Achieving High Light Uniformity Laser-driven White Lighting Source by Introducing Secondary Phases in Phosphor Converters

Taoli DENG; Hexin CHEN; Lingli HEI; Shuxing LI; Rongjun XIE

doi:10.15541/jim20220074

Journals >Journal of Inorganic Materials >Volume 37 >Issue 8 >Page 891 > Article

Journal of Inorganic Materials
Vol. 37, Issue 8, 891 (2022)

Achieving High Light Uniformity Laser-driven White Lighting Source by Introducing Secondary Phases in Phosphor Converters

Taoli DENG^1、2, Hexin CHEN¹, Lingli HEI¹, Shuxing LI^1、*, and Rongjun XIE^1、*

Author Affiliations

¹1. State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials, Xiamen University, Xiamen 361005, China

²2. College of Chemistry and Chemical Engineering, Anshun University, Anshun 561000, China

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DOI: 10.15541/jim20220074 Cite this Article

Taoli DENG, Hexin CHEN, Lingli HEI, Shuxing LI, Rongjun XIE. Achieving High Light Uniformity Laser-driven White Lighting Source by Introducing Secondary Phases in Phosphor Converters[J]. Journal of Inorganic Materials, 2022, 37(8): 891 Copy Citation Text

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(a-e) Cross-section and (f-j) top-view SEM images of (a, f) YAG, (b, g)YAG-TiO2, (c, h) YAG-BN, (d, i)YAG-Al2O3, (e, j) YAG-SiO2 PiG films; (k-o) SEM image of the selected area of the YAG-TiO2 PiG film and corresponding EDS mappings of Y, Al, Ca and Ti

1. (a-e) Cross-section and (f-j) top-view SEM images of (a, f) YAG, (b, g)YAG-TiO₂, (c, h) YAG-BN, (d, i) YAG-Al₂O₃, (e, j) YAG-SiO₂PiG films; (k-o) SEM image of the selected area of the YAG-TiO₂PiG film and corresponding EDS mappings of Y, Al, Ca and Ti

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(a-e) Illumination images of laser-driven white light sources from YAG, YAG-TiO2, YAG-BN, YAG-Al2O3, and YAG-SiO2 PiG films under excitation of a laser power density of 1.72 W/mm2, and (f-j) Speckle images of YAG, YAG-TiO2, YAG-BN, YAG-Al2O3, and YAG-SiO2 PiG films under 445 nm laser excitation

2. (a-e) Illumination images of laser-driven white light sources from YAG, YAG-TiO₂, YAG-BN, YAG-Al₂O₃, and YAG-SiO₂ PiG films under excitation of a laser power density of 1.72 W/mm², and (f-j) Speckle images of YAG, YAG-TiO₂, YAG-BN, YAG-Al₂O₃, and YAG-SiO₂ PiG films under 445 nm laser excitation

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3. (a) Luminance of light spots in YAG, YAG-TiO₂, YAG-BN, YAG-Al₂O₃, and YAG-SiO₂ PiG films under excitation with a laser power of 0.015 W, respectively, (b) luminance distribution curves along the light spot diameter, and (c) photograph of the light spot at a distance of 10 m when the YAG-BN PiG film pumped by a blue LD

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4. (a) CCT and (b) illuminance distribution curves at different angles (10°-170°) of YAG, YAG-TiO₂, YAG-BN, YAG-Al₂O₃, and YAG-SiO₂PiG films

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5. (a) Quantum efficiency and absorption efficiency, (b) luminous flux, and (c) luminous efficacy of YAG, YAG-TiO₂, YAG-BN, YAG-Al₂O₃, and YAG-SiO₂PiG films

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S1. CCT (a) and illuminance (b) distribution curves at different angles (10°~170°) of YAG PiG films with different TiO₂, BN, Al₂O₃, or SiO₂ contents

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S2. Photoluminescence spectra and lifetime of YAG, YAG-TiO₂, YAG-BN, YAG-Al₂O₃, YAG-SiO₂PiG films

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S3. Temperatures of light spots of YAG, YAG-TiO₂, YAG-BN, YAG-Al₂O₃, YAG-SiO₂PiG films

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Uni_CCT/%	0	10%	15%	20%	25%	30%
TiO₂	10.4	91.5	94.3	94.8	91	91
BN	10.4	73.6	86.9	88.4	94.1	90.9
Al₂O₃	10.4	18.1	-	84.2	-	89.3
SiO₂	10.4	12.1	13.7	19.4	16.2	48.3

Table 1.

CCT uniformity of YAG PiG films with different TiO₂, BN, Al₂O₃, or SiO₂contents under blue laser excitation

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Sample	None	SiO₂	Al₂O₃	TiO₂	BN
$\bar{x}$ /(Mcd·m^–2)	0.51	0.25	0.22	0.12	0.11
σ	1260	554	461	248	205

Table 1.

Luminance uniformity of YAG-based PiG films with different scattering media

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Sample	None	SiO₂	Al₂O₃	BN	TiO₂
Max/K	100000	50780	6720	7124	6620
Min/K	4745	6798	5193	5287	5073
Ave/K	45565	14080	5815	5621	5353
Uni/%	10.4	48.3	89.3	94.1	94.8

Table 2.

CCT uniformity of YAG, YAG-TiO₂, YAG-BN, YAG-Al₂O₃, YAG-SiO₂ PiG films under blue laser excitation

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	SiO₂	Al₂O₃	BN	TiO₂
n₂	1.48	1.76	1.73	2.61
R	0.000045	0.0064	0.0051	0.073

Table 3.

Relative refractive indexes of secondary phases introduced into the YAG-PiG film

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