Growth and Optical Spectra of Tb³⁺/Eu³⁺ Co-doped Cubic NaYF₄ Single Crystal for White Light Emitting Diode

Yongzhang Jiang¹，Haiping Xia¹，Jiazhong Zhang¹，Shuo Yang¹，Haochuan Jiang²，Baojiu Chen³

1. Key Laboratory of Photoelectronic Materials,Ningbo University2. Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences3. Department of Physics,Dalian Maritime University

摘 要：High quality Tb³⁺/Eu³⁺ co-doped cubic NaYF₄ single crystal in the size of Φ1.0 cm×6.6 cm was grown by a modified Bridgman method using KF as assistant flux for NaF-YF₃ system under the condition of completely closed Pt crucible.A white light emission from the combination of the violet-blue,blue,green,orange,and red lights with chromaticity coordinates of x = 0.3107,y = 0.3274,correlated color temperature of T_c = 6637 K,color rendering index of R_a = 83,and color quality scale of Q_a = 82 could be obtained from 1.51 mol%Tb³⁺ and 1.42 mol%Eu³⁺ co-doped cubic NaYF₄ single crystal when being excited by a 369 nm light.This indicates that Tb³⁺/Eu³⁺ co-doped cubic NaYF₄ single crystal has a potential application in white light emitting diode excited by ultraviolet light.

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