Luminescence of Tb3+/Eu3+ codoped LiYF4 single crystals under UV excitation for white-light LEDs

Yongzhang Jiang; Haiping Xia; Shuo Yang; Jiazhong Zhang; Dongsheng Jiang; Cheng Wang; Zhigang Feng; Jian Zhang; Xuemei Gu; Jianli Zhang; Haochuan Jiang; Baojiu Chen

doi:doi:10.3788/COL201513.071601

Chinese Optics Letters, 2015, 13 (7): 071601, Published Online: Sep. 14, 2018

Luminescence of Tb³⁺/Eu³⁺ codoped LiYF₄ single crystals under UV excitation for white-light LEDs

Yongzhang Jiang ¹Haiping Xia ^1,*Shuo Yang ¹Jiazhong Zhang ¹Dongsheng Jiang ¹Cheng Wang ¹Zhigang Feng ¹Jian Zhang ¹Xuemei Gu ¹Jianli Zhang ¹Haochuan Jiang ²Baojiu Chen ³

Author Affiliations

¹ Key Laboratory of Photo-Electronic Materials, Ningbo University, Ningbo 315211, China

² Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315211, China

³ Department of Physics, Dalian Maritime University, Dalian 116026, China

Figures & Tables

Fig. 1. Powder XRD pattern of Tb3+/Eu3+ co-doped LiYF4 crystal (TE0). The standard pattern of the LiYF4 crystal is shown. Inset, LiYF4 single crystal (TE0).

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Fig. 2. Absorption spectra of Samples T0 and TE0, and the un-doped crystals (marked a, b, and c, respectively).

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Fig. 3. Emission spectra of Samples T0 and TE0 under 374 nm excitation.

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Fig. 4. Excitation spectra of Sample TE0 monitored at 487, 542, and 611 nm wavelengths.

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Fig. 5. Emission spectra of Sample TE0 under various excitation wavelengths (353, 362, 374, and 384 nm).

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Fig. 6. Emission spectra of various Tb3+/Eu3+ co-doped LiYF4 crystals under 384 nm excitation.

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Fig. 7. CIE chromaticity coordinates diagram for Samples TEi (i=0–4) under 384 nm excitation.

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Table1. Concentrations of Tb3+ and Eu3+ Ions in LiYF4 Single Crystalsa

Symbols	T0	TE0	TE1	TE2	TE3	TE4
Tb	0.85	0.84	0.95	1.10	1.11	1.11
Eu	0	0.60	0.60	0.61	0.75	0.90

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Table2. Luminous Parameters of Samples TEia

	Luminous Parameters
Samples	$CIE (x, y)$		$T_{c}$ (K)	$R_{a}$	$Q_{a}$
TE0	0.3130	0.3377	6441	76	75
TE1	0.3027	0.3480	6904	68	60
TE2	0.3051	0.3577	6713	64	66
TE3	0.3120	0.3555	6399	70	67
TE4	0.3242	0.3389	5878	77	75

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Yongzhang Jiang, Haiping Xia, Shuo Yang, Jiazhong Zhang, Dongsheng Jiang, Cheng Wang, Zhigang Feng, Jian Zhang, Xuemei Gu, Jianli Zhang, Haochuan Jiang, Baojiu Chen. Luminescence of Tb³⁺/Eu³⁺ codoped LiYF₄ single crystals under UV excitation for white-light LEDs[J]. Chinese Optics Letters, 2015, 13(7): 071601.

Luminescence of Tb³⁺/Eu³⁺ codoped LiYF₄ single crystals under UV excitation for white-light LEDs

Fig. 1. Powder XRD pattern of Tb3+/Eu3+ co-doped LiYF4 crystal (TE0). The standard pattern of the LiYF4 crystal is shown. Inset, LiYF4 single crystal (TE0).

Fig. 2. Absorption spectra of Samples T0 and TE0, and the un-doped crystals (marked a, b, and c, respectively).

Fig. 3. Emission spectra of Samples T0 and TE0 under 374 nm excitation.

Fig. 4. Excitation spectra of Sample TE0 monitored at 487, 542, and 611 nm wavelengths.

Fig. 5. Emission spectra of Sample TE0 under various excitation wavelengths (353, 362, 374, and 384 nm).

Fig. 6. Emission spectra of various Tb3+/Eu3+ co-doped LiYF4 crystals under 384 nm excitation.

Fig. 7. CIE chromaticity coordinates diagram for Samples TEi (i=0–4) under 384 nm excitation.

Table1. Concentrations of Tb3+ and Eu3+ Ions in LiYF4 Single Crystalsa

Table2. Luminous Parameters of Samples TEia

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