Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 761, Issue -, Pages 74-83Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2014.03.002
Keywords
OLED; Electroluminescence; Green emitter; Iridium complex
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Funding
- Department of Science and Technology, Ministry of Science and Technology, India [SR/S1/IC-73/2010]
- Defence Research and Development Organisation, India [NRB-213/MAT/10-11]
- University Grants Commission, India [36-21/2008 (SR)]
- Council of Scientific and Industrial Research, India [3732/NS-EMRII]
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Synthesis, photophysical and electroluminescent analysis of cyclometalated iridium (III) complexes Ir(bpb)(2)(pic) are reported. The strongly allowed phosphorescence is the result of significant spin-orbit coupling of the Ir center. The lowest energy excited sate is a mixture of metal to ligand charge transfer (MLCT) and pi-pi* states. Weak bands at longer wavelength were assigned to (MLCT)-M-1 <- S-0 and (MLCT)-M-3 <- S-0 transitions. These complexes were doped into emissive region of multilayer organic light emitting diode (OLED) by vapor-deposition emit green electroluminescence with similar current-voltage characteristics. These Ir(bpb)(2)(pic) doped OLEDs show appreciable efficiencies as compared with other iridium complex based OLEDs in the literature, which result from efficient trapping and radiative relaxation of singlet and triplet excitons formed in electroluminescent process. Devices with Ir(bpb)(2)(pic) shows the better performance in terms of brightness and power efficiency with brightness of 130301 cd/m(2) at 14.5 V and 26.2 lm/W at 5.5 V, respectively. (C) 2014 Elsevier B.V. All rights reserved.
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