由於資訊產業的發展，人們對於顯示器的需求日漸增高，雖然陰極射線管(CDT)具有低成本及好的影像品質，但它卻具有了太大或太重的缺點。因此，新世代的顯示器必須要具有輕薄的特性。以共軛高分子為主的有機電激發光顯示器(polymer light-emitting diodes (PLED))則以其深厚的潛力吸引了大家的目光。近幾年有機白光高分子元件開始受到矚目，它有著比Liquid crytal display更廣的視角，更高的對比以及簡單且較為廉價的製程。而我所研究的主題是以磷光材料為主要發光材料，磷光材料可以將內部量子效率達到百分之百，換句話說就是希望利用磷光材料降發光效率以及亮度提高，並且加入小分子材料以提高在結合效率。共軛高分子材料對於製程的環境非常的敏感，所以有非常多的研究是針對如何改善元件的效率跟亮度。

　　首先，以ITO/PEDOT:PSS/FIrpic&Ir(btp)2(acac)&PBDorTPD/Ca/Al為基本結構。PEDOT:PSS是當做電洞傳輸層，而FIrpic&Btp2Ir(acac)是主要的磷光材料，白光則是利用這兩種互相調配其比例而來，由於在有機材料中是屬於P type的材料，所以必須增加電子的傳輸以增加在結合效率，其中TPD以及PBD是加強電子傳輸的材料。
　　
　　製作WPLED(White polymer light emitting diode)最困難的地方就是在於將發光材料調配出適當的重量百分比濃度，由於Ir(btp)2(acac)稍微摻雜就會發出高比例的紅光，因此控制摻雜濃度顯得格外重要， Ir(btp)2(acac)在系統中的能量轉移相當好，因此隨著濃度的上升以及下降發光強度增減幅度相當明顯，在努力調配之後我得到了一個CIE (0.34,0.37)的座標。其中為了增加所謂exciton的數目，也就必須增加電子電洞的再結合效率以及機率，TPD&PBD是屬於小分子材料，一般用來增加電子注入的數目以及能力，在加入TPD於小電流時的確可以發現Efficiency有比較高的表現，但是隨著電流電壓的加大，反倒因為濃度效應而讓效率以及亮度隨之降低，最後只加入PBD並調配出最佳濃度，得到了最大亮度3100 Cd/m2。

　　By the development of the intelligent industry, people have more require for the monitor. Although the CRT is low-cost and good image quality, the CRT is too big and too heavy. Therefore, the new flat panel displays (FPD) have to be thinner and lighter. In this age, polymer light-emitting diodes (PLED) that are based on conjugated polymers have attracted much attention because of their potential applicability to large-area flat panel displays (FPD). Because polymeric materials are known to be sensitive, therefore, various approaches have been explored to improve the device efficiency and luminescence. In this work, an effect of thermal treatment before cathode deposition and post cathode deposition are presented for the purpose of achieving high efficiency Polymer light - emitting diodes by change the roughness and the chain intensity.

　　At first, the devices had been made as ITO/PEDOT:PSS
/FIrpic&Ir(btp)2(acac)&PBDorTPD/Ca/Al. The PEDOT: PSS served as HTL, and FIrpic and Ir(btp)2(acac) served as phosphorescent materials. The white emission was tuned the ratio between FIrpic and Ir(btp)2(acac). The PVK was belonging to p-type material. If I wanted to increase the exciton, to increase the injections of the electrons and holes was must. The dopants were TPD and PBD.

　　The most difficulty of all was the modulation of the accurate weight-ratio. The energy-transfer of Ir(btp)2(acac) from host was very good. The intensity of the red peak was serious when the quantity of dopant was a little. Finally the CIE coordinate closest to white emission was (0.34, 0.37). In order to increase the ability of recombination, to dope PBD and TPD was necessary. After that, I found the TPD was useless in my system. The PBD could increase the performance of my device indeed. And the maximum luminance and efficiency were 3100 Cd/m2 and 1.8 Cd/A.

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Chapter Four
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