White light emitting device based on solid state sources and on wavelength-conversion

Abstract

A solid-state based device (1) configured to emit white light (2) and comprising: a first light source (3) to provide first light (4) having a first peak wavelength λ1, a second light source (5) to provide second light (6) having a second peak wavelength λ2, wherein λ1 and λ2 differ by at least 20 nm, a third light source (7) to provide third light (8) having a third peak wavelength λ3, and a luminescent element (11) arranged in an optical path of the first light (4) and the second light (6), wherein the element (11) comprises a first luminescent material (12) configured to convert a first part of the first light (4) into first converted light (14), and to convert a first part of the second light (6) into second converted light (15), having a plurality of peak wavelengths λg in 500-560nm range, wherein the element (11) further comprises a second luminescent material (13) configured to convert a second part of the first light (4) into third converted light (16), and to convert a second part of the second light (6) into fourth converted light (17), having a plurality of peak wavelengths λr in 600-650nm range, and wherein the white light (2) comprises a combination of: a part of the first light (4), a part of the second light (6), the first converted light (14), the second converted light (15), the third converted light (16), the fourth converted light (17), and the third light (8).

Description

[0001] 2025PF80064

[0002] 1

[0003] A LIGHT EMITTING DEVICE

[0004] FIELD OF THE INVENTION

[0005] The invention relates to a light emitting device configured to, in operation, emit device light and comprising a first solid-state light source configured to provide, in operation, first light source light and a second solid-state light source configured to provide, in operation, second light source light.

[0006] BACKGROUND OF THE INVENTION

[0007] Eyestrain, also known as asthenopia, is a common condition that occurs when one’s eyes get tired from intense use, such as staring at a book or picture for a long time. Symptoms of eyestrain include eye fatigue, headaches, blurred vision, dry eyes, and neck and shoulder pain.

[0008] It is desired to reduce eyestrain. It is more particularly desired to provide a light emitting device configured to provide device light of a type suitable for reducing eyestrain. It is further desired to provide such a light emitting device which is also highly efficient.

[0009] SUMMARY OF THE INVENTION

[0010] It is an object of the present invention to overcome this problem, and to provide a light emitting device which is configured to provide device light of a type suitable for reducing eyestrain, and which is also highly efficient.

[0011] As used herein, the term “violet light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 380 nm to 420 nm.

[0012] As used herein, the term “blue light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 420 nm to 490 nm.

[0013] As used herein, the term “green-yellow light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 500 nm to 590 nm.

[0014] As used herein, the term “green light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 500 nm to 550 nm.2025PF80064

[0015] 2

[0016] As used herein, the term “yellow light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 550 nm to 590 nm.

[0017] As used herein, the term “yellow-orange light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 550 nm to 600 nm.

[0018] As used herein, the term “red light” is intended to refer to light with a peak wavelength falling within the wavelength interval of 600 nm to 640 nm.

[0019] As used herein, the term “deep red light” is intended to refer to light with a peak wavelength falling above 640 nm, such as within the wavelength interval of 640 nm to 680 nm.

[0020] As used herein, the term “white light” is intended to refer to light with correlated color temperature falling within the color temperature range of 2000 K to 9000 K, preferably in a correlated color temperature range of 2700 K to 6500 K.

[0021] As used herein, the term “cool white light” is intended to refer to light with correlated color temperature falling within the color temperature range of 3500 K to 6500 K.

[0022] As used herein, the term “extreme cool white light” is intended to refer to light with correlated color temperature falling within the color temperature range of 6500 K to 9000 K.

[0023] As used herein, the term “warm white light” is intended to refer to light with correlated color temperature falling within the color temperature range of 2000 K to 3500 K.

[0024] As used herein, the terms “upstream” and “downstream” are intended to be understood relative to the direction of propagation of light through the light generating system. In other words, when a first component or feature is arranged “downstream” of a second component or feature, it may be understood that the first component or feature is arranged in a light receiving relationship with the second component or feature.

[0025] As used herein, the term “solid-state light source” is intended to refer to any solid state light source, including LEDs, and especially diode lasers, super-luminescent diodes, multi -junction diodes and a diode array, comprising one or more LEDs.

[0026] According to a first aspect of the invention, this and other objects are achieved by means of a light emitting device configured to, in operation, emit device light, the light emitting device comprising a first solid-state light source configured to provide, in operation, first light source light having a first peak emission wavelength, I, in a wavelength range from 400 nm to 490 nm and a first full width half maximum, FWHM1, wherein FWHM1 < 40 nm, a second solid-state light source configured to provide, in operation, second light2025PF80064

[0027] 3

[0028] source light having a second peak emission wavelength, X2, in a wavelength range from 400 nm to 490 nm and a second full width half maximum, FWHM2, wherein FWHM2 < 40 nm, and wherein kl and X2 are different by at least 20 nm, at least one of (i) a third solid-state light source configured to provide, in operation, third light source light having a third peak emission wavelength, 3, in a wavelength range from 565 nm to 600 nm, and (ii) a fourth solid-state light source configured to provide, in operation, fourth light source light having a fourth peak emission wavelength, 4, being above 640 nm, and a first luminescent element arranged in an optical path of the first light source light emitted by the first solid-state light source and the second light source light emitted by the second solid-state light source, wherein the first luminescent element comprises a first luminescent material being configured to convert a first part of the first light source light into first converted light having a plurality of peak emission wavelengths, gl, (for instance at least 3 peaks such as 3 or 4 or 5 peaks) in a wavelength range from 500 nm to 560 nm (or in a wavelength range from 500 nm to 550 nm), and to convert a first part of the second light source light into second converted light having a plurality of peak emission wavelengths, Xg2, (for instance at least 3 peaks such as 3 or 4 or 5 peaks) in a wavelength range from 500 nm to 560 nm (or in a wavelength range from 500 nm to 550 nm), wherein the first luminescent element further comprises a second luminescent material being configured to convert a second part of the first light source light into third converted light having a plurality of peak emission wavelengths, krl, (for instance at least 2 peaks such as 2 or 3 peaks) in a wavelength range from 600 nm to 650 nm, and to convert a second part of the second light source light into fourth converted light having a plurality of peak emission wavelengths, Xr2, (for instance at least 2 peaks such as 2 or 3 peaks) in a wavelength range from 600 nm to 650 nm, and wherein the device light comprises a combination of (i) at least part of the first light source light, (ii) at least part of the second light source light, (iii) the first converted light, (iv) the second converted light, (v) the third converted light, (vi) the fourth converted light, and (vii) at least one of the third light source light and the fourth light source light, and wherein, in an operational mode of the light emitting device, the device light is white light having a correlated color temperature in a range from 2000 K to 6500 K (or in a range from 2500K to 4500K or in a range from 2650 K to 3500 K) and a color rendering index of at least 80 or at least 85.

