converted LED filament light. The second luminescent material 37 has absorbencies such that at least 80% of its absorption in the visible wavelength range falls within the blue and green wavelength ranges. This imparts an amber color to the translucent envelope 15 that is perceptible to the observer. The second luminescent material may be provided as a coating on the translucent envelope 15. Alternatively, or in addition, the second luminescent material may be provided within the bulk of the translucent envelope 15. The second luminescent material 37 may further have a gradient of thickness or density across the translucent envelope 15.

[0062] If the second luminescence material 37 is or contains quantum dots 42 dispersed in the polymer matrix 40, the absorption rate of the second luminescence material 37 in the visible wavelength range is higher in the blue wavelength range than in the green wavelength range. If the second luminescence material 37 is or contains organic phosphors 41 dispersed in the polymer matrix 40, the second luminescence material 37 may have absorption in the visible wavelength range, where at least 55%, preferably at least 58%, more preferably at least 60% of the visible wavelength range is in the green wavelength range, and at least 25%, preferably at least 28%, more preferably at least 30% is in the blue wavelength range. The second luminescence material 37 is configured to convert 3% to 30%, or 3% to 15%, of the LED filament light. The second luminescent material 37 may have a first (organic / QD) phosphor, such as a first (organic / QD) phosphor containing Lumogen F-240, a second (organic / QD) phosphor, such as a second (organic / QD) phosphor containing Lumogen F-083, or both a first (organic / QD) phosphor and a second (organic / QD) phosphor containing Lumogen F-240 and Lumogen F-083. The second luminescent material 37 may further be configured to cause no, substantially no, or almost no scattering of LED filament light.

[0063] The translucent envelope 15 may be a glass envelope. In such a case, the second luminescent material 37 may be provided as a coating on the glass envelope. The translucent envelope 15 may further have a neck portion 16. The neck portion 16 may include the second luminescent material 37. In other examples, the neck portion 16 may not include the second luminescent material 37.

[0064] The LED filament lamp 1 further includes a base 17, such as a cap. The translucent envelope 15 is connected to or attached to the base 17. The base 17 is configured to electrically and mechanically connect the LED filament lamp 1 to the socket of a lighting fixture (see Figure 6). The neck portion 16, if provided, forms the portion of the translucent envelope 15 that is connected to or attached to the base 17.

[0065] The LED filament lamp 1 may further have a thread 18 for connecting to a socket and a terminal 19 for connecting to a source of electrical energy. The thread 18 and terminal 19 may form part of the base 17 or be provided on the base 17.

[0066] The LED filament lamp 1 may optionally further include a driver or controller 30 configured to control the LED filament lamp 1. The driver or controller 30 may be an external unit, a unit disposed within the LED filament lamp 1 as shown in Figure 1, or a combination of both. The controller 30 is configured to supply power to a plurality of LEDs 3 to 6 via the electrical circuit (not shown) of the LED filament lamp 1. The controller 30 may further be configured to control at least one of the CCT and CRI of the LED filament lamp light L3. The controller 30 may also be configured to control other parameters related to the LED filament lamp light source (i.e., the plurality of LEDs 3 to 6) and the LED filament lamp light L3. As shown in Figure 1, the controller 30 is disposed within a translucent envelope 15. The controller 30 may also be disposed within a base 17 so as to be hidden from view.

[0067] The LED filament lamp 1 may further have an exhaust pipe 31. The exhaust pipe 31 is disposed within the stem 33 of the LED filament lamp 1, preferably in the center. The exhaust pipe 31 is configured to seal gas between the translucent envelope 15 and the exhaust pipe 31. The controller 30 may be disposed between the translucent envelope 15 and the exhaust pipe 31.

