Phosphor Ceramics for High-power Solid-state Lighting

doi:10.15541/jim20200652

Abstract

Abstract:

Due to high power, high brightness, small size, energy saving, and environment friendliness, solid-state lighting has been becoming the most promising lighting technology in this century. As the key material of solid-state lighting, the luminescent properties of phosphors directly determine the crucial parameters such as the color rendering index, luminous efficacy and reliability of solid-state lighting devices. Compared with single crystals, phosphor glasses, phosphor films and quantum-well LEDs, phosphor ceramics have become the most excellent phosphor materials for high-power solid-state lighting due to its excellent thermal and optical properties and easy control of microstructure. In the future, phosphor ceramics is expected to be more widely used and developed in automotive headlights, outdoor lighting, laser TVs, laser cinema projectors, and other fields, and have a broad market prospect. In this review, design principles of high-power solid-state lighting phosphor ceramics are put forward firstly, and then their research progress of oxide phosphor ceramics (mainly refers to Y₃Al₅O₁₂) and nitrogen/oxynitride phosphor ceramics are reviewed mainly. Finally, the development of phosphor ceramics for high-power solid-state lighting is prospected.

Key words: solid-state lighting, phosphor ceramics, yttrium aluminum garnet, nitrogen/oxynitrides, review

CLC Number:

TQ174

PENG Xinglin, LI Shuxing, LIU Zehua, YAO Xiumin, XIE Rongjun, HUANG Zhengren, LIU Xuejian. Phosphor Ceramics for High-power Solid-state Lighting[J]. Journal of Inorganic Materials, 2021, 36(8): 807-819.

Figures/Tables 8

Fig. 1 Schematic of light conversion and propagation in monolithic (a) and composite (b) ceramics[18]

Fig. 2 Al2O3-YAG:Ce composite phosphor ceramics[11] (a) SEM image of the Al2O3-YAG:Ce composite ceramics; (b) Laser irradiation spot temperature of the ceramics varies with different Al2O3 contents; (c) Temperature distribution curves; (d) Thermal conductivity as a function of Al2O3 content; (e) Thermal conductivity as a function of the temperature; (f) Temperature-dependent integrated emission intensity of the composite ceramics Colorful figures are available on website

Table 1 Doping ions and ionic radii of garnet phosphor ceramics at different lattice positions

Doped ions	Ion radius/nm	Occupied lattice	Ref.
Y³⁺	0.1019	A	[38]
Gd³⁺	0.1053	A	[26]
Tb³⁺	0.104	A	[45]
Lu³⁺	0.0977	A	[46]
Mg²⁺	0.089	A	[27]
Sc³⁺	0.087	A	[43]
Al³⁺	0.0535	B	[38]
Sc³⁺	0.0745	B	[43]
Mg²⁺	0.072	B	[44]
Ga³⁺	0.062	B	[26]
Al³⁺	0.039	C	[38]
Si⁴⁺	0.026	C	[44]

Fig. 3 YMASG:Ce phosphor ceramics[44] (a) PLE spectra; (b) PL spectra; (c) Peak wavelength and FWHM; (d) Chromaticity color coordinates colorful figures are available on website

Fig. 4 PL and PLE spectra of YAG:Ce3+/Pr3+/Cr3+phosphor ceramics[29] (a) YAG:Ce; (b) YAG:Pr; (c) YAG:Cr; (d) YAG:Ce,Pr; (e) YAG:Ce,Cr; (f) YAG:Ce,Pr,Cr

Table 2 Summary of three methods for improving CRI and reducing CCT of garnet type phosphor ceramics

Methods	Composition	Emission peak position/nm	CCT/K	CRI	Ref.
Adjust matrix chemical composition	GdYAG:Ce	525-554	2968-4299	64.8	[40]
	GdYAG:Ce	528-550	3688-4782	67.1	[51]
	Al₂O₃-GdYAG:Ce	550*	5010	71.4	[52]
	MgAl₂O₄-GdYAG:Ce	550*	4543	70	[18]
	TbAG:Ce	556-564	4000-4900	-	[45]
	Al₂O₃-TbAG:Ce	555	3580	63	[53]
	TGAG:Ce	550-570	3681	74.7	[25]
	GAGG:Ce	568-574	3000	78.9	[26]
	GAGG:Ce	570	2800	58.7	[47]
	YMASG:Ce	537-577	4384	81	[27]
	YMASG:Ce	533-598	2018-4516	-	[44]
	Al₂O₃-YMASG:Ce	552-610	4860	82.5	[54]
Adjust the luminescencecenter	YAG:Ce³⁺/Pr³⁺	535, 564, 609, 637	-	66.9	[30]
	YAG:Ce³⁺/Cr³⁺	534, 677, 688, etc.	-	72	[31]
	YAG:Ce³⁺/Cr³⁺	530, 690, 705	4329	-	[50]
	YAG:Ce³⁺/Pr³⁺/Cr³⁺	530, 609, 689, etc.	-	78	[29]
	YAG:Ce³⁺/Mn²⁺	520-590	3870-5196	82.5	[28]
	YAG:Ce³⁺/Dy³⁺	496, 582, etc.	5609	-	[55]
	LuAG:Dy³⁺	482, 583, 675,etc.	3485-3619	-	[56]
Composite red fluorescent material	LuAG:Ce/(Sr,Ca)AlSiN₃:Eu	515, 640	4450	94	[33]
	LuAG:Ce/Eu-doped nitride	565-587	5800	89.4	[48]
	YAG:Ce/Sr₂Si₅N₈:Eu	610*	3952	82	[35]
	Al₂O₃-YAG:Ce/Red QD	552, 634	3161-6035	80	[49]

Fig. 5 CaAlSiN3:Eu2+ phosphor ceramics[6, 58] (a) Single CaAlSiN3: Eu2+ grain CL spectral line scan; (b) CL spectra; (c) Crystal structure transition; (d) Core-shell structure schematic diagram; (e) Quantum efficiency of samples; (f) Thermal stability of samples with different Si 3N4 and SiO2 contents; (g) Influence of incident power density on luminous flux; (h) Luminous efficiency of samples Colorful figures are available on website

Fig. 6 Light-transmitting area and refractive index of common transparent ceramics[17] Colorful figures are available on website

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