TY - JOUR
T1 - Homoleptic thiazole-based IrIII phosphorescent complexes for achieving both high EL efficiencies and an optimized trade-off among the key parameters of solution-processed WOLEDs
AU - Guo, Haoran
AU - Zhao, Jiang
AU - Tian, Zhuanzhuan
AU - Wu, Yong
AU - Liu, Boao
AU - Dang, Feifan
AU - Yang, Xiaolong
AU - Zhou, Guijiang
AU - Wu, Zhaoxin
AU - Wong, Wai Yeung
N1 - Funding Information:
This research was financially supported by the Fundamental Research Funds for the Central Universities (cxtd2015003), The Program for New Century Excellent Talents in University, the Ministry of Education of China (NECT-09-0651), the Key Creative Scientific Research Team in Shaanxi Province (2013KCT-05), the China Postdoctoral Science Foundation (Grant no. 20130201110034, 2014M562403), and the National Natural Science Foundation of China (no. 20902072, 21572176). The financial support from State Key Laboratory for Mechanical Behavior of Materials is also acknowledged. W.-Y. W. acknowledges the financial support from the National Basic Research Program of China (973 Program, grant no. 2013CB834702), the Areas of Excellence Scheme, University Grants Committee of HKSAR, China (AoE/P-03/08), Hong Kong Research Grants Council (HKBU 12304715), Hong Kong Baptist University (FRG1/14-15/084) and the Hong Kong Polytechnic University.
PY - 2017/1/7
Y1 - 2017/1/7
N2 - Two homoleptic thiazole-based IrIII phosphorescent emitters, Ir-3Tz1F and Ir-3Tz2F, with fluorinated 2-phenylthiazole-type ligands were designed and prepared. Their thermal stability, and photophysical and electrochemical properties, as well as electroluminescent (EL) performances in both monochromic OLEDs and solution-processed WOLEDs were investigated. When doped in monochromic OLEDs made by vacuum deposition, Ir-3Tz1F gave the maximum EL efficiencies with ηL of 56.2 cd A-1, ηext of 15.8% and ηp of 50.2 lm W-1. Critically, solution-processed WOLEDs based on Ir-3Tz1F with three primary colors could achieve an excellent trade-off among the stable balanced white EL spectra, a high EL efficiency and a high color rendering index (CRI). The optimized solution-processed WOLED exhibited very attractive EL efficiencies of 33.4 cd A-1, 16.5% and 30.6 lm W-1, while maintaining both a high CRI of ca. 80 and very stable Commission Internationale de L'Eclairage (CIE) coordinates in a wide driving voltage range from 4 V to 11 V.
AB - Two homoleptic thiazole-based IrIII phosphorescent emitters, Ir-3Tz1F and Ir-3Tz2F, with fluorinated 2-phenylthiazole-type ligands were designed and prepared. Their thermal stability, and photophysical and electrochemical properties, as well as electroluminescent (EL) performances in both monochromic OLEDs and solution-processed WOLEDs were investigated. When doped in monochromic OLEDs made by vacuum deposition, Ir-3Tz1F gave the maximum EL efficiencies with ηL of 56.2 cd A-1, ηext of 15.8% and ηp of 50.2 lm W-1. Critically, solution-processed WOLEDs based on Ir-3Tz1F with three primary colors could achieve an excellent trade-off among the stable balanced white EL spectra, a high EL efficiency and a high color rendering index (CRI). The optimized solution-processed WOLED exhibited very attractive EL efficiencies of 33.4 cd A-1, 16.5% and 30.6 lm W-1, while maintaining both a high CRI of ca. 80 and very stable Commission Internationale de L'Eclairage (CIE) coordinates in a wide driving voltage range from 4 V to 11 V.
UR - http://www.scopus.com/inward/record.url?scp=85007356539&partnerID=8YFLogxK
U2 - 10.1039/c6tc04011j
DO - 10.1039/c6tc04011j
M3 - Journal article
AN - SCOPUS:85007356539
SN - 2050-7526
VL - 5
SP - 208
EP - 219
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 1
ER -