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Vacuum‐Deposited versus Spin‐Coated Emissive Layers for Fabricating High‐Performance Blue–Green‐Emitting Diodes
Author(s) -
Ma Dongxin,
Qiu Yong,
Duan Lian
Publication year - 2018
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201700382
Subject(s) - iridium , chemistry , electroluminescence , quantum efficiency , spin coating , phosphorescence , optoelectronics , diode , oled , vacuum evaporation , ionic bonding , thin film , coating , nanotechnology , materials science , fluorescence , layer (electronics) , ion , optics , biochemistry , physics , organic chemistry , catalysis
The electroluminescent characteristics of two sublimable cationic iridium(III) complexes that bear the same coordinated iridium(III) cation but different tetraphenylborate‐type negative counterions have been investigated. Blue–green‐emitting devices were successfully fabricated from these complexes using various preparation processes, namely, spin‐coating and vacuum evaporation deposition. Experiments indicated that devices with vacuum‐deposited emissive layers showed superior photoelectric properties relative to devices with spin‐coated emissive layers, including a maximum current efficiency of 27.91 cd A −1 , an external quantum efficiency of 10.48 %, a power efficiency of 27.73 lm W −1 and the highest luminance of up to 25.34×10 3 cd m −2 , whereas the turn‐on voltages were quite low. The overall device performance surely ranks among the best of phosphorescent organic light‐emitting diodes based on ionic transition‐metal complexes.