含benzoimidazole 配位基的銥金屬高效能磷光材料;Highly Phosphorescent Bis-Cyclometalated Iridium Complexes Containing Benzoimidazole-Based Ligands

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題名:	含benzoimidazole 配位基的銥金屬高效能磷光材料;Highly Phosphorescent Bis-Cyclometalated Iridium Complexes Containing Benzoimidazole-Based Ligands
作者:	黃偉聖;Wei-Sheng Huang
貢獻者:	化學研究所
關鍵詞:	磷光;發光二極體;Phosphorescent;OLED
日期:	2004-06-15
上傳時間:	2009-09-22 10:11:33 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本論文合成新的benzoimidiaziole (bi)化合物，這些化合物可以與三氯化銥以cyclometalation的方式配位，形成具有強磷光性質的銥金屬化合物。我們針對這些化合物進行光物理，電化學性質的探討，並選取部分銥金屬化合物製備成元件進行測試。在光物理方面，配位基bi的吸收光譜範圍從278-385 nm，發射光譜從360-510 nm，放出的螢光可從紫藍到綠。配位基與銥金屬形成錯化物後，可放射出綠到紅色的磷光，波長範圍為507~651 nm。多數的配位基與銥錯化物於室溫時，在無氧溶液中多有不錯的量子產率。電化學方面，含diarylamine的bi在循環伏安法下可以測得amine氧化電位，銥錯化物也可以測得銥（III）氧化成銥（IV）。藉由循環伏安法測量，可得知化合物的HOMO與LUMO之能階。元件結構為ITO BPAPF（Type I）或NPB（Type II） 6 wt % doped (bi)2Ir(acac) in CBP Alq3 Mg:Ag，綠光的Ir-Ph-ac與Ir-C-ac都有相當好的效率，在電流為100 mA/cm2，亮度可分別達46393、35332 cd/m2，Ir-Ph-ac最大亮度甚至接近150000 cd/m2。黃光的Ir-F-ac在電流為100 mA/ cm2，亮度可達21105 cd/m2，最大亮度40794 cd/m2也有不錯的表現。紅光的Ir-naph-ac在電流為100 mA/cm2，亮度可達4562 cd/m2，最大亮度為12984 cd/m2。在元件之中以綠光與黃光擁有較好的效率。 New benzoimidazole compounds have been synthesized. These compounds undergo cyclometalation with iridium trichloride to form iridium (III) complexes which exhibit strong phosphorescence. The photophysical and electrochemical properties of these compounds were investigated. Electroluminescent devices were fabricated from selected iridium complexes. The absorption and emission wavelengths of the bi ligands range from 278 to 385 nm, and from 360 to 510 nm, respectively. The emission colors of the fluorescence cover from purple-blue to green. The iridium complexes emit green to red phosphorescence with wavelengths ranging from 507 to 651 nm. Most of ligands and iridium complexes possess good quantum yields in air-free solution at room temperature. The reversible wave in cyclic voltammograms of the bi ligands containing diarylamine can be attributed to the oxidation of the amines. The Iridium complexes exhibit an reversible oxidation wave due to Ir (III)→Ir (IV). The HOMO and LUMO energy levels for each complex are located from the cyclic voltammogram and the absorption edge. The structure of device we used is : ITO BPAPF (Type I) or NPB (Type II) 6wt % doped (bi)2Ir(acac) in CBP Alq3 Mg:Ag .Green-emitting devices fabricated from Ir-Ph-ac and Ir-C-ac exhibit very good efficiencies. At a current density of 100 mA/cm2, the brightness reaches 46393 and 35332 cd/m2 for Ir-Ph-ac and Ir-C-ac devices, respectively.The maxinum brightness of Ir-Ph-ac can even reach 150000 cd/m2. Yellow-emitting device of Ir-F-ac has a brightness of 21105 cd/m2 at a current density of 100 mA/cm2 , and the maximum brightness is 40794 cd/m2. The red-emitting Ir-naph-ac device has a brightness of 4562 cd/m2 at a current density of 100 mA/cm2 and a maximum brightness of 12984 cd/m2. Green and yellow-emitting devices appear to have better efficiencies among all.
顯示於類別:	[化學研究所] 博碩士論文

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