Field-Induced Luminescence Quenching in Electroluminescent Conjugated Polymers  

作　　者：FU Rou-li CHU Jun-hao JIANG Hao SUN Xin 傅柔励;诸君浩;姜浩;孙鑫(National Laboratory for Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083;Department of Physics,Fudan University,Shanghai 200433)

机构地区：[1]National Laboratory for Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083 [2]Department of Physics,Fudan University,Shanghai 200433

出　　处：《Chinese Physics Letters》1999年第10期764-766,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No.19874068;the National High Performance Computing Fund.

摘　　要：The basic physical processes offield-induced luminescence quenching in electroluminescent conjugated polymers is studied by a theoretical model of electron-lattice tight binding with an applied electric field,plus the extended Hubbard interactions,in an unrestricted Hartree-Fock approximation.It is found that there exists a critical field Ec,beyond which the self-trapping singlet-and triplet-excitons(the emitting species)in conjugated polymers will be split directly into hole-polarons and electron-polarons,leading to luminescence quenching.Why the luminescence intensity decreases with increase ofthe applied field and why the luminescence intensity will not be quenched completely in stronger fields are elucidated.The critical field increases with the electron interactions and the binding energy of self-trapping excitons.Possible approaches to decrease field-induced luminescence quenching are increasing the binding energy ofthe exciton and reducing the conjugation length.

关 键 词：LUMINESCENCE QUENCHING TRAPPING 

分 类 号：TG1[金属学及工艺—金属学]