27 patents
Utility
Narrow-band red photoluminescence materials for solid-state light emitting devices and filaments
10 Oct 23
Light emitting devices and LED-filaments comprise an excitation source (e.g.
Yi-Qun Li
Filed: 8 Nov 22
Utility
LED-filaments and LED-filament lamps
10 Oct 23
An LED-filament comprising: a partially light transmissive substrate; a plurality of LED chips on a front face of the substrate; a photoluminescence material that is in direct contact with and covers all of the plurality of LED chips; and a light scattering layer that is in direct contact with and covers at least the photoluminescence material, wherein the light scattering layer comprises particles of light scattering material, and wherein the photoluminescence material comprises broadband green to red photoluminescence materials and narrowband red photoluminescence material.
Gang Wang, Jun-Gang Zhao, Yi-Qun Li
Filed: 6 Dec 21
Utility
Color liquid crystal displays and display backlights
18 Apr 23
A display backlight, comprises: an excitation source, LED (146), for generating blue excitation light (148) with a peak emission wavelength in a wavelength range 445 nm to 465 nm; and a photoluminescence wavelength conversion layer (152).
Yi-Qun Li, Xianglong Yuan
Filed: 13 Jul 21
Utility
Packaged white light emitting devices comprising photoluminescence layered structure
18 Apr 23
A light emitting device includes a Chip Scale Packaged (CSP) LED, the CSP LED including an LED chip that generates blue excitation light; and a photoluminescence layer that covers a light emitting face of the LED chip, wherein the photoluminescence layer comprises from 75 wt % to 100 wt % of a manganese-activated fluoride photoluminescence material of the total photoluminescence material content of the layer.
Jun-Gang Zhou, Gang Wang, Yi-Qun Li
Filed: 19 Jul 21
Utility
Full spectrum white light emitting devices
7 Feb 23
A full spectrum white light emitting device comprising: a broadband solid-state excitation source operable to generate broadband blue excitation light; and at least one photoluminescence material which generates green to red light, wherein the device generates white light whose intensity over the blue to cyan region of the spectrum has a maximum percentage deviation from the intensity of light of a black-body or CIE Standard Illuminant D of less than 50%.
Yi-Qun Li, Xianglong Yuan, Jun-Gang Zhao
Filed: 20 Sep 21
Utility
Narrow-band red photoluminescence materials for solid-state light emitting devices and filaments
8 Nov 22
Light emitting devices and LED-filaments comprise an excitation source (e.g.
Yi-Qun Li
Filed: 22 Jun 18
Utility
Full spectrum white light emitting devices
25 Oct 22
A full spectrum light emitting device includes photoluminescence materials which generate light with a peak emission wavelength in a range 490 nm to 680 nm (green to red) and a broadband solid-state excitation source operable to generate broadband blue excitation light with a dominant wavelength in a range from 420 nm to 470 nm, where the broadband blue excitation light includes at least two different blue light emissions in a wavelength range 420 nm to 480 nm.
Xianglong Yuan, Yi-Qun Li
Filed: 25 Jun 19
Utility
Color liquid crystal displays and display backlights
13 Sep 22
There is provided a display backlight (604), including an excitation source (644) for generating blue light (650); and a wavelength converter (654) being a unitary construction including a combination of a wavelength selective filter layer (658) bonded to a photoluminescence layer (660), where the photoluminescence layer (658) includes a green photoluminescence material and a red photoluminescence material; and where the wavelength selective filter layer (658) is transmissive to blue light and reflective to green and red light.
Xianglong Yuan, Yi-Qun Li
Filed: 14 Feb 20
Utility
LED-filaments and LED-filament lamps utilizing manganese-activated fluoride red photoluminescence material
24 May 22
An LED-filament comprising: a partially light-transmissive substrate; a plurality of blue LED chips mounted on a front face of the substrate; first broad-band green to red photoluminescence materials and a first narrow-band manganese-activated fluoride red photoluminescence material covering the plurality of blue LED chips and the front face of the substrate; and second broad-band green to red photoluminescence materials covering the back face of the substrate.
Gang Wang, Jun-Gang Zhao, Yi-Qun Li
Filed: 13 Aug 19
Utility
Full spectrum white light emitting devices
21 Sep 21
A full spectrum white light emitting device includes photoluminescence materials which generate light with a peak emission wavelength in a range from about 490 nm to about 680 nm; and a broadband solid-state excitation source operable to generate broadband excitation light with a dominant wavelength in a range from about 420 nm to about 480 nm.
Yi-Qun Li, Xianglong Yuan, Jun-Gang Zhao
Filed: 16 Jun 20
Utility
Color liquid crystal displays and display backlights
13 Jul 21
A display backlight, comprises: an excitation source, LED (146), for generating blue excitation light (148) with a peak emission wavelength in a wavelength range 445 nm to 465 nm; and a photoluminescence wavelength conversion layer (152).
Yi-Qun Li, Xianglong Yuan
Filed: 19 Apr 18
Utility
High gamut index solid-state white light emitting devices
6 Jul 21
A white light emitting device includes a solid-state excitation source operable to generate excitation light having a dominant wavelength ranging from 440 nm to 455 nm; a first photoluminescence material which generates light having a peak emission wavelength ranging from 500 nm to 530 nm; and a second photoluminescence material which generates light having a peak emission wavelength ranging from 640 nm to 690 nm, where the device is operable to generate white light with an IEC TM-30 Gamut Index Rg ranging from 105 to 115.
