Modulating Heavy Atom Effect in Germylene for Persistent Room Temperature Phosphorescence

Author:

Dai Wen1ORCID,Yang Xiaoang1,Lv Kaiqi2,Li Lei1,Peng Yanbo1,Ma Huili2ORCID,An Zhongfu2ORCID

Affiliation:

1. State Key Laboratory of Physical Chemistry of Solid Surface College of Chemistry and Chemical Engineering Xiamen University Xiamen, Fujian 361005 China

2. Key Laboratory of Flexible Electronics and Institute of Advanced Materials Nanjing Tech University Nanjing 211800 China

Abstract

AbstractAbstract: It is worth but still challenging to develop the low‐valent main group compounds with persistent room temperature phosphorescence (pRTP). Herein, we presented germylene‐based persistent phosphors by introduction of low‐valent Ge center into chromophore. A novel phosphors CzGe and its series of derivatives, namely CzGeS, CzGeSe, CzGeAu, and CzGeCu, were synthesized. Experiments and theoretical calculations reveal that the pRTP behavior were “turn on” due to the heavy atom effect of germylene. More importantly, the low‐valent of oxidation state and structural traits propelled GeCz had a balance between the intersystem crossing and the shortening of lifetime caused by the heavy atoms, resulting the ultralong lifetime of 309 ms and phosphorescent quantum efficiency of 15.84 %, which is remarkable among heavy main group phosphors. This research provides valuable insights to the design of heavy atoms in phosphors and expand the applications of germylene chemistry.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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