[0029] Thereby, a light emitting device configured to provide device light of a type suitable for reducing eyestrain is provided for. The reduced eyestrain is obtained because the spectrum of the claimed light emitting device comprises a multi-narrow-peak spectrum such2025PF80064

[0030] 4

[0031] that different colors of an object can be observed with high contrast. Furthermore, luminescent materials of the types described above providing multi-narrow-peak spectra are very efficient in converting incident light, compared to use of a plurality of luminescent materials of a type providing typically only one spectral peak. Thereby, a light emitting device which further is highly efficient is provided for.

[0032] The first luminescent material and / or the second luminescent material may be ‘single luminescent materials’ having a ‘single chemical composition’, contrary to a mixture of a plurality of luminescent materials. The advantage of a single luminescent material, contrary to a mixture of a pluarlity of luminescent materials, is that crosstalk between multiple luminescent materials, sometimes referred to as re-absorption, caused by overlap between emission spectra an excitation spectra of the plurality of luminescent materials, is avoided. The risk of crosstalk is higher with luminescent materials of which mutual emission spectra and excitation spectra are close to each other, for example, with green luminescent materials that include (greenish) blue in their excitation spetrum and include (bluish) green in their emission spectrum.

[0033] Preferably, the plurality of peak emission wavelengths from the first or second luminescent material comprises multiple peaks that are separated / spaced apart and having non-overlapping FWHM. Alternatively, the emission spectrum provided by the plurality of peak emission wavelengths may be defined as having multiple peaks with minima in between, wherein a minimum is at most 20 % of a neighboring peak maximum.

[0034] Because both luminescent materials and the blue LEDs each provide a multipeak spectrum without crosstalk, a light emitting device with superior color rendering and high efficiency is obtained.

[0035] It may apply that FWHM1 < 35 nm, that FWHM1 < 30 nm, or that FWHM1 < 25 nm.

[0036] It may apply that FWHM2 < 35 nm, that FWHM2 < 30 nm, or that FWHM2 < 25 nm.

[0037] It may apply that XI and <2 are different by at least 25 nm.

[0038] The first peak emission wavelength, I, may be in a wavelength range from 420 nm to 470 nm.

[0039] The second peak emission wavelength, X2, may be in a wavelength range from 420 nm to 470 nm.

[0040] The third peak emission wavelength, X3, may be in a wavelength range from 570 nm to 595 nm, or in a wavelength from 575 nm to 590 nm.2025PF80064

[0041] 5

[0042] The fourth peak emission wavelength, X4, may be at most 680 nm. The fourth peak emission wavelength, X4, may be in a range from 640 nm to 680 nm.

[0043] The device light may be white light having a correlated color temperature in a range from 2500 K to 4000 K and / or a color rendering index of at least 85.

[0044] The plurality of peak emission wavelengths, krl, may comprise at least one peak in a wavelength range from 627 nm to 635 nm and / or at least one peak in a wavelength range from 610 nm to 620 nm.

[0045] The plurality of peak emission wavelengths, r2, may comprise at least one peak in a wavelength range from 627 nm to 635 nm and / or at least one peak in a wavelength range from 610 nm to 620 nm.

[0046] The first luminescent material may be a BaZn2(PO4)2:U6+type of phosphor. The BaZn2(PO4)2:U6+type of phosphor is a particularly efficient phosphor for providing green light with a multi-peak spectrum without crosstalk. Therefore, a light emitting device with superior color rendering and particularly high efficiency is thereby obtained.

[0047] The second luminescent material may be a luminescent material of the type M’XM2-2XAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, for instance comprising one or more of silicon and titanium, wherein X comprises a monovalent anion, at least comprising fluorine.

[0048] Because luminescent materials of such a type does not absorb green light, and because both luminescent materials and the blue LEDs each provide a multi-peak spectrum without crosstalk, a light emitting device with superior color rendering and high efficiency is obtained. Luminescent materials such a type have the further advantage of not absorbing amber light and deep red light.

[0049] For example, the second luminescent material may be a KSiF:Mn4+type of phosphor. Such a phosphor is a particularly efficient phosphor for providing red light with a multi-peak spectrum without crosstalk. Therefore, a light emitting device with superior color rendering and particularly high efficiency is thereby obtained.

[0050] The light emitting device may comprise both the third solid-state light source configured to provide, in operation, third light source light having a third peak emission wavelength, 3, in a wavelength range from 565 to 600 nm, and the fourth solid-state light source configured to provide, in operation, fourth light source light having a fourth peak emission wavelength, X4, being above 640 nm, wherein the device light comprises a2025PF80064

[0051] 6

[0052] combination of (i) at least part of the first light source light, (ii) at least part of the second light source light, (iii) the first converted light, (iv) the second converted light, (v) the third converted light, (vi) the fourth converted light, (vii) the third light source light, and (viii) the fourth light source light.

[0053] In case an amber and deep red LED is used as the third and fourth solid-state light source, respectively, also no green phosphor light is absorbed.

[0054] The light emitting device may further comprise at least one fifth solid-state light source configured to provide, in operation, fifth light source light having a fifth peak emission wavelength, 5, in a wavelength range from 400 nm to 490 nm and a third full width half maximum, FWHM3, wherein FWHM3 < 40 nm, and wherein I, X2, and X5 are mutually different by at least 20 nm, and wherein the device light further comprises the fifth light source light.

[0055] By providing an extra solid-state light source a light emitting device with a further improved efficiency is obtained.

[0056] It may apply that FWHM3 < 35 nm, that FWHM3 < 30 nm, or that FWHM3 < 25 nm.

[0057] The first luminescent element may further be arranged in an optical path of the fifth light source light emitted by the at least one fifth solid-state light source, wherein the first luminescent material further is configured to convert a first part of the fifth light source light into fifth converted light having a plurality of peak emission wavelengths, Xg3, in a wavelength range from 500 nm to 560 nm, wherein the second luminescent material further is configured to convert a second part of the fifth light source light into sixth converted light having a plurality of peak emission wavelengths, Xr3, in a wavelength range from 600 nm to 650 nm, and wherein the device light further comprises the fifth converted light and the sixth converted light.

