Investigation of multicolor emitting Cs3GdGe3O9:Bi3+,Eu3+ phosphors via energy transfer for WLEDs

Fengfeng Chi; Zhangchao Ji; Qian Liu; Bin Jiang; Bing Wang; Jie Cheng; Bin Li; Shengli Liu; Xiantao Wei

doi:10.1039/d2dt03349f

Investigation of multicolor emitting Cs₃GdGe₃O₉:Bi³⁺,Eu³⁺ phosphors via energy transfer for WLEDs

Dalton Trans. 2023 Jan 17;52(3):635-643. doi: 10.1039/d2dt03349f.

Authors

Fengfeng Chi^{1

2}, Zhangchao Ji¹, Qian Liu³, Bin Jiang⁴, Bing Wang⁵, Jie Cheng¹, Bin Li¹, Shengli Liu¹, Xiantao Wei²

Affiliations

¹ New Energy Technology Engineering Laboratory of Jiangsu Province & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China. liusl@njupt.edu.cn.
² School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China. ffchi@mail.ustc.edu.cn.
³ College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
⁴ College of Electronic and Information Engineering, West Anhui University, Lu'an 237012, China.
⁵ Institute for Computational Materials Science, Joint Center for Theoretical Physics, School of Physics and Electronics, Henan University, Kaifeng 475004, China.

PMID: 36530173
DOI: 10.1039/d2dt03349f

Abstract

Bi³⁺/Eu³⁺ doped Cs₃GdGe₃O₉ luminescent materials were prepared by a solid-state reaction. The energy band and density of states of Cs₃GdGe₃O₉ were calculated by density functional theory. The Cs₃GdGe₃O₉ host presents a broadband emission peaking at 520 nm. Systemic measurement and analysis of luminescence properties were performed to confirm the energy transfer in Cs₃GdGe₃O₉:Bi³⁺,Eu³⁺. The multicolor modulated emission from blue (0.1678, 0.1568) to red (0.5931, 0.3251) can be achieved by varying the doping ratio of bismuth to europium. A white light-emitting diode (WLED) was produced by combining the Cs₃GdGe₃O₉:0.05Bi³⁺,0.1Eu³⁺ phosphor, a commercial green phosphor, and a 310 nm ultraviolet chip. The color rendering index of the WLED driven by 20 mA bias current is 89.6 with the CIE coordinates of (0.3520, 0.3626). The results reveal that the Cs₃GdGe₃O₉:Bi³⁺,Eu³⁺ phosphor is a potential material that can be used in multicolor tunable luminescence and WLEDs.