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Effect of substituent groups of porphyrins on the electroluminescent properties of porphyrin‐doped OLED devices
Author(s) -
Zhu LinJian,
Wang Jian,
Reng TieGang,
Li ChunYan,
Guo DongCai,
Guo CanCheng
Publication year - 2010
Publication title -
journal of physical organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.325
H-Index - 66
eISSN - 1099-1395
pISSN - 0894-3230
DOI - 10.1002/poc.1592
Subject(s) - oled , electroluminescence , dopant , photochemistry , chemistry , doping , porphyrin , biphenyl , substituent , phosphorescence , optoelectronics , light emitting diode , materials science , fluorescence , organic chemistry , optics , physics , layer (electronics)
Six tetraphenylporphyrins (TRPPH 2 ) with different horizontal substituents R (R = H, CH 3 , OH, F, Cl, Br) were synthesized, and the organic light‐emitting diode (OLED) devices with a general configuration of ITO/TPD/Alq 3 :2%TRPPH 2 /Alq 3 /Al were prepared. The substituted TRPPH 2 was used as the host dopant, 4,4‐bis‐( m ‐tolyphenylamino)biphenyl (TPD) was used as a hole‐transporting material, and aluminum tris(8‐quinolinolato) (Alq 3 ) was used as an electron‐transporting material. The electroluminescent (EL) properties of these devices were studied to understand the light emitting properties of the substituted TRPPH 2 . Previous studies have found that the color emitted by the devices was dependent on the TRPPH 2 dye concentration. The electronic effect of the horizontal substituents R of TRPPH 2 influenced the turn‐on voltage, brightness, and power efficiency of the devices. Also, the electroluminescence performance of the porphyrin‐doped OLED devices depended on the effectual overlaps between the emission of electron‐transporting material and the absorption of the dopants. This means that it is possible to evaluate the electroluminescence performance of the porphyrin‐doped OLED devices based on the emission of electron‐transporting material and the absorption of the dopants. Copyright © 2009 John Wiley & Sons, Ltd.