Color-Tunable Boron-Based Emitters Exhibiting Aggregation-Induced Emission and Thermally Activated Delayed Fluorescence for Efficient Solution-Processable Nondoped Deep-Blue to Sky-Blue OLEDs

Hyung Jong Kim, Mallesham Godumala, Seong Keun Kim, Jiwon Yoon, Chae Yeong Kim, Hanun Park, Jang Hyuk Kwon, Min Ju Cho, Dong Hoon Choi

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63 Citations (Scopus)

Abstract

Three new color-tunable (deep-blue to sky-blue) and solution-processable emitters—9′-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-9′H-9,3′:6′,9″-tercarbazole (TB-3Cz), 9′-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-9,9″-diphenyl-9H,9′H,9″H-3,3′:6′,3″-tercarbazole (TB-P3Cz), and 9-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-N3,N3,N6,N6-tetraphenyl-9H-carbazole-3,6-diamine (TB-DACz)—are demonstrated, which are cleverly designed and synthesized by appending a boron-fused entity as an electron acceptor to different electron-rich entities containing carbazole derivatives as donors. The thermal, photophysical, electrochemical, and electroluminescent characteristics of all the new materials are extensively investigated. Comprehensive photophysical investigations reveal that these emitters exhibit not only thermally activated delayed fluorescence (TADF) but also aggregation-induced emission (AIE) properties. Consequently, solution-processable organic light-emitting diodes (OLEDs) fabricated using these new materials as nondoped emitters in the emissive layer exhibit a maximum external quantum efficiency (EQE) and Commission Internationale de l'Éclairage (CIE) color coordinates of 9.90% and (0.17, 0.07), respectively, for TB-3Cz; 6.13% and (0.15, 0.08), respectively, for TB-P3Cz; and 6.04% and (0.18, 0.40), respectively, for TB-DACz. As far as it is known, the performance and ultrahigh color purity satisfying the deep-blue CIE coordinates of the National Television System Committee (NTSC) for TB-3Cz and TB-P3Cz are the highest reported thus far for nondoped solution-processable TADF emitters, indicating the great potential of these materials as deep-blue luminogens in OLED applications.

Original languageEnglish
Article number1902175
JournalAdvanced Optical Materials
Volume8
Issue number14
DOIs
Publication statusPublished - 2020 Jul 1

Bibliographical note

Funding Information:
H.J.K. and M.G. contributed equally to this work. The authors acknowledged the financial support from the National Research Foundation of Korea (Grant Nos. NRF2019R1A2C2002647 and NRF2019R1A6A1A11044070) and also thank to Korea Basic Science Institute (KBSi) for allowing the use of MALDI‐TOF MS instrument. D.H.C. particularly thanks for the support from LG Display Co. Limited (Q1830291)

Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • aggregation-induced emission
  • deep-blue to sky-blue emitters
  • nondoped organic light-emitting diodes
  • solution process
  • thermally activated delayed fluorescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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