Packaging Technologies and Luminescence Properties of Ce:YAG Single Crystal for White Light-emitting Diode

doi:10.3724/SP.J.1077.2014.13481

Abstract

Abstract:

The Ce:YAG single crystal for white light-emitting diode (WLED) application was grown by the Czochralski method. The thermal stability and optical properties of samples were characterized by absorption spectrum, photoluminescence spectra and temperature-dependent PL spectra. The photoelectric performance of WLEDs fabricated by the Ce:YAG single crystal were also measured. It is found that the Ce:YAG single crystal shows a broad emission band from 500 nm to 700 nm under blue light (wave length 466 nm). Absorption peaks, located at 202, 219, 247.3, 347.4 and 455.5 nm, are due to 4f→5d transition, and the energy of 5d orbits is divided into 21954, 29154, 40437, 45662 and 49505 cm^-1. As the temperature increases, the PL intensity is reduced because of a higher energy of the ²F_7/2, and the damping upon PL intensity by the Ce:YAG single crystal (13.28%) are much lower than that by commercially available phosphors (30%). When the current is at a standard state and the luminous flux of emission blue light is around 3.7 lm, the most suitable thickness for the Ce:YAG single crystal is 0.5 mm. Since the WLED fabricated by the Ce:YAG single crystal prepared in present work meets all requirements in related GB codes, and its performance is better in comparison with that of the commercially available one, the Ce:YAG single crystal will possibly be used to fabricate new-type WLED devices.

Key words: WLED, yttrium aluminum garnet doped with Ce, luminescence property, packaging technology, photoelectric property

CLC Number:

O734

XIANG Wei-Dong, ZHAO Bin-Yu, LIANG Xiao-Juan, CHEN Zhao-Ping, XIE Cui-Ping, LUO Le, ZHANG Zhi-Min, ZHANG Jing-Feng, ZHONG Jia-Song. Packaging Technologies and Luminescence Properties of Ce:YAG Single Crystal for White Light-emitting Diode[J]. Journal of Inorganic Materials, 2014, 29(6): 614-620.

Figures/Tables 11

References 34

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Samples	Current<br/>/mA	Luminous flux<br/>/lm	Luminous efficacy<br/>/(lm•W^-1)	Colour coordinate (x,y)	Colour temperature<br/>/K
M₁ chip	60	2.687	13.995	0.1540,0.0240	1682
M₂ chip		3.513	18.071	0.1528,0.0268	1665
M₁ chip covered with<br/>epoxy glue		3.689	19.898	0.1552,0.0331	1649
M₂ chip covered with<br/>epoxy glue		3.714	18.533	0.1551,0.0299	1661

Samples	Current<br/>/mA	Luminous flux<br/>/lm	Luminous efficacy<br/>/(lm•W^-1)	Colour coordinate (x,y)	Colour temperature<br/>/K
M₁ chip	60	2.687	13.995	0.1540,0.0240	1682
M₂ chip		3.513	18.071	0.1528,0.0268	1665
M₁ chip covered with<br/>epoxy glue		3.689	19.898	0.1552,0.0331	1649
M₂ chip covered with<br/>epoxy glue		3.714	18.533	0.1551,0.0299	1661

Samples	Thick-ness<br/>/mm	Current<br/>/mA	Luminous efficacy<br/>/(lm•W^-1)	Colour coordinate<br/>(x,y)	Colour temperature<br/>/K	Colour-rendering index
WLEDs fabricated by the Ce:YAG single crystal (z=0.04) and M₁ chip	0.5	20	149.028	0.3157,0.3711	6148	66.4
		60	121.466	0.3145,0.3636	6225	67.0
		100	101.316	0.3130,0.3584	6316	67.4
		200	69.415	0.3107,0.3522	6453	67.7
		350	48.643	0.3098,0.3510	6501	68.3
WLEDs fabricated by the Ce:YAG single crystal (z=0.04) and M₂ chip		20	138.617	0.3332,0.4072	5484	63.7
		60	117.950	0.3313,0.3973	5543	64.8
		100	103.093	0.3295,0.3918	5603	65.5
		200	68.295	0.3271,0.3857	5689	66.1
		350	47.530	0.3256,0.3863	5743	67.3

Samples	Thick-ness<br/>/mm	Current<br/>/mA	Luminous efficacy<br/>/(lm•W^-1)	Colour coordinate<br/>(x,y)	Colour temperature<br/>/K	Colour-rendering index
WLEDs fabricated by the Ce:YAG single crystal (z=0.04) and M₁ chip	0.5	20	149.028	0.3157,0.3711	6148	66.4
		60	121.466	0.3145,0.3636	6225	67.0
		100	101.316	0.3130,0.3584	6316	67.4
		200	69.415	0.3107,0.3522	6453	67.7
		350	48.643	0.3098,0.3510	6501	68.3
WLEDs fabricated by the Ce:YAG single crystal (z=0.04) and M₂ chip		20	138.617	0.3332,0.4072	5484	63.7
		60	117.950	0.3313,0.3973	5543	64.8
		100	103.093	0.3295,0.3918	5603	65.5
		200	68.295	0.3271,0.3857	5689	66.1
		350	47.530	0.3256,0.3863	5743	67.3

Samples	Thickness<br/>/mm	Current<br/>/mA	Luminous efficacy<br/>/(lm•W^-1)	Colour coordinate <br/>(x,y)	Colour temperature<br/>/K	Colour-rendering index
WLEDs fabricated <br/>by the Ce:YAG single crystal (z=0.04) <br/>and M₂ chip	0.4	60	76.744	0.2641,0.2580	15424	75.3
	0.5		91.082	0.3362,0.4113	5395	64.3
	1		91.748	0.3796,0.4934	4547	60.0
	1.5		84.435	0.3772,0.4853	4570	60.7