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Versatile, Benzimidazole/Amine‐Based Ambipolar Compounds for Electroluminescent Applications: Single‐Layer, Blue, Fluorescent OLEDs, Hosts for Single‐Layer, Phosphorescent OLEDs
Author(s) -
Chen ChihHsin,
Huang WeiSheng,
Lai MeiYi,
Tsao WenCheng,
Lin Jiann T.,
Wu YingHsien,
Ke TungHuei,
Chen LiYin,
Wu ChungChih
Publication year - 2009
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200900561
Subject(s) - ambipolar diffusion , materials science , oled , phosphorescence , optoelectronics , dopant , electroluminescence , iridium , photochemistry , quantum efficiency , fluorescence , doping , layer (electronics) , nanotechnology , chemistry , electron , optics , organic chemistry , physics , quantum mechanics , catalysis
A series of compounds containing arylamine and 1,2‐diphenyl‐1 H ‐benz[ d ]imidazole moieties are developed as ambipolar, blue‐emitting materials with tunable blue‐emitting wavelengths, tunable ambipolar carrier‐transport properties and tunable triplet energy gaps. These compounds possess several novel properties: (1) they emit in the blue region with high quantum yields; (2) they have high morphological stability and thermal stability; (3) they are capable of ambipolar carrier transport; (4) they possess tunable triplet energy gaps, suitable as hosts for yellow‐orange to green phosphors. The electron and hole mobilities of these compounds lie in the range of 0.68–144 × 10 −6 and 0.34–147 × 10 −6 cm 2 V −1 s −1 , respectively. High‐performance, single‐layer, blue‐emitting, fluorescent organic light‐emitting diodes (OLEDs) are achieved with these ambipolar materials. High‐performance, single‐layer, phosphorescent OLEDs with yellow‐orange to green emission are also been demonstrated using these ambipolar materials, which have different triplet energy gaps as the host for yellow‐orange‐emitting to green‐emitting iridium complexes. When these ambipolar, blue‐emitting materials are lightly doped with a yellow‐orange‐emitting iridium complex, white organic light‐emitting diodes (WOLEDs) can be achieved, as well by the use of the incomplete energy transfer between the host and the dopant.