Intramolecular energy transfer between the triplet of ancillary ligand and the metal to ligand charge transfer state existed in heterocyclometalated iridium (III) complexes

被引：13

作者：

Han, Liangliang ^{[1
,2
]}

Yang, Dongfang ^{[1
,2
]}

Li, Wenlian ^{[1
]}

Chu, Bei ^{[1
]}

Chen, Yiren ^{[1
]}

Su, Zisheng ^{[1
,2
]}

Zhang, Dongyu ^{[1
,2
]}

Yan, Fei ^{[1
,2
]}

Wu, Shuanghong ^{[1
,2
]}

Wang, Junbo ^{[1
,2
]}

Hu, Zhizhi ^{[3
]}

Zhang, Zhiqiang ^{[3
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Key Lab Excited State Proc, Changchun 130033, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

[3] Liaoning Univ Sci & Technol, Organ Photoelect Mat & Technol Dev Ctr, Anshan 114000, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 16期

关键词：

charge transfer states; iridium compounds; organic compounds; organic light emitting diodes; phosphorescence; photoluminescence; ELECTROLUMINESCENCE;

D O I：

10.1063/1.3122938

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Higher efficiency red organic light emitting devices (OLEDs) were obtained by employing Ir (III) complexes with 1-phenylbutane-1, 3-dione (ba) as the second ligand than that with acetylacetone (acac) as the second ligand, which were attributed to the intramolecular energy transfer existed in these complexes. The reason were attributed to the intramolecular energy transfer existed in these complexes and were approved by their photoluminescence characteristics at 77 K, as well the phosphorescence decay lifetime. Because of the lower triplet energy level of ba (T-ba,19 230 cm(-1)) whose energy was suitable to transfer to the triplet of the metal to ligand charge transfer (MLCT) ((MLCT)-M-3,16 260 cm(-1)) state compared to T-acac (25 500 cm(-1)), more efficient OLEDs were obtained (7.0 cd/A) using Ir[2-(4(')-methanoxy-styryl)-benzothiazole](2)ba (ba-2) than Ir[2-(4(')-methanoxy-styryl)-benzothiazole](2)acac acac-2 (6.1 cd/A).

引用

页数：3

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