The unusual electrochemical and photophysical behavior of 2,2'-bis(1,3,4-oxadiazol-2-yl)biphenyls, effective electron transport hosts for phosphorescent organic light emitting diodes.
The fluorescence and phosphorescence of 2,2'-bis(5-phenyl-1,3,4-oxadiazol-2-yl)biphenyl shows good spectral matching with the absorption spectra of the MLCT1 and MLCT3 transitions of Ir(ppy)3. The red-shift of the 0-0 band in the phosphorescence at 77 K is due to the intramolecular pi-pi interactions between the oxadiazole side chains. Maximum brightness of 43,000 cd/m2 with an efficiency of 26 cd/A at 200 cd/m2 was achieved when BOBP was used as the host material for Ir(ppy)3 in the PHOLED study. [structure: see text].
Leung
Man-kit
MK
Department of Chemistry, National Taiwan University, Taipei 106, Taiwan. mkleung@ntu.edu.tw
Yang
Chih-Chiang
CC
Lee
Jiun-Haw
JH
Tsai
Hsin-Hung
HH
Lin
Chi-Feng
CF
Huang
Chih-Yen
CY
Su
Yuhlong Oliver
YO
Chiu
Chi-Feng
CF
D001713:Biphenyl Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004563:Electrochemistry; D004583:Electrons; D008029:Lighting; D049408:Luminescent Agents / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009930:Organic Chemicals / Q000737:chemistry*; D010069:Oxadiazoles / Q000138:chemical synthesis / Q000737:chemistry*; D010777:Photochemistry; D013237:Stereoisomerism
D001713:Biphenyl Compounds; D049408:Luminescent Agents; D009930:Organic Chemicals; D010069:Oxadiazoles