New yellow-emitting phosphorescent cyclometalated iridium(III) complex

被引:2
作者
Ivanov, P. [1 ,2 ]
Tomova, R. [1 ]
Petrova, P. [1 ]
Stanimirov, S. [2 ]
Petkov, I. [2 ]
机构
[1] Bulgarian Acad Sci, Inst Opt Mat & Technolol Acad J Malinowski, Acad G Bonchev Str Bl 109, BU-1113 Sofia, Bulgaria
[2] Univ Sofia, Fac Chem & Pharm, Lab Organ Photochem, Sofia 1164, Bulgaria
来源
17TH INTERNATIONAL SCHOOL ON CONDENSED MATTER PHYSICS (ISCMP): OPEN PROBLEMS IN CONDENSED MATTER PHYSICS, BIOMEDICAL PHYSICS AND THEIR APPLICATIONS | 2012年 / 398卷
关键词
DIODES;
D O I
10.1088/1742-6596/398/1/012052
中图分类号
O59 [应用物理学];
学科分类号
摘要
We have synthesized a new yellow iridium complex Iridium(III) bis[2-phenylbenzothiazolato-N,C-2']-(1-phenylicosane-1,3-dionate) (bt)(2)Ir(bsm), based on the benzothiazole derivative. The synthesized molecule was identified by H-1 NMR and elemental analysis. The UV-Visible absorption and photoluminescence (PL) spectra of (bt)Ir-2(bsm) in CH2Cl2 solution were found at 273 nm and 559 nm, respectively. The complex was used as a dopant into a hole-transporting layer (HTL) in a multilayered organic light emitting device (OLED) structure: ITO/doped-HTL/EL/ETL/M. ITO was a transparent anode of In2O3:SnO2, M- a metallic Al cathode, HTL- 4,4'-bis(9H-carbazol-9-yl)biphenyl (CBP) incorporated in poly(N-vinylcarbazole) (PVK) matrix, EL- electroluminescent layer of bis(8-hydroxy-2-methylquinoline)-(4-phenylphenoxy)aluminum (BAlq) and ETL-electron-transporting layer of tris(8-hydroxyquinolinato)aluminum (Alq(3)). The electroluminescent (EL) spectra of OLEDs were basically the sum of the emissions of BAlq at 496 nm and the emission of (bt)(2)Ir(bsm) at 559 nm. With increasing (bt)(2)Ir(bsm) concentration, the relative electroluminescent intensity of greenish-blue emission (at 496 nm) decreased, while the yellow (at 559 nm) - increased and CIE coordinates of the device shifted from (0.21, 0.33) at 0 wt % to (0.40, 0.48) at 8 wt % of the dopant. It was found that OLED with 0.5 wt % (bt)(2)Ir(bsm) had the best performance and stable color chromaticity at various voltages.
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页数:6
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