[0058] Thereby, a light emitting device with a very simple structure is provided for. The third solid-state light source and the fourth solid-state light source may be direct emitting LED light sources. They produce the third light source light and the fourth light source light, respectively, directly through electron-hole recombination within the active region of a solid-state semiconductor material, without the use of phosphor (luminescent material) conversion and therewith avoid a 10%-20% energy loss associated with the Stokes shift (conversion) process in phosphor (luminescent material) converted LEDs.

[0059] Thereby, a light emitting device with a very simple structure is provided for.2025PF80064

[0060] 7

[0061] The third solid-state light source may comprise a first solid-state emitter configured to, in operation, emit first emitter light and a second luminescent element arranged in an optical path of the first emitter light and comprising a third luminescent material configured to convert the first emitter light into the third light source light.

[0062] Alternatively, or additionally, the fourth solid-state light source may comprise a second solid-state emitter configured to, in operation, emit second emitter light and a third luminescent element arranged in an optical path of the second emitter light and comprising a fourth luminescent material configured to convert the second emitter light into the fourth light source light.

[0063] Thereby a light emitting device with a simple, durable, and cost efficient construction is provided for.

[0064] The first luminescent element may further be arranged in an optical path of the third light source light emitted by the third solid-state light source.

[0065] The first luminescent element may further be arranged in an optical path of the fourth light source light emitted by the fourth solid-state light source.

[0066] The first luminescent element may further be configured to convert less than 2 %, or less than 1 %, or less than 0.5 % of the third light source light and the fourth light source light.

[0067] Thereby a light emitting device with a simple structure and improved efficiency is provided for.

[0068] The second luminescent element may be arranged between the first solid-state emitter and the first luminescent element.

[0069] Alternatively, or additionally, the third luminescent element may be arranged between the second solid-state emitter and the first luminescent element.

[0070] Thereby a light emitting device with a simple structure and efficient light conversion is provided for.

[0071] The first peak emission wavelength, Al may be in a wavelength range of 445 nm to 465 nm, and / or the second peak emission wavelength, 2, may be in a wavelength range of 415 nm to 435 nm (or in a wavelength range from 400 nm to 435 nm).

[0072] Such ranges are optimal for excitation of the phosphors. Thereby, optimal excitation of the red and green phosphor, respectively, is obtained.

[0073] The light emitting device may further comprise a controller configured to individually control the first solid-state light source, the second solid-state light source, the at least one of, or both of, the third solid-state light source and the fourth solid-state light2025PF80064

[0074] 8

[0075] source, and optionally the fifth solid-state light source to vary one or more of the correlated color temperature, CCT, (e.g. varying the CCT at least 500 K) the color point, CP, (e.g. varying the x coordinate of the color point at least 0.05 and / or varying the y coordinate of the color point at least 0.05 e.g. based on a CIE 1931 color space) and the color rendering index, CRI, of the device light.

[0076] Providing a controller enables the tuning of the color point and / or the correlated color temperature, CCT, due to the difference in excitation peaks.

[0077] The light emitting device may further comprise at least one sensor for directly or indirectly sensing at least one characteristic of one or more of the first solid-state light source, the second solid-state light source, the at least one of, or both of, the third solid-state light source and the fourth solid-state light source, and optionally the fifth solid-state light source, and wherein the controller further is configured to receive a signal from the sensor, and to individually control the first solid-state light source, the second solid-state light source, the at least one of, or both of, the third solid-state light source and the fourth solid-state light source, and optionally the fifth solid-state light source based on the signal received from the sensor.

[0078] The light emitting device may further comprise at least one sensor for directly or indirectly sensing at least one characteristic of one or more of the intensity and correlated color temperature of ambient light in a room, and wherein the controller further is configured to receive a signal from the sensor, and to individually control the first solid-state light source, the second solid-state light source, the at least one of, or both of, the third solid-state light source and the fourth solid-state light source, and optionally the fifth solid-state light source based on the signal received from the sensor.

[0079] The invention further relates to a lamp comprising a light emitting device according to the invention.

[0080] The lamp may further comprise a light transmissive envelope at least partly enclosing the LED filament and / or a base for electrically and mechanically connecting the LED filament lamp to a socket or a socket of a luminaire.

[0081] The invention further relates to a luminaire comprising a light emitting device according to the invention.

[0082] The invention further relates to a luminaire comprising a lamp according to the invention.

[0083] The luminaire may comprise a light exit window and / or a luminaire housing.2025PF80064

[0084] 9

[0085] It is noted that the invention relates to all possible combinations of features recited in the claims.

[0086] BRIEF DESCRIPTION OF THE DRAWINGS

[0087] This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing embodiment(s) of the invention.

[0088] Fig. 1 shows a schematical cross-sectional side view of a light emitting device according to the invention.

[0089] Fig. 2 shows a schematical cross-sectional side view of another light emitting device according to the invention.

[0090] Fig. 3 shows a schematical cross-sectional side view of another light emitting device according to the invention.

[0091] Fig. 4 shows a graph illustrating the intensity as a function of wavelength of (i) the light emitted by the various light sources of the light emitting device according to Fig. 3, and (ii) the intensity as a function of wavelength of the device light of the light emitting device according to Fig. 3.

[0092] Fig. 5 shows a schematical cross-sectional side view of another light emitting device according to the invention.

[0093] Fig. 6 shows a schematical cross-sectional side view of another light emitting device according to the invention.

[0094] Fig. 7 shows a graph of the intensity in arbitrary units as a function of the wavelength of excitation (solid line) and emission (dashed line), respectively, for a BaZn2(PO4)2:U6+type of phosphor.

[0095] Fig. 8 shows a graph of the intensity in arbitrary units as a function of the wavelength of emission (Em; solid line) and excitation (Ex; dashed line), respectively, for a KSiF phosphor.

[0096] Fig. 9 shows a schematical side view of a lamp comprising a light emitting device according to the invention.

[0097] Fig. 10 shows a schematical side view of a luminaire comprising a lamp and a light emitting device according to the invention.

[0098] As illustrated in the figures, the sizes of layers and regions are exaggerated for illustrative purposes and, thus, are provided to illustrate the general structures of embodiments of the present invention. Like reference numerals refer to like elements throughout.2025PF80064

[0099] 10

[0100] DETAILED DESCRIPTION

[0101] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which currently preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and fully convey the scope of the invention to the skilled person.

