可撓式有機白光發光二極體之研製

本研究在可撓式塑膠基板上研製有機白光發光二極體，研究中先利用紅光摻雜染料DCJT摻雜在Alq3中來製作可撓式有機紅光發光二極體，其元件結構為ITO/TPD/Alq3:DCJT/Alq3/LiF/Al，並研究DCJT之摻雜濃度對元件發光特性之影響，結果發現摻雜濃度越高，其發出之波長將會隨摻雜濃度之增加而增長，但其發光亮度反隨之降低。本研究亦研製可撓式有機藍光發光二極體，其結構為ITO/TPD/ADS082/Alq3/LiF/Al。以此藍光有機發光二極體作為基本結構，再利用先前紅光染料DCJT之摻雜技術，在電子傳輸層Alq3或藍光主發光層中摻雜DCJT，使元件發出紅、藍及綠光，來獲得可撓式有機白光發光二極體，研究結果發現當DCJT摻雜為2%，且將DCJT摻雜在藍光主發光層中，所獲得之白光元件發光特性極為穩定，CIE色度值為（0.33,0.33），極接近標準白光，且其CIE色度值不會隨偏壓大小改變而漂移。

This report studied to fabricate white organic light emitting diodes on flexible substrates. The first study is doping Red dopants DCJT in the host emitter layer Alq3 to fabricate flexible red organic light emitting diodes, and the doping characteristics of flexible organic light emitting diode was studied, the device structure was ITO/TPD/DCJT: Alq3/LiF/Al. The result of the study discover that the most heavily doped concentration can achieve the red shift of the device, but the brightness of the device become weaker. In this report, another study fabricated blue organic light emitting diodes, the device structure was ITO/TPD/ADS082/Alq3/LiF/Al. Use this blue organic light emitting diodes as base structure, and the red dopants doped in different organic layers, electron-transporting layer, blue host-emitting layer, respectively, The competititive emission between blue and red emitters was studied with various doped zones. When the DCJT doped zone was located far away from the hole-injection layer, both the blue and red color can be emitted. An appropriate doping location and partially greenish from AlQ3 are expected to afford a white light. Finally, a white emission with the CIE value, (0.30, 0.32), independent of the applied voltage, was obtained with the optimum doped width and location.