Energy transfer between Ce3+ and Sm3+ in Zn2GeO4 phosphor with the native defects for light-emitting diodes

Yushuang Qi; Lei Zhao; Wenjuan Bian; Xue Yu; Xuhui Xu; Jianbei Qiu

doi:10.3788/COL201715.081601

Chinese Optics Letters, Volume. 15, Issue 8, 081601(2017)

Energy transfer between Ce³⁺ and Sm³⁺ in Zn₂GeO₄ phosphor with the native defects for light-emitting diodes

Yushuang Qi¹, Lei Zhao², Wenjuan Bian¹, Xue Yu^1,3、*, Xuhui Xu^1,3, and Jianbei Qiu^1,3

Author Affiliations

¹College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

²Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji 721016, China

³Key Laboratory of Advanced Materials of Yunnan Province, Kunming 650093, China

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Figures & Tables(8)

Fig. 1. (a) XRD patterns of ${Zn}_{1.99} {GeO}_{4} : 0.01 {Sm}^{3 +}$ , ${Zn}_{1.96} {GeO}_{4} : 0.04 {Ce}^{3 +}$ , ${Zn}_{1.95} {GeO}_{4} : 0.04 {Ce}^{3 +}$ , $0.01 {Sm}^{3 +}$ , and the JCPDS card of ${Zn}_{2} {GeO}_{4}$ (No.11-0687), (b) XPS of ${Zn}_{1.96} {GeO}_{4} : 0.04 {Ce}^{3 +}$ , and the inset is the enlargement of the XPS spectrum from 860 to 900 eV.

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Fig. 2. (a) PLE and PL spectra of ${Zn}_{2} {GeO}_{4}$ , (b) ${Zn}_{1.99} {GeO}_{4} : 0.01 {Sm}^{3 +}$ , (c) ${Zn}_{1.96} {GeO}_{4} : 0.04 {Ce}^{3 +}$ , and (d) ${Zn}_{1.95} {GeO}_{4} : 0.04 {Ce}^{3 +}$ , $0.01 {Sm}^{3 +}$ samples, respectively.

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Fig. 3. (Color online) PLE spectrum of ${Zn}_{1.99} {GeO}_{4} : 0.01 {Sm}^{3 +}$ (black) and PL spectrum of ${Zn}_{1.96} {GeO}_{4} : 0.04 {Ce}^{3 +}$ (red).

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Fig. 4. PL spectra of ${Zn}_{1.99 - x} {GeO}_{4} : {x Ce}^{3 +}$ , $0.01 {Sm}^{3 +}$ ( $x = 0.00$ , 0.01, 0.02, 0.03, 0.04, and 0.05) samples.

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Fig. 5. Decay curves of ${Zn}_{1.96 - y} {GeO}_{4} : 0.04 {Ce}^{3 +}$ , ${y Sm}^{3 +}$ ( $y = 0.00$ , 0.005, 0.03, and 0.07) monitored the 446 nm emission under 365 nm excitation.

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Fig. 6. CIE chromaticity diagram of ${Zn}_{1.96} {GeO}_{4} : 0.04 {Ce}^{3 +}$ and ${Zn}_{1.93} {GeO}_{4} : 0.04 {Ce}^{3 +}$ , $0.03 {Sm}^{3 +}$ phosphors.

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Fig. 7. Dependence of $I_{s 0} / I_{s}$ of ${Ce}^{3 +}$ on $C^{6 / 3}$ , $C^{8 / 3}$ , and $C^{10 / 3}$ .

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Table 1. Decay Kinetics for Zn1.96−yGeO4:0.04Ce3+, ySm3+ (y=0.00, 0.005, 0.03, and 0.07) Phosphors
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Table 1. Decay Kinetics for Zn1.96−yGeO4:0.04Ce3+, ySm3+ (y=0.00, 0.005, 0.03, and 0.07) Phosphors
$τ_{1}$ (ns) $A_{1}$ $τ_{2}$ (ns) $A_{2}$
1.4559 1142.543 13.2079 11.988
1.2594 1178.256 13.1723 9.651
1.2763 1147.682 11.5937 8.7932
1.422 1243.268 11.2764 9.143

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Yushuang Qi, Lei Zhao, Wenjuan Bian, Xue Yu, Xuhui Xu, Jianbei Qiu. Energy transfer between Ce³⁺ and Sm³⁺ in Zn₂GeO₄ phosphor with the native defects for light-emitting diodes[J]. Chinese Optics Letters, 2017, 15(8): 081601

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