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33.4: A New Class of Host Materials for Blue Phosphorescent Organic Electroluminescent Devices
Author(s) -
Macdonald James,
O'Connell Jenny,
Weber Karl,
Hirai Tadahiko,
Groarke Michelle,
Andresen Sven,
Bown Mark,
Ueno Kazunori
Publication year - 2012
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/j.2168-0159.2012.tb05812.x
Subject(s) - phosphorescence , iridium , carbazole , ambipolar diffusion , oled , electroluminescence , materials science , common emitter , host (biology) , optoelectronics , photochemistry , chemistry , nanotechnology , electron , fluorescence , optics , physics , organic chemistry , ecology , layer (electronics) , quantum mechanics , biology , catalysis
We report a new class of host materials for phosphorescent iridium complexes. These materials were designed to have ambipolar character. The host materials share a 2,2′‐diimidazole core and typically triarylamine or carbazole containing motifs which may give the materials electron‐transporting and hole‐transporting utility, respectively. We have since synthesised a new host material (MMH‐001) and have applied this material in OLED devices with two different emitters; FIrpic, and our own proprietary blue Iridium emitter; MMPBD‐001. The MMH‐001/FIpic device has CIE 1931 coordinates measured as (0.15, 0.34) and performance measured as 5.5 V, 27.2 cd/A, 15.6 lm/W, at 1 mA/cm 2 . The MMH‐001/MMPBD‐001 device shows a deeper blue colour (CIE 1931 0.15, 0.24) and performance measured as 5.4 V, 21.0 cd/A, 12.0 lm/W, at 1 mA/cm 2 .