White Electroluminescence from Bicarbazyl-containing Conjugated Polymers as Single-Emitting Component

Bulletin of the Korean chemical society

Ji-Hoon Lee¹  In-Nam Kang¹  Sung-Ryong Kim¹  Min-Chul Chung¹  Se-Young Oh¹  Sung-Hwan Lim¹  Yang-Bae Kim¹ 

关键词: White emitting;    Bicarbazyl;    Excimer;    Single-emitting;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Two bicarbazyl-containing fluorene copolymers, PFEBCz (95/5) and PFEBCz (75/25), were synthesized for white light electroluminescence from a single emitting polymer. All synthesized polymers were soluble in common organic solvents such as chloroform and toluene. The weight-average molecular weights (Mw) of the PFEBCz (95/5) and PFEBCz (75/25) copolymers were found to be 11,000 and 5,700 with polydispersity indices 1.4 and 1.8. The EL spectrum of the PFEBCz (75/25) device showed bright white-light emission with CIE coordinates of (0.32, 0.34) at 1000 cd/m2, which is very close to that for pure white (0.33, 0.33). This white emission may have been due to strong excimer formation between the bicarbazyl and fluorene polymer backbone. The device exhibited a maximum brightness of 3400 cd/m2 with a maximum efficiency of 0.2 cd/A.

【 授权许可】

Unknown