Sensitized ligand narrow-band phosphorescence for high-efficiency solution-processed OLEDs  

作　　者：Qian Wang Jin-Yun Wang Hao Zeng Li-Yi Zhang Zhong-Ning Chen 

机构地区：[1]State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [2]Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China [3]University of Chinese Academy of Sciences,Beijing 100039,China

出　　处：《Science China Chemistry》2022年第8期1559-1568,共10页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(92061202 and 21801242);the Fujian Science and Technology Project(2020L3022);the Strategic Priority Research Program of Chinese Academy of Sciences(XDB20000000)。

摘　　要：Narrow-band emission is crucial for high color purity in panel display.Nevertheless,attaining narrow-band emission is highly challenging because either thermally activated delayed fluorescence or phosphorescence in organic and metal-organic compounds originates primarily from multiple charge transfer transitions featured with broad bandwidths.In this work,a general tactic for achieving highly efficient narrow-band emission is proposed by the sensitization of ligand-centered phosphorescence through substantial intermetallic interaction.Relative to weak phosphorescence in mononuclear Pt(Ⅱ)precursors,highly efficient ligand-centered phosphorescence is dramatically activated in Pt(Ⅱ)-Au(Ⅰ)heteronuclear complexes with quantum yield as high as 81%in solutions and 97%in doping films.High-efficiency solution-processed organic light-emitting diodes(OLEDs)with narrow-band emission are successfully attained with external quantum efficiency(EQE)of 21.6%and a full width at half maxima(FWHM)of 36 nm for yellow electroluminescence and EQE of 20.8%and FWHM of 32 nm for green electroluminescence.

关 键 词：ELECTROLUMINESCENCE narrow-band emission organic light-emitting diode PHOSPHORESCENCE solution process 

分 类 号：O641.4[理学—物理化学] TN383.1[理学—化学]