An Ambipolar BODIPY Derivative for a White Exciplex OLED and Cholesteric Liquid Crystal Laser toward Multifunctional Devices

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• 作者：Marian Chapran ; Enrico Angioni ; Neil J. Findlay ; Benjamin Breig ; Vladyslav Cherpak ; Pavlo Stakhira ; Tell Tuttle ; Dmytro Volyniuk ; Juozas V. Grazulevicius ; Yuriy A. Nastishin ; Oleg D. Lavrentovich ; Peter J. Skabara
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：9
• 期：5
• 页码：4750-4757
• 全文大小：483K
• ISSN：1944-8252

文摘

A new interface engineering method is demonstrated for the preparation of an efficient white organic light-emitting diode (WOLED) by embedding an ultrathin layer of the novel ambipolar red emissive compound 4,4-difluoro-2,6-di(4-hexylthiopen-2-yl)-1,3,5,7,8-pentamethyl-4-bora-3a,4a-diaza-s-indacene (bThBODIPY) in the exciplex formation region. The compound shows a hole and electron mobility of 3.3 × 10^–4 and 2 × 10^–4 cm² V^–1 s^–1, respectively, at electric fields higher than 5.3 × 10⁵ V cm^–1. The resulting WOLED exhibited a maximum luminance of 6579 cd m^–2 with CIE 1931 color coordinates (0.39; 0.35). The bThBODIPY dye is also demonstrated to be an effective laser dye for a cholesteric liquid crystal (ChLC) laser. New construction of the ChLC laser, by which a flat capillary with an optically isotropic dye solution is sandwiched between two dye-free ChLC cells, provides photonic lasing at a wavelength well matched with that of a dye-doped planar ChLC cell.