Highly Efficient Organic Blue Electrophosphorescent Devices Based on 3,6‐Bis(triphenylsilyl)carbazole as the Host Material
M.‐H. Tsai(National Taiwan University), Hao‐Wu Lin(National Taiwan University), Hai‐Ching Su(National Taiwan University), T.‐H. Ke(National Taiwan University), Chih‐I Wu(National Taiwan University), Chih‐I Wu(National Taiwan University), Fu Fang(National Taiwan University), Yu-Chan Liao(National Taiwan University), Ken‐Tsung Wong(National Taiwan University), Chih‐I Wu(National Taiwan University), Chih‐I Wu(National Taiwan University)
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Abstract
Blue electrophosphorescence in organic light-emitting diodes (OLEDs) is enhanced by the use of 3,6-bis(triphenylsilyl)carbazole (see figure). This carbazole derivative with sterically bulky and large-gap triphenylsilyl groups is an electrochemically and morphologically stable efficient host material for blue electrophosphorescence. When utilized in OLEDs, high efficiencies of up to 16 %, 30.6 cd A–1, and 26.7 lm W–1 are achieved.
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