The Quest for High‐Performance Host Materials for Electrophosphorescent Blue Dopants |
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| Authors: | M‐F Wu S‐J Yeh C‐T Chen H Murayama T Tsuboi W‐S Li I Chao S‐W Liu J‐K Wang |
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| Affiliation: | 1. Institute of Chemistry, Academia Sinica, Taipei 11529 (Taiwan);2. Faculty of Engineering, Kyoto Sangyo University, Kamigamo, Kyoto 603‐8555 (Japan);3. Center for Condensed Matter Sciences, National Taiwan University, Taipei 106 (Taiwan);4. Institute of Atomic and Molecular Science, Academia Sinica, Taipei 106 (Taiwan) |
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| Abstract: | We report a systematic comparison study of 3,5‐di(N‐carbazolyl)tetraphenylsilane (SimCP) and N,N′‐dicarbazolyl‐3,5‐benzene (mCP), which are used as the host materials for phosphorescent blue dopants in organic light‐emitting diodes (OLEDs). On the basis of photoexcitation emission spectroscopy, thermal stability analysis, photoelectron analysis, charge transport measurements, and molecular dynamics (MD) simulations, we conclude that the non‐π‐conjugated meta‐substituted triphenylsilyl moiety of SimCP exerts a unique hindering effect on the molecular packing characteristics in the condensed phase. The chemical origin of the superior performance of SimCP over mCP is revealed, and is expected to be helpful for the molecular design of effective host materials for enhancing the performance of blue phosphorescent OLEDs. |
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| Keywords: | Blue‐light emitters Doping Electroluminescence Light‐emitting diodes organic (OLEDs) Phosphorescence |
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