[0068] The LED filament lamp 1 may further have one or two conductive base wires 32. The one or two conductive base wires 32 are separate from at least two conductive wires 25 and 26. In the embodiment shown in Figure 1, the connection between the one or two conductive base wires 32 and the conductive wires 25 and 26 of each LED filament 21 to 24 is achieved by respective wire segments 34 connected to the one or two conductive base wires 32 at a first end. The one or two conductive base wires 32 pass through the exhaust pipe 31 so as to be electrically connected to a driver 52 (see Figure 6) or a controller 30 or power supply at a second end opposite to the first end (not shown in the figure).

[0069] Figure 4 illustrates the absorption coefficient and emission spectrum of several different suitable phosphors, plotted as normalized intensity as a function of incident light wavelength. The absorption coefficient is shown by a dashed line, and the emission spectrum is shown by a solid line. The incident light is LED light with a correlated color temperature (CCT) of 2200 K.

[0070] Graphs C and D show the absorption coefficient and emission spectrum of Lumogen F-083 phosphor (i.e., second phosphor), respectively. Graphs E and D show the absorption coefficient and emission spectrum of Lumogen F-240 phosphor (i.e., first phosphor), respectively.

[0071] Figure 5 shows a graph illustrating the spectrum of light produced by an exemplary LED filament lamp according to the present invention, which includes a second luminescent material 37 as perceived by an observer, as a function of wavelength. It can be seen that the spectrum of light, or at least the dominant wavelength of light in the spectrum, is consistent with that of light perceived by an observer as having an amber color.

[0072] Finally, looking at Figure 6, an exemplary lighting fixture in the form of a pendant 50 is shown. The pendant 50 has an LED filament lamp 1 according to any embodiment of the present invention. In the embodiments shown, the LED filament lamp 1 is of the type shown in Figure 1 and has a substantially linear filament. The filament of such an LED filament lamp 1 may have other shapes, such as spiral, helix, meandering, twisted, flat, and combinations thereof, in other embodiments.

[0073] The pendant 50 further includes a socket 51 for connecting an LED filament lamp 1 to the pendant 50. The socket 51 is adapted to cooperate with the base 17 of the LED filament lamp 1. The socket 51 may have threads adapted to cooperate with the threads 18 of the LED filament lamp 1. The socket 51 may have terminals adapted to cooperate with the terminals 19 of the LED filament lamp 1.

[0074] The pendant 50 may further include a driver 52 configured to control the LED filament lamp 1. The driver 52 may be the same unit as the controller 30 described above, or it may not be the same unit as the controller 6 described above. In other words, the driver 52 and the controller 30 may be integrated into the same driver or controller, or they may be separate units. The driver 52 is configured to supply power to the plurality of LED filaments 21 to 24 via the conductive wires of the LED filament lamp 1. The driver 52 may further be configured to control at least one of the CCT and CRI of the LED filament lamp light L3. The driver 52 may also be configured to control other parameters related to the LED filament lamp light source (i.e., the plurality of LEDs 3 to 6) and the LED filament lamp light L3.

[0075] As shown in Figure 6, the driver 52 is mounted on the reflector or screen 53 of the pendant 50. The driver may also be mounted or incorporated within the reflector or screen 53. The pendant 50 further has electrical wiring 54 for connecting to a power source such as a mains power supply.

[0076] Please note that the pendant 50 shown in Figure 6 is merely one example of a lighting fixture according to the present invention. Any suitable type of lighting fixture is conceivable, but is not limited to, standing luminaires, wall-hanging luminaires, chandeliers, reading lamps, outdoor lighting fixtures, and table lamps.

[0077] Those skilled in the art will see that the present invention is by no means limited to the preferred embodiments described above. On the contrary, many modifications and changes are possible within the scope of the appended claims.

[0078] Furthermore, a person skilled in the art will be able to understand and achieve modifications to the disclosed embodiments in the practice of the claimed invention by studying the drawings, specification and appended claims. In the claims, the word “has” does not exclude other elements or steps, and singular notation does not exclude plural. The mere fact that certain means are listed in different dependent claims does not mean that combinations of these means cannot be used to one's advantage.

