Li Quanfeng, Zhang Shaoan, Lin Wenxian, Li Wenfeng, Li Yuanxing, Mu Zhongfei, Wu Fugen
Experimental Teaching Department, Guangdong University of Technology, Waihuan Xi Road, No.100, Guangzhou 510006, People's Republic of China.
School of Optoelectronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, People's Republic of China.
Spectrochim Acta A Mol Biomol Spectrosc. 2020 Mar 5;228:117755. doi: 10.1016/j.saa.2019.117755. Epub 2019 Nov 5.
In the last few years, multicolor-tunable phosphors, especially single-composition white-light-emitting phosphors, have attracted increasing attention and interest for UV-converted white LEDs. In this paper, LuGeO:Bi phosphor presents a doublet emission ranging from UV to visible spectrum with a high QE of 76%. To obtain a warm white emission, we tried to codope Eu or Sm into LuGeO with Bi ions. Multicolor-tunable emission colors of Bi-Eu and Bi-Sm codoped LuGeO samples are adjusted from cold white light, warm white light, light pink, pink, to red by changing the Eu or Sm doping concentration. Energy transfer process occurring from Bi to Eu or Sm is discussed in detail and the corresponding η of Bi-Eu and Bi-Sm can reach as high as 42% and 35%, respectively. This paper not only provides a novel UV-converted multicolor-tunable phosphor, but also discovery novel single-composition white-light-emitting phosphors for UV-converted white LEDs.
在过去几年中，多色可调谐磷光体，特别是单组分发白光的磷光体，在用于紫外光转换白光发光二极管（UV-converted white LEDs）方面引起了越来越多的关注和兴趣。在本文中，LuGeO:Bi磷光体呈现出从紫外光谱到可见光谱的双峰发射，量子效率高达76%。为了获得暖白色发射，我们尝试将Eu或Sm与Bi离子共掺杂到LuGeO中。通过改变Eu或Sm的掺杂浓度，Bi-Eu和Bi-Sm共掺杂LuGeO样品的多色可调发射颜色从冷白光、暖白光、浅粉色、粉色调整到红色。详细讨论了从Bi到Eu或Sm发生的能量转移过程，Bi-Eu和Bi-Sm的相应能量转移效率分别可高达42%和35%。本文不仅提供了一种新型的紫外光转换多色可调谐磷光体，还发现了用于紫外光转换白光发光二极管的新型单组分发白光的磷光体。