Xianglong Yuan, Yi-Qun Li
Filed: 28 Jan 20
Utility
Narrow-band red phosphors for LED lamps
29 Jun 21
A light emitting device (LED-Filament) comprises: a light-transmissive substrate; at least one blue LED chip mounted on the light-transmissive substrate, for instance mounted on a face thereof; and a photoluminescence material at least partially covering the at least one blue LED chip.
Yi-Qun Li, Gang Wang
Filed: 14 Jan 20
Utility
Coated narrow band green phosphor
25 May 21
A coated phosphor may comprise: phosphor particles comprised of a phosphor with composition (M)(A)2S4:Eu, wherein: M is at least one of Mg, Ca, Sr and Ba; and A is at least one of Ga, Al, In, Y; a dense impermeable (pinhole-free) coating of an oxide material encapsulating individual ones of the phosphor particles.
Haoguo Zhu, Yi-Qun Li, Kuanping Gong, Samuel Lowell Dunscombe
Filed: 10 Mar 20
Utility
Coated narrow band red phosphor
13 Apr 21
A coated phosphor comprises: phosphor particles comprised of a phosphor with composition MSe1−xSx:Eu, wherein M is at least one of Mg, Ca, Sr, Ba and Zn and 0<x<1.0; and a coating on individual ones of the phosphor particles, the coating comprising a layer of oxide material encapsulating the individual phosphor particles; wherein the coated phosphor is configured such that under excitation by a blue LED the reduction in photoluminescent intensity at the peak emission wavelength after 1,000 hours of aging at about 85° C. and about 85% relative humidity is no greater than about 15%; and wherein the coated phosphor is configured such that the change in chromaticity coordinates CIE(x), Δx, after 1,000 hours of aging at about 85° C. and about 85% relative humidity is less than or equal to about 5×10−3.
Yi-Qun Li, Xiongfei Shen, Haoguo Zhu, Kuanping Gong, Samuel Lowell Dunscombe
Filed: 4 Apr 19
Utility
Tunable LED-filaments and tunable LED-filament lamps
16 Mar 21
An LED-filament includes a light-transmissive substrate; a first array of LED chips on a front face of the substrate; a second array of LED chips on the front face of the substrate; a first photoluminescence arrangement covering the first array of LED chips; and a second photoluminescence arrangement covering the second array of LED chips; where the first array of LED chips and the first arrangement generate light of a first color temperature and the second array of LED chips and the second arrangement generate light of a second color temperature.
Yi-Qun Li, Gang Wang, Jun-Gang Zhao
Filed: 4 Jun 20
Utility
High color rendering white light emitting devices and high color rendering photoluminescence compositions
23 Nov 20
A exemplary light emitting device includes an excitation source operable to generate excitation light with a dominant wavelength in a range 450 nm to 470 nm; a red photoluminescence material which generates light with a peak emission wavelength in a range 600 nm to 620 nm with a full width at half maximum emission intensity greater than 70 nm and less than 80 nm; a yellow to green photoluminescence material which generates light with a peak emission wavelength in a range 530 nm to 550 nm; and a narrow-band red photoluminescence material which generates light with a peak emission wavelength in a range 625 nm to 635 nm with a full width at half maximum emission intensity greater than about 5 nm and less than about 25 nm.
Gang Wang, Yi-Qun Li
Filed: 5 May 19
Utility
Full spectrum white light emitting devices
16 Nov 20
A full spectrum white light emitting device may include a broadband solid-state excitation source for generating broadband excitation light with a dominant wavelength from about 420 nm to about 480 nm and a full width at half maximum intensity greater than about 25 nm; and a narrowband red photoluminescence material with an emission peak wavelength from about 620 nm to about 640 nm and a full width at half maximum emission intensity of less than about 30 nm; where the device has an efficacy of at least 130 lm/W and generates white light with a CRI Ra≥90, and where over a wavelength range from about 430 nm to about 520 nm, a maximum percentage intensity deviation of the white light from the intensity of light of a black-body curve or CIE Standard Illuminant D of the same Correlated Color Temperature is less than about 50%.
Yi-Qun Li, Xianglong Yuan, Jun-Gang Zhao
Filed: 22 Jun 20
Utility
Full spectrum white light emitting devices
15 Jun 20
A full spectrum white light emitting device comprises: photoluminescence materials which generate light with a peak emission wavelength in a range from about 490 nm to about 680 nm; and a broadband solid-state excitation source operable to generate broadband excitation light with a dominant wavelength in a range from about 420 nm to about 480 nm.
Yi-Qun Li, Xianglong Yuan, Jun-Gang Zhao
Filed: 18 Jul 19
Utility
Solid-state light emitting devices and signage with photoluminescence wavelength conversion and photoluminescent compositions therefor
23 Mar 20
A photoluminescent composition (“phosphor ink”) comprises a suspension of particles of at least one blue light (380 nm to 480 nm) excitable phosphor material in a light transmissive liquid binder in which the weight loading of at least one phosphor material to binder material is in a range 40% to 75%.
Xianglong Yuan, Bing Dai, Jonathan Melman, Charles Edwards
Filed: 2 Aug 17