紫外光可聚合聚芴高分子之合成及其在多層高分子電激發光元件上之應用

Abstract

摘要

本研究的主要目的為合成含有環氧丙烷之紫外光可聚合聚芴高分子，並且利用旋轉塗佈的方式製作出多層式白光元件，實驗中首先利用Suzuki coupling成功合成出放光涵蓋紅綠藍三原色波長且在芴的九號碳位置上含有環氧丙烷之聚芴高分子(P1、P3~P7)，其中聚合物P1為最大放射波長在452nm的藍光材料，聚合物P3與P4的最大放射波長在543nm附近為綠光材料，聚合物P5~P7則為最大放射波長在636nm左右的紅光材料。 研究中的第二部份我們合成出一個相似於聚合物P1的聚芴高分子(P2)，而P1與P2分子結構的差別僅於P2不含有環氧丙烷此官能基團，並利用P1和P2兩個相似的聚合物討論薄膜和元件在光聚前與光聚後的差異，發現光聚後的薄膜具有不可溶性，且在製作成元件後能耐得住較高電壓下的操作。最後我們可利用旋轉塗佈的方式製做出可發白光的多層式高分子電激發光二極體元件。當電壓達到28V時即可成功的顯示出白光光色 CIE 1931 (x,y) = (0.369 , 0.326)。

Abstract

The goal of this study is aimed at synthesizing a class of photo- crosslinkable polyfluorene with oxetane side groups. These materials have potential application for the multi-layer polymer light emitting diodes using a spin-coating process. We synthesized a series of oxetane- containing polyfluorene (P1 and P3~P7) which emit respectively R,G,B three main colors of light. Polymer P1 exhibits blue emission at 452nm, both polymers P3 and P4 exhibit green emission peak at 543 nm, while polymers P5∼P7 exhibit red emission around 636 nm. For comparison purpose, we also synthesized a polyfluorene (P2) which has similar chemical structure with polymer P1 except that it contains no oxetane unit. Both polymers are fabricated in a similar condition to form devices with the configuration of ITO/PEDOT/P1 or P2/Ca/Al. The results demonstrated that the crosslinked P1 films are insoluble and the device P1 polymer could be driven to higher current density before breakdown occurred. Therefore, we are able to fabricate white light multi- layer polymer light emitting diodes by a simple spin-coating process. The device emits white light with a CIE coordinate ( x , y ) = ( 0.369 , 0.326 ) at 28V.