調變三色磷光材料比例製作白光有機發光二極體

Abstract

本論文利用刮刀塗佈搭配旋轉塗佈技術並以Poly(9-vinylcarbazole) (PVK)作為主體參雜兩種或三種銥金屬錯合物客體於其中，製作多層結構的高效率有機磷光二極體元件(PPLED)。黃光LED元件使用Tris[2-(p-tolyl)pyridine]iridium (III) (Ir(mppy)3)與Tris[2-(4-n-hexylphenyl)quinoline)]iridium(III) (Hex-Ir(phq)3)兩種高效率磷光材料以13:1的比例混和，元件最高效率為23cd/A，最大亮度為30000 cd/m2。 本論文亦使用Hex-Ir(phq)3、Ir(mppy)3與Bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III) (FIrpic) 作為RGB三色發光材料製作單發光層白光LED元件，RGB的混和比例為1:0.5:45，其最高效率8.1cd/A，最大亮度6000cd/m2。元件的CIE座標隨電壓的增加僅從(0.35 , 0.42)些微偏移至(0.36,0.43)，為一光色穩定的近白光元件。另以深紅光材料Hex-Ir(piq)3置換Hex-Ir(phq)3與Ir(mppy)3、FIrpic以15:1:480混和，製作出CIE座標為(0.35,0.35)的白光元件，其元件光色比起使用Hex-Ir(phq)3更接近純白光。

This dissertation aims to utilize blade-coating method to fabricate efficient phosphorescent multilayer polymer light-emitting diode (PLED). Iridium complexes are mixed with poly-(vinylcarbazole) (PVK) to form the emissive layer. For yellow phosphorescent PLED, tris[2-(p-tolyl)pyridine]iridium(III) (Ir(mppy)3) and tris[2-(4-n-hexylphenyl)quinoline)]iridium(III) (Hex-Ir(phq)3) are used as green and red dopants respectively. The blending ratio of Ir(mppy)3 and Hex-Ir(phq)3 is 13:1. The efficiency of 23 cd/A and the luminance of 30000cd/m2 are obtained. As for white phosphorescent PLED with single emissive layer, Hex-Ir(phq)3, Ir(mppy)3 and bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III) (FIrpic) are used as dopants in the ratio of 1:0.5:45. The efficiency of 8.1 cd/A and the luminance 6000cd/m2 are achieved. The Commission Internationale de l’Eclairage (CIE) coordinates are stable from 8V to 15 V and only slight changes can be observed from (0.35, 0.42) to (0.36, 0.43). By substituting Hex-Ir(phq)3 with deep red Hex-Ir(piq)3, CIE coordinate (0.35, 0.35) is obtained as the blending ratio Hex-Ir(piq)3 : Ir(mppy)3 : FIrpic = 15:1:480. The light from device uses Hex-Ir(piq)3 is more close to pure white.