[0102] Fig. 1 shows a schematical cross-sectional side view of a light emitting device 1 according to the invention. Generally, and irrespective of the invention, the light emitting device 1 comprises a first solid-state light source 3, a second solid-state light source 5 and a first luminescent element 11. The light emitting device 1 is configured to, in operation, emit device light 2.

[0103] The first solid-state light source 3 is configured to provide, in operation, first light source light 4. The first light source light 4 comprises a first peak emission wavelength, XI, in a wavelength range from 400 nm to 490 nm and a first full width half maximum, FWHM1, wherein FWHM1 < 40 nm. The first light source light 4 is blue light. The first peak emission wavelength, I, may for instance be in a wavelength range of 445 nm to 465 nm.

[0104] The second solid-state light source 5 is configured to provide, in operation, second light source light 6. The second light source light 6 comprises a second peak emission wavelength, X2, in a wavelength range from 400 nm to 490 nm and a second full width half maximum, FWHM2, wherein FWHM2 < 40 nm. The second light source light 6 is blue light. The first peak emission wavelength XI and the second peak emission wavelength X2 are chosen to be different by at least 20 nm. The second peak emission wavelength, X2, may for instance be in a wavelength range of 415 nm to 435 nm.

[0105] The first luminescent element 11 is arranged in an optical path of the first light source light 4 and the second light source light 6. The first luminescent element 11 comprises a first luminescent material 12 and a second luminescent material 13.

[0106] The first luminescent material 12 is configured to convert a first part of the first light source light 4 into first converted light 14. The first converted light 14 comprises a plurality of peak emission wavelengths, Xgl, in a wavelength range from 500 nm to 560 nm, or from 500 nm to 550 nm. The first converted light 14 is green light. The first luminescent material 12 is further configured to convert a first part of the second light source light 6 into second converted light 15. The second converted light 15 comprises a plurality of peak2025PF80064

[0107] 11

[0108] emission wavelengths, Xg2, in a wavelength range from 500 nm to 560 nm, or from 500 nm to 550 nm. The second converted light 15 is green light.

[0109] The first luminescent material 12 is thus a green phosphor capable of producing an emission with a plurality of peak emission wavelengths. For instance, the first luminescent material 12 may be a BaZn2(PO4)2:U6+type of phosphor.

[0110] The second luminescent material 13 is configured to convert a second part of the first light source light 4 into third converted light 16. The third converted light 16 comprises a plurality of peak emission wavelengths, krl, in a wavelength range from 600 nm to 650 nm, or from 600 nm to 640 nm. The third converted light 16 is red light. The second luminescent material 13 is further configured to convert a second part of the second light source light 6 into fourth converted light 17. The fourth converted light 17 comprises a plurality of peak emission wavelengths, Xr2, in a wavelength range from 600 nm to 650 nm, or from 600 nm to 640 nm. The fourth converted light 17 is red light.

[0111] The second luminescent material 13 is thus a red phosphor capable of producing an emission with a plurality of peak emission wavelengths. The second luminescent material 13 is a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, for instance comprising one or more of silicon and titanium, wherein X comprises a monovalent anion, at least comprising fluorine. For example, the second luminescent material 13 may be a KSiF :Mn4+type of phosphor.

[0112] The light emitting device 1 further comprises a third solid-state light source 7. The third solid-state light source 7 is configured to provide, in operation, third light source light 8. The third light source light 8 comprises a third peak emission wavelength, 3, in a wavelength range from 565 to 600 nm. The third light source light 8 is amber light. The third solid-state light source 7 may here be a LED light source. The luminescent element 11 may then, as is illustrated in Fig. 1, optionally further be arranged in an optical path of the third light source light 8.

[0113] The device light 2 produced by the light emitting device 1 comprises a combination of at least a part of the first light source light 4, at least a part of the second light source light 6, the first converted light 14, the second converted light 15, the third converted light 16, the fourth converted light 17, and the third light source light 8. Irrespective of the embodiment, the device light 2 is in one operational mode of the light emitting device 12025PF80064

[0114] 12

[0115] white light comprising a correlated color temperature, CCT, in a range from 2000 K to 6500 K and a color rendering index, CRI, of at least 80.

[0116] The light emitting device 1 further comprises an optional controller 30. The controller 30 is configured to individually control the first solid-state light source 3, the second solid-state light source 5, and the third solid-state light source 7 to vary one or more of the correlated color temperature, CCT, the color point, CP, and the color rendering index, CRI, of the device light 2.

[0117] The light emitting device 1 further comprises an optional sensor 40. One or more sensors 40 may be provided. The sensor 40 is configured for directly or indirectly sensing at least one characteristic of one or more of the first solid-state light source 3, the second solid-state light source 5, and the third solid-state light source 7. When a sensor 40 is provided, the controller 30 is further configured to receive a signal from the sensor 40, and to individually control the first solid-state light source 3, the second solid-state light source 5, and the third solid-state light source 7 based on the signal received from the sensor 40.

[0118] Fig. 2 shows a schematical cross-sectional side view of another light emitting device 100 according to the invention. The light emitting device 100 differs from the light emitting device 1 described above and shown in Fig. 1 in virtue of the following features.

[0119] The light emitting device 100 does not comprise any third solid-state light source 7. Instead, the light emitting device 100 comprises a fourth solid-state light source 9. The fourth solid-state light source 9 is configured to provide, in operation, fourth light source light 10. The fourth light source light 10 comprises a fourth peak emission wavelength, X4, being above 640 nm. The fourth light source light 10 is deep red light. The fourth solid-state light source 9 may here be a LED light source. The luminescent element 11 may then, as is illustrated in Fig. 2, optionally further be arranged in an optical path of the fourth light source light 10.

[0120] The device light 2 produced by the light emitting device 100 comprises a combination of at least a part of the first light source light 4, at least a part of the second light source light 6, the first converted light 14, the second converted light 15, the third converted light 16, the fourth converted light 17, and the fourth light source light 10.

[0121] The light emitting device 100 further comprises an optional controller 30. The controller 30 is configured to individually control the first solid-state light source 3, the second solid-state light source 5, and the fourth solid-state light source 9 to vary one or more of the correlated color temperature, CCT, the color point, CP, and the color rendering index, CRI, of the device light 2.2025PF80064

[0122] 13

[0123] The light emitting device 100 further comprises an optional sensor 40. One or more sensors 40 may be provided. The sensor 40 is configured for directly or indirectly sensing at least one characteristic of one or more of the first solid-state light source 3, the second solid-state light source 5, and the fourth solid-state light source 9. When a sensor 40 is provided, the controller 30 is further configured to receive a signal from the sensor 40, and to individually control the first solid-state light source 3, the second solid-state light source 5, and the fourth solid-state light source 9 based on the signal received from the sensor 40.