Claims

1. This is an LED filament lamp that supplies light to the LED filament lamp during operation. An LED filament that emits LED filament light during operation, comprising a plurality of LEDs that emit LED light during operation and are arranged on an elongated support, and an elongated encapsulant that covers the plurality of LEDs and at least a portion of the elongated support, wherein the elongated encapsulant comprises at least one of a first luminescent material configured to convert at least a portion of the LED light into converted light, and a light scattering material configured to scatter at least a portion of the LED light into scattered light, wherein the LED filament light comprises the converted light and / or the scattered light of the LED filament, A base configured to electrically and mechanically connect the LED filament lamp to the socket of a lighting fixture, An LED filament lamp having a translucent envelope that at least partially surrounds the LED filament and is attached to the base, The translucent envelope comprises a second luminescent material, the second luminescent material comprises one or more organic phosphors and quantum dots dispersed in a polymer matrix, the second luminescent material is configured to convert a portion of the LED filament light into LED filament light, and the second luminescent material is absorbent in the visible wavelength range, where at least 80% of the visible wavelength range is in the blue and green wavelength range, such that the translucent envelope is perceived to have an amber color. The second luminescent material is A first phosphor configured to emit first phosphor light having a dominant wavelength in the wavelength range of 550 to 580 nm, and An LED filament lamp comprising one or more second phosphors configured to emit second phosphor light having a dominant wavelength within the wavelength range of 500 to 550 nm.

2. The LED filament lamp according to claim 1, wherein the absorption rate of the second luminescent material in the visible wavelength range is higher in the blue wavelength range than in the green wavelength range.

3. The LED filament lamp according to claim 1, wherein the second luminescent material is absorbent in the visible wavelength range, wherein at least 55% of the visible wavelength range is in the green wavelength range and at least 25% is in the blue wavelength range.

4. The LED filament lamp according to any one of claims 1 to 3, wherein the second luminescent material is configured to convert 3% to 30% of the LED filament light.

5. The LED filament lamp according to any one of claims 1 to 3, wherein the LED filament light is white light having a first correlated color temperature CCT1, and CCT1 ≤ 2500K.

6. The LED filament lamp according to any one of claims 1 to 3, wherein the LED filament light is white light having a first correlated color temperature CCT1, and the LED filament lamp light is white light having a second correlated color temperature CCT2, and CCT2 - CCT1 ≤ 500K.

7. The LED filament lamp according to any one of claims 1 to 3, wherein the LED filament does not contain organic phosphors and quantum dots, and the translucent envelope does not contain inorganic phosphors.

8. The LED filament lamp according to any one of claims 1 to 3, wherein the LED filament is visible through the translucent envelope in both the off state, where it does not emit LED filament light, and the on state, where it emits LED filament light.

9. The LED filament lamp according to any one of claims 1 to 3, wherein the first luminescent material comprises a green to yellow inorganic phosphor configured to emit green to yellow light and a red inorganic phosphor configured to emit red light.

10. The LED filament lamp according to claim 9, wherein the green to yellow inorganic phosphor comprises a YAG and / or LuAG phosphor, and the red inorganic phosphor comprises a KSiF phosphor.

11. The LED filament lamp according to any one of claims 1 to 3, wherein the elongated support is light-transmitting, and a further sealing material is provided on the second surface of the support opposite to the first surface of the support on which the plurality of LEDs are arranged, and the further sealing material comprises at least one of a further luminescent material configured to convert at least a portion of the LED light and / or converted light into further converted light, and a further light scattering material configured to scatter at least a portion of the LED light and / or converted light into further scattered light.

12. The LED filament lamp according to any one of claims 1 to 3, wherein the translucent envelope has a glass envelope, and the second luminescent material is provided as a coating on the glass envelope.

13. The LED filament lamp according to any one of claims 1 to 3, wherein the translucent envelope has a neck portion, the neck portion forms a portion of the translucent envelope attached to the base, and the neck portion does not contain the second luminescent material.

14. A lighting fixture having at least one LED filament lamp as described in any one of claims 1 to 3.

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