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Proceedings Paper

Solution processable small molecular host materials for blue and white phosphorescence OLEDs
Author(s): Yi-Ting Lee; Yung-Ting Chang; Chin-Ti Chen; Chao-Tsen Chen
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Paper Abstract

Three new solution processable small molecular host materials based on bis-[3,5-di(9H-carbazol-9-yl)phenyl] structural moiety have been developed for blue phosphorescence (FIrpic dopant) organic light-emitting diodes. Whereas N,N-bis-[3,5-di(9H-carbazol-9-yl)phenyl]methylamine (CzPAMe) has the highest solid state triplet energy gap (ET) of 2.73 eV, tetrakis-[3,3',5,5'-(9H-carbazol-9-yl)]triphenylphosphine oxide (CzPPO) and N,N-bis-[3,5-di(9H-carbazol-9-yl)phenyl]pyrimidin-2-amine (CzPAPm) are two host materials potentially being bipolar for charge transport due to the electron deficient unit of phenylphosphine oxide and pyrimidine, respectively. Due to the insufficient ET (2.56 eV) of CzPAPm, CzPPO or CzPAMe devices are significantly better than CzPAPm devices with or without 1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]phenylene (OXD-7) co-host. Particularly, having no OXD-7 co-host and no vacuum-thermal-deposited extra electron transporting layer, single-layer devices of CzPPO surpassing CzPAMe devices reach current efficiency as high as 9.32 cd/A (or power efficiency of 4.97 lm/W), which is one of the highest of the kind. Corresponding single-layer white phosphorescence OLEDs are also fabricated with the small molecular host material demonstrated herein.

Paper Details

Date Published: 27 September 2013
PDF: 8 pages
Proc. SPIE 8829, Organic Light Emitting Materials and Devices XVII, 88290V (27 September 2013); doi: 10.1117/12.2021451
Show Author Affiliations
Yi-Ting Lee, National Taiwan Univ. (Taiwan)
Academia Sinica (Taiwan)
Yung-Ting Chang, Academia Sinica (Taiwan)
Chin-Ti Chen, Academia Sinica (Taiwan)
Chao-Tsen Chen, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8829:
Organic Light Emitting Materials and Devices XVII
Franky So; Chihaya Adachi, Editor(s)

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