[0124] Fig. 3 shows a schematical cross-sectional side view of another light emitting device 101 according to the invention. The light emitting device 101 differs from the light emitting devices 1 and 100 described above and shown in Figs. 1 to 2 in virtue of the following features.

[0125] The light emitting device 101 comprises both a third solid-state light source 7 and a fourth solid-state light source 9. The third solid-state light source 7 is configured to provide, in operation, third light source light 8. The third light source light 8 comprises a third peak emission wavelength, 3, in a wavelength range from 565 nm to 600 nm. The third light source light 8 is amber light. The fourth solid-state light source 9 is configured to provide, in operation, fourth light source light 10. The fourth light source light 10 comprises a fourth peak emission wavelength, X4, being above 640 nm. The fourth light source light 10 is deep red light.

[0126] The third solid-state light source 7 and the fourth solid-state light source 9 may here be LED light sources. The luminescent element 11 may then, as is illustrated in Fig. 3, optionally further be arranged in an optical path of the third light source light 8 and in an optical path of the fourth light source light 10. In such a case, the first luminescent element 11 may be configured to convert less than 0.5 % of the third light source light 8 and the fourth light source light 10.

[0127] The device light 2 produced by the light emitting device 101 comprises a combination of at least a part of the first light source light 4, at least a part of the second light source light 6, the first converted light 14, the second converted light 15, the third converted light 16, the fourth converted light 17, the third light source light 8, and the fourth light source light 10.

[0128] The light emitting device 1 further comprises an optional controller 30. The controller 30 is configured to individually control the first solid-state light source 3, the second solid-state light source 5, the third solid-state light source 7, and the fourth solid-state2025PF80064

[0129] 14

[0130] light source 9 to vary one or more of the correlated color temperature, CCT, the color point, CP, and the color rendering index, CRI, of the device light 2.

[0131] The light emitting device 1 further comprises an optional sensor 40. One or more sensors 40 may be provided. The sensor 40 is configured for directly or indirectly sensing at least one characteristic of one or more of the first solid-state light source 3, the second solid-state light source 5, the third solid-state light source 7, and the fourth solid-state light source 9. When a sensor 40 is provided, the controller 30 is further configured to receive a signal from the sensor 40, and to individually control the first solid-state light source 3, the second solid-state light source 5, the third solid-state light source 7, and the fourth solid-state light source 9 based on the signal received from the sensor 40.

[0132] Fig. 4 shows a graph illustrating the intensity as a function of wavelength of the first, second, third and fourth light source light 4, 6, 8 and 10 emitted by the first, second, third and fourth solid-state light sources 3, 5, 7 and 9, respectively, of the light emitting device 101 according to Fig. 3, and the intensity as a function of wavelength of the device light 2 emitted by the light emitting device 101 according to Fig. 3. Also illustrated is the intensity as a function of wavelength of a fifth light source light 20 emitted by a fifth solid-state light source 19 of a light emitting device 102 to be described further below in relation to Fig. 5.

[0133] As may be seen from Fig. 4, the first converted light 14 and the second converted light 15 comprises a plurality of peak emission wavelengths, kgl and Xg2, in a wavelength range from 500 nm to 550 nm. A peak 25 is shown at a peak emission wavelength of about 450 nm. The peak 25 may be a peak of the first converted light 14 and / or the second converted light 15. Alternatively, the peak 25 may be a peak formed by a part of the first light source light 4 and / or the second light source light 6 being transmitted unconverted by the first luminescent element 11.

[0134] Likewise, the first converted light 14 and the second converted light 15 comprises a plurality of peak emission wavelengths, kr l and 7x2, in a wavelength range from 600 nm to 640 nm.

[0135] Fig. 5 shows a schematical cross-sectional side view of yet another light emitting device 102 according to the invention. The light emitting device 102 differs from the light emitting device 101 described above and shown in Fig. 3 in virtue of the following features.

[0136] The light emitting device 102 further comprises a fifth solid-state light source 19. The fifth solid-state light source 19 is configured to provide, in operation, fifth light2025PF80064

[0137] 15

[0138] source light 20 (see also the peak illustrated in Fig. 4). The fifth light source light 20 comprises a fifth peak emission wavelength, X5, in a wavelength range from 400 nm to 490 nm and a third full width half maximum, FWHM3, wherein FWHM3 < 40 nm. The fifth light source light 20 is blue light. The first peak emission wavelength XI, the second peak emission wavelength X2, and the fifth peak emission wavelength X5 are chosen to be mutually different by at least 20 nm.

[0139] The first luminescent element 11 is further arranged in an optical path of the fifth light source light 20.

[0140] The first luminescent material 12 is further configured to convert a first part of the fifth light source light 20 into fifth converted light 21. The fifth converted light 21 comprises a plurality of peak emission wavelengths, Xg3, in a wavelength range from 500 nm to 560 nm, or from 500 nm to 550 nm. The fifth converted light 21 is green light.

[0141] The second luminescent material 13 is further configured to convert a second part of the fifth light source light 20 into sixth converted light 22. The sixth converted light 22 comprises a plurality of peak emission wavelengths, Xr3, in a wavelength range from 600 nm to 650 nm, or from 600 nm to 640 nm. The sixth converted light 22 is red light.

[0142] The device light 2 produced by the light emitting device 102 comprises a combination of at least a part of the first light source light 4, at least a part of the second light source light 6, the first converted light 14, the second converted light 15, the third converted light 16, the fourth converted light 17, the third light source light 8, the fourth light source light 10, the fifth converted light 21 and the sixth converted light 22.

[0143] It is also feasible that one of the third solid-state light source 7 and the fourth solid-state light source 9 may be omitted. In other words, it is feasible that any of the light emitting devices 1 and 100 shown in Figs. 1 and 2 and described further above may also comprise a fifth solid-state light source 19.

[0144] In a further embodiment one of the first peak emission wavelength, I, the second peak emission wavelength, X2, and, where provided, the fifth peak emission wavelength, X5, is at a wavelength range of 460 nm, and another one of the first peak emission wavelength, XI, the second peak emission wavelength, X2, and, where provided, the fifth peak emission wavelength, X5, is at a wavelength range of 425 nm.

