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Shaoan Zhang,Yuanxing Li,Wenfeng Li,Zhenzhang Li,Minfan Qiu,Zhongfei Mu,Yang Li,Yihua Hu 한국물리학회 2019 Current Applied Physics Vol.19 No.9
High brightness and precise adjustment of luminescence colour of phosphors are two main targets in the research of phosphor-converted white LEDs. However, few feasible strategy can be employed to achieve the multicolortunable luminescence under the premise of maintaining high quantum efficiency. Here, we demonstrate a highefficiency energy-transfer process from Tb3+ to Eu3+ ions with a higher luminescent quantum efficiency (64.5% and 53.4%, respectively), and green-red multicolor emission in Lu2GeO5 host via varying the doping content of Tb3+ and Eu3+ ions. Besides, Lu2GeO5:Tb3+, Lu2GeO5: Eu3+ and Lu2GeO5: Tb3+, Eu3+ all exhibit weak thermal quenching which ensures the stable use of white LED device in the high temperature environment. This paper provides a novel multicolor-tunable phosphor with high brightness, efficient energy transfer and weak thermal quenching, which presents a potential application for UV-converted white LEDs.