Intense Yellow Emission from Gd0.5-yTb1.5REyW3O12 (RE=Eu, Sm) Phosphors Tuned through Full Range Doping

doi:10.15541/jim20180522

Abstract

Abstract:

Yellow emission phosphors play an important role in fabrication of near ultraviolet (NUV) chip pumped white light emitting diodes (W-LEDs). In this study, doping of Gd₂W₃O₁₂ host with Tb ³⁺ and Eu ³⁺/Sm ³⁺ were used for obtaining yellow light emission. The excitation of Gd ³⁺ typically is in deep ultraviolet region, but Gd ³⁺ in Gd₂W₃O₁₂ does not emit under the excitation of 382 nm, thus Gd ³⁺ does not interfere with the emission from Tb ³⁺ and Eu ³⁺/Sm ³⁺ for obtaining yellow emission. Due to the similar ionic radii, the doping of Gd ³⁺ by Tb ³⁺ can be achieved in the full concentration range, and at the optimal concentration of 75mol% Tb ³⁺, green emission with reasonably high internal quantum efficiency of 37.6% was obtained. With the optimal doping concentration of Tb ³⁺, Eu ³⁺/Sm ³⁺ was co-doped in the Gd₂W₃O₁₂ host, and bright yellow emission with IQE of 39.6% and 47.8% were obtained. The yellow phosphors of Gd_0.494Tb_1.5Eu_0.006W₃O₁₂ and Gd_0.494Tb_1.5Sm_0.006W₃O₁₂ were used to fabricate W-LED devices with NUV-blue chips. Thus, Gd_0.5-_yTb_1.5RE_yW₃O₁₂ (RE=Eu, Sm) phosphors are candidates as the yellow phosphors for fabricating W-LED devices. Additionally, the full-range doping strategy can be used in other systems for obtaining efficient phosphors.

Key words: solid state synthesis, photoluminescence, tungstate, rare earth, internal quantum efficiency

CLC Number:

TQ174

DAI Yan-Nan, YANG Shuai, SHEN Yang, SHAN Yong-Kui, YANG Fan, ZHAO Qing-Biao. Intense Yellow Emission from Gd_0.5-_yTb_1.5RE_yW₃O₁₂ (RE=Eu, Sm) Phosphors Tuned through Full Range Doping[J]. Journal of Inorganic Materials, 2019, 34(11): 1210-1216.

Figures/Tables 8

Fig. 1 (a) The polyhedron models of the crystal structure of Gd2W3O12 from perspectives of x axis, (b) the one-dimensional chain structure of [GdO8] polyhedrons

Fig. 2 XRD patterns of Gd2W3O12, TbGdW3O12 and Tb2W3O12

Fig. 3 (a) The excitation spectra of Gd2-xW3O12: xTb3+ (x= 0.25, 0.75, 1.0, 1.25, 1.5, 1.75, 2.00) monitored with 549 nm emission; (b) The concentration dependent excitation intensity of 7F6→5D4 transition of Tb3+ at 382 nm in Gd2-xW3O12: x Tb3+ (a) Coloful spectra are available on website

Fig. 4 (a) The emission spectra of Gd2-xW3O12: xTb3+ (x=0.25, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00) phosphors under 382 nm ultraviolet excitation; (b) The concentration dependent 549 nm emission intensity of Gd2-xW3O12: xTb3+ (where x=0.25, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00) phosphors

Fig. 5 (a, b) The excitation spectra of Gd0.5-yTb1.5REyW3O12 (RE=Eu, Sm), (c, d) the emission spectra of Gd0.5-yTb1.5REyW3O12 (RE=Eu, Sm) with 382 nm excitation Colourful spectra are available on website

Sample	λ_ex/nm	IQE	CIE coordinates (x, y)
YAG: Ce³⁺ (Nichia, Japan)	430	~90%	Yellow
Sr₃AlO₄F: Ce^3+[28]	430	84%	Yellow
Gd₃Al₂Ga₃O₁₂: Ce^3+[29]	435	81.9%	Yellow
La₃Si₆N₁₁: Ce^3+[30]	450	78.6%	(0.422, 0.553)
LuVO₄: Bi^3+[31]	305	68%	Yellow
Tb_2.82Ce_0.09Eu_0.09Al₅O₁₂^[32]	460	40%	Yellow
Sr₃Lu_0.95Ce_0.05Al₂O_7.5^[33]	450	41%	(0.454, 0.533)
Ca_1.5Mn_0.5Gd_7.6Ce_0.4(SiO₄)₆O₂^[34]	330	33.9%	(0.552, 0.423)
NaSc_0.75Mn_0.20Eu_0.05Si₂O₆^[35]	365	33%	(0.431, 0.465)
La_0.90Tb_0.08Eu_0.02NbO₄^[36]	261	30%	(0.473, 0.500)
Gd_0.86Eu_0.12Tb_0.02NbO₄^[37]	260	21.1%	Yellow
Gd_0.494Tb_1.5Sm_0.006W₃O₁₂(This work)	382	47.8%	(0.510, 0.456)
Gd_0.494Tb_1.5Eu_0.006W₃O₁₂(This work)	382	39.6%	(0.491, 0.472)

Fig. 6 The 1931 CIE coordinates diagram of (a) Gd2-xTbxW3O12 (x=0, 0.25, 0.75, 1.00, 1.25, 1.50, 1.75, and 2.00), (b) Gd0.5-yTb1.5EuyW3O12 (y=0, 0.002, 0.004, 0.006, 0.008, 0.010, and 0.020) and (c) Gd0.5-yTb1.5SmyW3O12 (y=0, 0.002, 0.004, 0.006, 0.008, 0.010, and 0.020). The inserts in (b) and (c) are W-LED (1W), which was fabricated by Gd0.494Tb1.5Eu0.006W3O12 or Gd0.494Tb1.5Sm0.006W3O12 phosphors and NUV-blue chip, respectively

Samples	y (Eu³⁺)	CIE coordinates (x, y)	y (Sm³⁺)	CIE coordinates (x, y)
1	0	(0.140, 0.562)	0	(0.140, 0.562)
2	0.002	(0.416, 0.529)	0.002	(0.430, 0.516)
3	0.004	(0.468, 0.490)	0.004	(0.476, 0.480)
4	0.006	(0.491, 0.472)	0.006	(0.510, 0.456)
5	0.008	(0.501, 0.459)	0.008	(0.497, 0.460)
6	0.010	(0.518, 0.444)	0.010	(0.508, 0.450)
7	0.020	(0.572, 0.400)	0.020	(0.528, 0.423)

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Intense Yellow Emission from Gd_0.5-_yTb_1.5RE_yW₃O₁₂ (RE=Eu, Sm) Phosphors Tuned through Full Range Doping

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