Citation: TENG Ming-Yu, WANG Cheng-Cheng, JING Yi-Ming, ZHENG You-Xuan, LIN Chen. Efficient Green Organic Light-Emitting Diodes with fac-Tris(2-(4-trifluoromethylphenyl)pyridine)iridium Complex as Emitter[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(7): 1490-1496. doi: 10.3969/j.issn.1001-4861.2013.00.236 shu

Efficient Green Organic Light-Emitting Diodes with fac-Tris(2-(4-trifluoromethylphenyl)pyridine)iridium Complex as Emitter

1.
State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China

Received Date: 24 December 2012
Available Online: 1 April 2013
Fund Project: 国家自然科学基金(No.20971067) (No.20971067)江苏省自然科学基金(No.BK2011551)资助项目。 (No.BK2011551)

fac-Tris(2-(4-trifluoromethylphenyl)pyridine)iridium (Ir(tfmppy)₃) was prepared by conventional method and its crystal structure was determined. Excitation at either π→π^* or MLCT absorption band of Ir(tfmppy)₃ in CH₂Cl₂ solution leads to the same MLCT emission maxima at 525 nm with Commission Internationale de L'Eclairage (CIE) coordinates of (0.31, 0.62) and the emission quantum yield is 4.59% in CH₂Cl₂ (by reference to an aerated aqueous solution of [Ru(bpy)₃]Cl₂ as the standard solution). Organic light-emitting diodes (OLEDs) based on the green electrophosphorescent complex in ITO/TAPC (1,1-bis [4-[N,N-di(p-tolyl)amino]phenyl]cyclohexane, 60 nm)/Ir(tfmppy)₃ (x%):mCP (1,3-bis (carbazol-9-yl)benzene, 30 nm)/TPBi (2,2',2"-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole, 60 nm)/LiF (1 nm)/Al (100 nm) were investigated. The device with 4% dopant concentration shows a maximum current efficiency of 33.95 cd·A^-1 at 4 197 cd·m^-2, a maximum brightness of 43 612 cd·m^-2 at 12.7 V, and CIE coordinates of (0.31, 0.61). The device with 6% dopant concentration exhibits a maximum power efficiency of 27.29 cd·A^-1 at 1 981 cd·m^-2, a maximum brightness of 33 071 cd·m^-2 at 9.6 V. The electron mobility of Ir(tfmppy)₃ is 4.24×10^-6 cm²·(V·s)^-1 under electric field of 1 300 (V·cm^-1)^1/2 via transient electroluminescence (TEL) method, which is close to that of Alq₃ (tri(8-hydroxyquinoline)aluminum) emitter. CCDC: 887658.
- iridium complex;2-(4-trifluoromethylphenyl)pyridine;electrophosphorescence;organic light-emitting diodes;electron mobility
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沈阳化工大学材料科学与工程学院沈阳 110142