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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41274

Title: Bipolar Hosts Based on a Rigid 9,10-Dihydroanthracene Scaffold for Full-Color Electrophosphorescent Devices.
Authors: Atul Chaskar;Wen-Yi Hung;Shou-Wei Chen;Hsiao-Fan Chen;Pei-Yu Hung;Ken-Tsung Wong
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2014
Issue Date: 2017-02-13T07:22:54Z
Publisher: Israel Journal of Chemistry
Abstract: Abstract: Two bipolar hosts, CzDPO and CzDOxa, comprising a hole-transporting carbazole and an electron-transporting diphenyl phosphine oxide or oxadiazole with a saturated linker (9,10-dihydroanthracene) have been synthesized and characterized. The saturated linker limited the effective extension of π conjugation, leading to high triplet energies (ET=2.97–2.98 eV). The diastereomers with a rigid configuration provided an amorphous thin film with high thermal (Td=415–444 °C) and morphological stability (Tg=188–224 °C). The high triplet energies and bipolar carrier transport characteristics (ambipolariy) of CzDPO and CzDOxa can facilitate exothermic energy transfer to the dopants and balance carrier injection/transport in the emission layers. As a result, they were utilized as universal hosts for various phosphorescent OLEDs (from blue to red), showing average external quantum efficiencies (ηext=8.2–13.1 %) and low efficiency roll-off. In addition, we also fabricated dual-emitter white organic light-emitting diodes with a co-doped single emissive layer. WOLED hosted by CzDOxa exhibited satisfactory device efficiencies (14.4 %, 25.7 cd A−1, 27 lm W−1) with highly stable chromaticity (CIEx=0.26–0.28 and CIEy=0.38) at brightnesses from 560 to 15200 cd m−2.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41274
Appears in Collections:[光電科學研究所] 期刊論文

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