White Light Emission Performance of Y2O3∶Eu3+,Dy3+ Nanophosphors†

doi:10.7503/cjcu20170225

Abstract

Abstract:

A series of Dy³⁺ single doped, Eu³⁺, Dy³⁺ codoped and Sr²⁺, Eu³⁺, Dy³⁺ codoped Y₂O₃ nanophosphors was prepared by high-temperature solid-state sinter method. The crystal structures and morphologies of the samples were analyzed by means of XRD and SEM, and the preparation progress and parameters were optimized. The excitation and emission spectra of rare earth ions doped Y₂O₃ phosphors were measured systematically. Under 330 nm excitation, the characteristics of white light emission of Y₂O₃∶Eu³⁺,Dy³⁺phosphors were investigated, and the ideal CIE value(0.32, 0.33) and color temperature(6100 K) were achieved through adjusting the concentration of europium and dysprosium ions. At the same time, the influence of bivalent strontium ion on the white emission properties was further discussed. The result showed that the emissions of white light from Y₂O₃∶Eu³⁺,Dy³⁺ nanophosphors were improved significantly because of strontium dopant.

Key words: Y2O3∶Eu3+, Dy3+ nanophosphors, Excitation spectrum, Emission spectrum, White light, Energy transfer

CLC Number:

O611.3

TrendMD:

ZHANG Hanbing, LI Chengren, LI Shufeng, GAO Xinyu, HONG Yuanzhi, LI Zhichao, SUN Jingchang. White Light Emission Performance of Y₂O₃∶Eu³⁺,Dy³⁺ Nanophosphors^†[J]. Chem. J. Chinese Universities, 2018, 39(2): 193.

Figures/Tables 10

Fig.1 XRD patterns of the nanophosphors with different sinter termpratures and dopantsa. Y2O3(JCPDS: 43-1036); b. Y2O3∶Eu3+,Dy3+-1300 ℃; c. Y2O3∶Eu3+,Dy3+-1300 ℃+H3BO3; d. Y2O3∶Eu3+,Dy3+-1400 ℃; e. Y2O3∶Eu3+,Dy3+-1400 ℃+H3BO3; f. Y2O3∶Eu3+,Dy3+, 10%Sr2+-1300 K; g. Y2O3∶Eu3+,Dy3+, 50%Sr2+-1300 K; h. SrY2O4(JCPDS:32-1272).

Fig.2 SEM images of Y2O3∶Eu3+,Dy3+(Sr2+) nanophosphors(A) Y2O3∶Eu3+,Dy3+-1300 ℃; (B) Y2O3∶Eu3+,Dy3+-1300 ℃+H3BO3; (C) Y2O3∶Eu3+,Dy3+-1400 ℃;(D) Y2O3∶Eu3+,Dy3+,10%Sr2+-1400 ℃.

Fig.3 Excitation and emission spectra of Y2O3∶1.0%Dy3+ nanophosphors

Fig.4 Luminous intensity expression of Y2O3∶Dy3+ nanophosphors

Fig.5 Excitation and emission spectra of Y2O3∶Eu3+ ,Dy3+ nanophosphors

Fig.6 Excitation and emission intensities with different Eu3+ concentrations

Fig.7 CIE values of Y2O3∶Eu3+,1.0%Dy3+ with varied Eu3+ concentrationsMolar fraction of Eu3+ and CIE value: a. 0.5%(0.29, 0.31); b. 0.8%(0.30, 0.30); c. 1.0%(0.32, 0.33); d. 1.2%(0.34, 0.33); e. 1.5%(0.32, 0.30); f. 2.0%(0.37, 0.29).

Fig.8 Excitation and emission spectra of Y2O3∶Eu3+,Dy3+(Sr2+) nanophosphors(A) and the emission intensity with different Sr2+ concentrations(B)

Fig.9 CIE values of Y2O3∶Sr2+, 1.0%Eu3+, 1.0%Dy3+ with varied Sr3+ concentrationsMolar fraction Sr2+ and CIE value: a. 5.0%(0.31, 0.31); b. 8.0%(0.32, 0.31); c. 10%(0.33, 0.32); d. 20%(0.38, 0.25); e. 30%(0.44, 0.21); f. 50%(0.35, 0.17).

Fig.10 Energy transfer from Dy3+ to Eu3+ under the codoping of Sr2+ ionNRT: non-radiative transition, ET: energy transfer.

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White Light Emission Performance of Y₂O₃∶Eu³⁺,Dy³⁺ Nanophosphors^†

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