[0145] Fig. 6 shows a schematical cross-sectional side view of yet another light emitting device 103 according to the invention. The light emitting device 103 differs from the light emitting device 102 described above and shown in Fig. 5 in virtue of the following features.2025PF80064

[0146] 16

[0147] The third solid-state light source 7 now comprises a first solid-state emitter 71 and a second luminescent element 73. The first solid-state emitter 71 is configured to, in operation, emit first emitter light 72. The second luminescent element 73 is arranged in an optical path of the first emitter light 72. The second luminescent element 73 comprises a third luminescent material 74. The third luminescent material 74 is configured to convert the first emitter light 72 into the third light source light 8. The second luminescent element 73 may, as shown in Fig. 6, be arranged between the first solid-state emitter 71 and the first luminescent element 11.

[0148] Likewise, the fourth solid-state light source 9 comprises a second solid-state emitter 91 and a third luminescent element 93. The second solid-state emitter 91 is configured to, in operation, emit second emitter light 92. The third luminescent element 93 is arranged in an optical path of the second emitter light 92. The third luminescent element 93 comprises a fourth luminescent material 94. The fourth luminescent material 94 is configured to convert the second emitter light 92 into the fourth light source light 10. The third luminescent element 93 may, as shown in Fig. 6, be arranged between the second solid-state emitter 91 and the first luminescent element 11.

[0149] As is also shown in Fig. 6, the second luminescent element 73, or the third luminescent material 74, may optionally further be arranged in an optical path of one or more of the first light source light 4 emitted by the first solid-state light source 3, the second light source light 6 emitted by the second solid-state light source 5, and the fifth light source light 20 emitted by the fifth solid-state light source 19.

[0150] Likewise, the third luminescent element 93, or the fourth luminescent material 94, may further optionally be arranged in an optical path of one or more of the first light source light 4 emitted by the first solid-state light source 3, the second light source light 6 emitted by the second solid-state light source 5, and, where provided, the fifth light source light 20 emitted by the fifth solid-state light source 19.

[0151] Still further, the third luminescent material 74 and the fourth luminescent material 74 may also optionally be provided in the same luminescent element. In such a case, the second luminescent element 73 and the third luminescent element 93 are one and the same luminescent element. In such a case, the third luminescent material 74 may also optionally be arranged in an optical path of the second emitter light 92, and / or the fourth luminescent material 94 may also optionally be arranged in an optical path of the first emitter light 72.2025PF80064

[0152] 17

[0153] Fig. 7 illustrates a graph of the intensity in arbitrary units as a function of the wavelength of emission (solid line) and excitation (dashed line), respectively, for a BaZn2(PO4)2:U6+type of phosphor suitable for use as the first luminescent material 12 of the first luminescent element 11 of a light emitting device 1, 100, 101, 102, 103 according to the invention.

[0154] Referring now to Fig. 8, suitable phosphors of the KSiF-type for use as a second luminescent material 13 of a first luminescent element 11 of a light emitting device 1, 100, 101, 102, 103 according to the invention will be described.

[0155] KSiF class

[0156] Generally, KSiF class phosphors are suitable for use as a part of or all of the second luminescent material 13 of the first luminescent element 11.

[0157] KSiF class phosphors are luminescent materials of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, for instance comprising one or more of silicon and titanium, wherein X comprises a monovalent anion, at least comprising fluorine.

[0158] Relevant alkaline cations (M) are sodium (Na), potassium (K) and rubidium (Rb). Optionally, also lithium and / or cesium may be applied. In a preferred embodiment, M comprises at least potassium. In yet another embodiment, M comprises at least rubidium. The phrase “wherein M comprises at least potassium” indicates for instance that of all M cations in a mole M’xM2-2xAX6 , a fraction comprises K+and an optionally remaining fraction comprises one or more other monovalent (alkaline) cations (see also below). In another preferred embodiment, M comprises at least potassium and rubidium. Optionally, the M’XM2-2xAXe luminescent material has the hexagonal phase. In yet another embodiment, the M’XM2-2xAXe luminescent material has the cubic phase. For x=0, the composition is M2AX6.

[0159] Relevant alkaline earth cations (M’) are magnesium (Mg), strontium (Sr), calcium (Ca) and barium (Ba), especially one or more of Sr and Ba.

[0160] The term “tetravalent manganese” refers to Mn4+. This is a well-known luminescent ion. In the formula as indicated above, part of the tetravalent cation A (such as Si) is being replaced by manganese. Hence, M’xM2-2xAX6 doped with tetravalent manganese may also be indicated as M’xM2-2xAi-mMnmX6. The mole percentage of manganese, i.e. the percentage it replaces the tetravalent cation A will in general be in the range of 0.1-15 %, especially 1-12 %, i.e. m is in the range of 0.001-0.15, especially in the range of 0.01-0.12.2025PF80064

[0161] 18

[0162] As indicated above, X relates to a monovalent anion, but at least comprises fluorine. Other monovalent anions that may optionally be present may be selected from the group consisting of chlorine (Cl), bromine (Br), and iodine (I).

[0163] In an embodiment, M’xM2-2xAX6 comprises K^SiFe (indicated herein also as KSiF system). As indicated above, in another preferred embodiment, M’xM2-2xAX6 comprises KRbSiFe (herein also indicated as K,Rb system). As indicated above, part of silicon is replaced by manganese (i.e. the formula may also be described as K2Sii-mMnmF6 or KRbSii-mMnmF6, with m as indicated above, or as KRbSiFe:Mn and K2SiFe:Mn, respectively). As manganese replaces part of a host lattice ion and has a specific function, it is also indicated as “dopant” or “activator”. Hence, the hexafluorosilicate is doped or activated with manganese (Mn4+).

[0164] In specific embodiments, the luminescent material may comprise (K,Rb)2SiFe:Mn4+. Alternatively, or additionally, in embodiments the third luminescent material may comprise K2SiFe:Mn4+. Alternatively, or additionally, in embodiments the third luminescent material may comprise K2TiFe:Mn4+. In embodiments, the third luminescent material may comprise K2(Si,Ti)Fe:Mn4+. As can be derived from the above, “Si,Ti” may indicate one or more of Si and Ti.

