An ambipolar BODIPY derivative for a white exciplex OLED and cholesteric liquid crystal laser towards multi-functional devices

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

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Abstract

A new interface engineering method is demonstrated for the preparation of an efficient white organic light emitting diode (WOLED) by embedding an ultra-thin layer of the novel ambipolar red emissive compound 4,4-di-fluoro-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 cm2 V-1 s-1 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.
Original languageEnglish
Pages (from-to)4750-4757
Number of pages8
JournalACS Applied Materials and Interfaces
Volume9
Issue number5
Early online date24 Jan 2017
DOIs
Publication statusPublished - 8 Feb 2017

Keywords

  • organic light emitting diodes (OLEDs)
  • white light
  • exciplex
  • BODIPY dye
  • cholesteric liquid crystal (ChLC) laser

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