Luminescence Characteristics of Ce: YAG Ceramic Phosphors with Gd3+ Doping for White Light-emitting Diodes

doi:10.15541/jim20170616

Abstract

Abstract:

Ce:YAG ceramic phosphor has outstanding thermal conductivity and chemical stability for application in white light-emitting diodes (WLEDs), thus has a broader application than organic packaging in high-power WLEDs. (Gd,Y)₃Al₅O₁₂:Ce ceramic phosphors of varying Gd³⁺ concentrations were fabricated through solid-state reactive sintering method. Through X-ray diffraction, scanning electron microscopy, and fluorescence spectroscopy, the crystal structures, influence of the Gd concentration on fluorescence spectra of Ce:YAG, and luminescence properties of WLEDs with (Gd,Y) ₃Al₅O₁₂:Ce ceramic phosphors were investigated. As Gd content increased, the Gd³⁺ replaced the lattice position of Y³⁺ into the lattice. The absorption of blue light and relative photoluminescence (PL) intensity of the (Gd,Y)₃Al₅O₁₂:Ce ceramic phosphors decreased as Gd content increased, leading to a reduction in the luminous efficacy from 81.45l m/W to 63.70l m/W. Moreover, the PL emission bands of (Gd,Y)₃Al₅O₁₂:Ce exhibited redshift from 534 nm toward 564 nm and resulted in increase of the color, rendering index from 61.3 to 70.2. Although doping of Gd decreases the luminous efficacy, the color rendering index of the (Gd,Y)₃Al₅O₁₂:Ce sample is significantly increased, and the performance of the yellow YAG ceramic phosphor applied to the white LED is improved.

Key words: Ce: YAG, ceramic phosphor, WLED, CRI

CLC Number:

TQ174

SHAO Xiu-Chen, ZHOU Sheng-Ming, TANG Yan-Ru, YI Xue-Zhuan, HAO De-Ming, CHEN Jie. Luminescence Characteristics of Ce: YAG Ceramic Phosphors with Gd³⁺ Doping for White Light-emitting Diodes[J]. Journal of Inorganic Materials, 2018, 33(10): 1119-1123.

Figures/Tables 9

Table 1 Percentage of Gd concentration in Ce:Gd:YAG

Sample	D1	D2	D3	D4
x	5at%	10at%	15at%	20at%

Fig. 1 XRD patterns of samples with different Gd3+ concentrations

Table 2 Lattice constants for samples with different Gd3+ contents

Gd content	Lattice constants/nm	E_sd/nm	V/nm³
5at%	1.198348	0.0002516	1.72087
10at%	1.200020	0.0001368	1.72809
15at%	1.200285	0.0002189	1.72923
20at%	1.200379	0.0001519	1.72964

Fig. 2 SEM images of the Ce:Gd:YAG ceramic phosphor plates

Fig. 3 Absorption spectra of the Ce:Gd:YAG phosphor ceramics in 250 nm-525 nm region

Fig. 4 PL spectra of the Ce:Gd:YAG phosphor ceramics

Fig. 5 PL spectra of the Ce:Gd:YAG phosphor ceramics with different thicknesses

Table 3 Crystal cell quantity of the samples

Sample	D1	D1	D1	D4	D4	D4
Thickness/mm	0.2	0.3	0.4	0.2	0.24	0.3
Cell number	1668964	2503446	3337928	1666140	1999369	2499211

Fig. 6 Luminous efficacy and Ra as a function of the Gd3+ content for samples under blue light chip excitation

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Luminescence Characteristics of Ce: YAG Ceramic Phosphors with Gd³⁺ Doping for White Light-emitting Diodes

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