An Improved Blue Polymer Light-Emitting Diode by Using Sodium Hydroxide/Ca/Al Cathode  

作　　者：马良 谢志元 刘俊 杨君维 程延祥 王利祥 王佛松 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Changchun 130022 [2]Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022

出　　处：《Chinese Physics Letters》2005年第12期3186-3188,共3页中国物理快报（英文版）

摘　　要：The performance of blue polymer light-emitting diodes （PLEDs） based on poly（9,9-dioctylfluorene） （PFO） is improved by introducing a thin layer of sodium hydroxide （NaOH） between the calcium cathode and the PFO emissive layer. By replacing the commonly used Ca/Al cathode by a NaOH （2.5nm）/Ca （10nm）/Al cathode, the driving voltage is reduced from 8.3 V to 5.4 V and the light-emitting efficiency is enhanced from 0.46cd/A to 0.72cd/A for achieving a luminance of 500cd/m^2, respectively. Moreover, the device with NaOH/Ca/Al cathode shows a pure blue emission of （0.17, 0.12） at high brightnesses. These improvements are attributed to introduction of a thin layer of NaOH that can lower the interracial barrier and facilitate electron injection.The performance of blue polymer light-emitting diodes （PLEDs） based on poly（9,9-dioctylfluorene） （PFO） is improved by introducing a thin layer of sodium hydroxide （NaOH） between the calcium cathode and the PFO emissive layer. By replacing the commonly used Ca/Al cathode by a NaOH （2.5nm）/Ca （10nm）/Al cathode, the driving voltage is reduced from 8.3 V to 5.4 V and the light-emitting efficiency is enhanced from 0.46cd/A to 0.72cd/A for achieving a luminance of 500cd/m^2, respectively. Moreover, the device with NaOH/Ca/Al cathode shows a pure blue emission of （0.17, 0.12） at high brightnesses. These improvements are attributed to introduction of a thin layer of NaOH that can lower the interracial barrier and facilitate electron injection.

关 键 词：POLYFLUORENE PERFORMANCE EFFICIENCY 

分 类 号：O484[理学—固体物理]