[0165] Fig. 8 shows a graph of the intensity in arbitrary units as a function of the wavelength of emission (solid line) and excitation (dashed line), respectively, for a KSiF phosphor. That is, the broader peaks are the excitation, the few narrow peaks are the emission.. KSiF phosphors can be effectively excited by a 460 nm blue LED with a strongest emission peak wavelength at near 631 nm, full width at half maxima (FWHM) smaller than 60nm with comparatively high color purity. Combined with P-SIAION green phosphor (cf. Fig. 8) for a backlight, NTSC can be improved to above 100 %. KSiF phosphors are particularly suitable for use as the second luminescent material 13 of the first luminescent element 11.

[0166] Fig. 9 shows an exemplary lamp 300 comprising a light emitting device 1, 100, 101, 102, 103, 101, 102, 103 according to any embodiment of the invention. The light emitting device of such a lamp may be a light emitting device with any shape, such as, but not limited to, flat, spiral-shaped, helix-shaped, meandering, twisted, flat and combinations thereof.

[0167] The lamp 300 further comprises a driver or controller 305 configured for controlling the one or more (LED) light sources 3, 5, 7, 9, 19 of the light emitting device 1, 100, 101, 102, 103. The controller 305 is configured to power the one or more (LED) light2025PF80064

[0168] 19

[0169] sources 3, 5, 7, 9, 19 via electrical circuitry (not visible on the figures) of the light emitting device 1, 100, 101, 102, 103. The light emitting device 1, 100, 101, 102, 103 may also comprise a controller 30, which may or may not be separate from the controller 305. In other words, the controller 305 and the controller 30 of the light emitting device 1, 100, 101, 102, 103 may be integrated into one and the same driver or controller, or they may be mutually separate units.

[0170] The lamp 300 further comprises an envelope 301 at least partially enveloping the at least one light emitting device 1, 100, 101, 102, 103. The lamp 300 further comprises a cap 303. As shown in Fig. 9, the controller 305 is arranged within the envelope 301. When comprising a cap 303, the controller 305 may also be arranged inside the cap 303 such that it is hidden from view. The lamp 300 further comprises threading 302 for connection to a socket, and a terminal 304 for connection to a source of electrical energy.

[0171] The envelope 301 of the lamp 300 may further and optionally be provided with a coating (not shown), such as a reflective coating, covering at least a part of the envelope 301.

[0172] Turning finally to Fig. 10, an exemplary luminaire in the form of a pendant 400 is shown. The pendant 400 comprises a light emitting device 1, 100, 101, 102, 103 according to any embodiment of the invention. The light emitting device 1, 100, 101, 102, 103 is as shown in Fig. 10 provided within a lamp 300 in the form of a light bulb.

[0173] As is also mentioned above, the light bulb further comprises a transparent envelope (cf. transparent envelope 301 of lamp 300) at least partially enveloping the at least one light emitting device 1, 100, 101, 102, 103. The transparent envelope may be shaped in any feasible shape, for example such as to resemble the shape of any one of a standard light bulb, a globe light bulb, a candlelight bulb, a customized light bulb and even a spiral light bulb. The transparent envelope may comprise a luminescent material. The transparent envelope may be a glass envelope.

[0174] The pendant 400 further comprises a socket 401 for connecting the lamp 300, and thereby the light emitting device 1, 100, 101, 102, 103, to the pendant 400. The socket 401 is adapted to cooperate with the base 303 of the lamp 300. The socket 401 may comprise a threading adapted to cooperate with the threading 302 of the lamp 300. The socket 401 may comprise a terminal adapted to cooperate with the terminal 304 of the lamp 300. The pendant 400 further comprises a reflector or screen 403.

[0175] The pendant 400 may further comprise a driver 402 configured for controlling the light emitting device 1, 100, 101, 102, 103. The driver 402 may or may not be the same2025PF80064

[0176] 20

[0177] unit as the controller 305 described above. In other words, the driver 402 and the controller 305 may be integrated into one and the same driver or controller, or they may be mutually separate units. Alternatively, or additionally, the light emitting device 1, 100, 101, 102, 103 may also comprise a controller 30, which may or may not be separate from one or both of the driver 402 and the controller 305.

[0178] As shown in Fig. 10, the driver 402 is arranged on a reflector or screen 403 of the pendant 400. The driver may also be arranged within or incorporated into the reflector or screen 403. The pendant 400 further comprises an electrical wiring 404 for connection to a source of electricity, such as a mains.

[0179] It is noted that the pendant 400 shown in Fig. 10 is only one example of a luminaire according to the invention. Any suitable type of luminaire may be envisaged, such as but not limited to, a standing luminaire, a wall hung luminaire, a chandelier, a reading luminaire, an outdoor luminaire, and a table luminaire.

[0180] The person skilled in the art realizes that the present invention by no means is limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible within the scope of the appended claims.

[0181] Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage.

Claims

1. 2025PF8006421CLAIMS1. A light emitting device (1) configured to, in operation, emit device light (2), the light emitting device comprising:a first solid-state light source (3) configured to provide, in operation, first light source light (4) having a first peak emission wavelength, I, in a wavelength range from 400 nm to 490 nm and a first full width half maximum, FWHM1, wherein FWHM1 < 40 nm, a second solid-state light source (5) configured to provide, in operation, second light source light (6) having a second peak emission wavelength, X2, in a wavelength range from 400 nm to 490 nm and a second full width half maximum, FWHM2, wherein FWHM2 < 40 nm, and wherein XI and X2 are different by at least 20 nm,at least one of• a third solid-state light source (7) configured to provide, in operation, third light source light (8) having a third peak emission wavelength, X3, in a wavelength range from 565 nm to 600 nm, and• a fourth solid-state light source (9) configured to provide, in operation, fourth light source light (10) having a fourth peak emission wavelength, X4, being above 640 nm, anda first luminescent element (11) arranged in an optical path of the first light source light (4) emitted by the first solid-state light source (3) and the second light source light (6) emitted by the second solid-state light source (5), whereinthe first luminescent element (11) comprises a single first luminescent material (12) being configured to convert a first part of the first light source light (4) into first converted light (14) having a plurality of peak emission wavelengths, Xgl, in a wavelength range from 500 nm to 560 nm, and / or to convert a first part of the second light source light (6) into second converted light (15) having a plurality of peak emission wavelengths, Xg2, in a wavelength range from 500 nm to 560 nm, whereinthe first luminescent element (11) further comprises a second luminescent material (13) being configured to convert a second part of the first light source light (4) into third converted light (16) having a plurality of peak emission wavelengths, Xrl, in a wavelength range from 600 nm to 650 nm, and / or to convert a second part of the second light2025PF8006422source light (6) into fourth converted light (17) having a plurality of peak emission wavelengths, r2, in a wavelength range from 600 nm to 650 nm, and whereinthe device light (2) comprises a combination of (i) at least part of the first light source light (4), (ii) at least part of the second light source light (6), (iii) the first converted light (14), (iv) the second converted light (15), (v) the third converted light (16), (vi) the fourth converted light (17), and (vii) at least one of the third light source light (8) and the fourth light source light (10);wherein, in an operational mode of the light emitting device (1), the device light is white light having a correlated color temperature in a range from 2000 K to 6500 K and a color rendering index of at least 80.

2. A light emitting device according to claim 1, wherein the single first luminescent material (12) is a BaZn2(PO4)2:U6+type of phosphor.

3. A light emitting device according to any one of the above claims, wherein the second luminescent material (13) is a luminescent material of the type M’xM2-2xAX6 doped with tetravalent manganese, wherein M’ comprises an alkaline earth cation, M comprises an alkaline cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, for instance comprising one or more of silicon and titanium, wherein X comprises a monovalent anion, at least comprising fluorine.

4. A light emitting device according to any one of the above claims and comprising both the third solid-state light source (7) configured to provide, in operation, the third light source light (8) having the third peak emission wavelength, 3, in a wavelength range from 565 nm to 600 nm, and the fourth solid-state light source (9) configured to provide, in operation, the fourth light source light (10) having the fourth peak emission wavelength, X4, being above 640 nm, whereinthe device light (2) comprises a combination of (i) at least part of the first light source light (4), (ii) at least part of the second light source light (6), (iii) the first converted light (14), (iv) the second converted light (15), (v) the third converted light (16), (vi) the fourth converted light (17), (vii) the third light source light (8), and (viii) the fourth light source light (10).2025PF80064235. A light emitting device according to any one of the above claims, and further comprising:at least one fifth solid-state light source (19) configured to provide, in operation, fifth light source light (20) having a fifth peak emission wavelength, 5, in a wavelength range from 400 nm to 490 nm and a third full width half maximum, FWHM3, wherein FWHM3 < 40 nm, and wherein I, X2, and X5 are mutually different by at least 20 nm, whereinthe device light (2) further comprises at least part of the fifth light source light.

6. A light emitting device according to claim 5, whereinthe first luminescent element (11) further is arranged in an optical path of the fifth light source light (20) emitted by the at least one fifth solid-state light source (19), whereinthe single first luminescent material (12) further is configured to convert a first part of the fifth light source light (20) into fifth converted light (21) having a plurality of peak emission wavelengths, Xg3, in a wavelength range from 500 nm to 560 nm, whereinthe second luminescent material (13) further is configured to convert a second part of the fifth light source light (20) into sixth converted light (22) having a plurality of peak emission wavelengths, Xr3, in a wavelength range from 600 nm to 650 nm, and wherein the device light (2) further comprises part of the fifth converted light (21) and the sixth converted light (22).

7. A light emitting device according to any one of the above claims, wherein the third solid-state light source (7) and the fourth solid-state light source (9) are direct emitting LED light sources.

8. A light emitting device according to any one of the above claims 1 to 5, wherein one or more of the following applies:the third solid-state light source (7) comprises a first solid-state emitter (71) configured to, in operation, emit first emitter light (72) and a second luminescent element (73) arranged in an optical path of the first emitter light and comprising a third luminescent material (74) configured to convert the first emitter light (72) into the third light source light (8), and2025PF8006424the fourth solid-state light source (9) comprises a second solid-state emitter (91) configured to, in operation, emit second emitter light (92) and a third luminescent element (93) arranged in an optical path of the second emitter light and comprising a fourth luminescent material (94) configured to convert the second emitter light (92) into the fourth light source light (10).

9. A light emitting device according to any one of the preceding claims, wherein:the first luminescent element (11) is further arranged in an optical path of the third light source light (8) emitted by the third solid-state light source (7), andthe first luminescent element (11) is further arranged in an optical path of the fourth light source light (10) emitted by the fourth solid-state light source (9); and wherein the first luminescent element is configured to convert less than 0.5% of the third light source light (8) and the fourth light source light (10).

10. A light emitting device according to claim 9 when dependent on claim 8, wherein one or more of the following applies:the second luminescent element (73) is arranged between the first solid-state emitter (71) and the first luminescent element (11), andthe third luminescent element (93) is arranged between the second solid-state emitter (91) and the first luminescent element (11).

11. A light emitting device according to any one of the above claims, wherein:the first peak emission wavelength, Al is in a wavelength range of 445 nm to 465 nm, andthe second peak emission wavelength, 2, is in a wavelength range of 415 nm to 435 nm.

12. A light emitting device according to any one of the above claims, wherein the light emitting device further comprises a controller (30) configured to individually control the first solid-state light source (3), the second solid-state light source (5), the at least one of, or both of, the third solid-state light source (7) and the fourth solid-state light source (9), and optionally the fifth solid-state light source (19) to vary one or more of the correlated color temperature, CCT, the color point, CP, and the color rendering index, CRI, of the device light (2).2025PF800642513. A light emitting device according to claim 12, wherein the light emitting device (1) further comprises at least one sensor (40) for directly or indirectly sensing at least one characteristic of one or more of the first solid-state light source (3), the second solid-state light source (5), the at least one of, or both of, the third solid-state light source (7) and the fourth solid-state light source (9), and optionally the fifth solid-state light source (19), and whereinthe controller (30) further is configured to receive a signal from the sensor (40), and to individually control the first solid-state light source (3), the second solid-state light source (5), the at least one of, or both of, the third solid-state light source (7) and the fourth solid-state light source (9), and optionally the fifth solid-state light source (19) based on the signal received from the sensor (40).

14. A light emitting device according to claim 12, wherein the light emitting device (1) further comprises at least one sensor (40) for directly or indirectly sensing at least one characteristic of one or more of the intensity and correlated color temperature of ambient light in a room, and whereinthe controller (30) further is configured to receive a signal from the sensor (40), and to individually control the first solid-state light source (3), the second solid-state light source (5), the at least one of, or both of, the third solid-state light source (7) and the fourth solid-state light source (9), and optionally the fifth solid-state light source (19) based on the signal received from the sensor (40).

15. A lamp (300) or a luminaire (400) comprising a light emitting device (1) according to any one of claims 1-13.

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