Highly efficient blue electroluminescence based on thermally activated delayed fluorescence

Shuzo Hirata, Yumi Sakai, Kensuke Masui, Hiroyuki Tanaka, Sae Youn Lee, Hiroko Nomura, Nozomi Nakamura, Mao Yasumatsu, Hajime Nakanotani, Qisheng Zhang, Katsuyuki Shizu, Hiroshi Miyazaki, Chihaya Adachi

Research output: Contribution to journalArticle

527 Citations (Scopus)

Abstract

Organic compounds that exhibit highly efficient, stable blue emission are required to realize inexpensive organic light-emitting diodes for future displays and lighting applications. Here, we define the design rules for increasing the electroluminescence efficiency of blue-emitting organic molecules that exhibit thermally activated delayed fluorescence. We show that a large delocalization of the highest occupied molecular orbital and lowest unoccupied molecular orbital in these charge-transfer compounds enhances the rate of radiative decay considerably by inducing a large oscillator strength even when there is a small overlap between the two wavefunctions. A compound based on our design principles exhibited a high rate of fluorescence decay and efficient up-conversion of triplet excitons into singlet excited states, leading to both photoluminescence and internal electroluminescence quantum yields of nearly 100%.

Original languageEnglish
Pages (from-to)330-336
Number of pages7
JournalNature Materials
Volume14
Issue number3
DOIs
Publication statusPublished - Jan 1 2015

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Electroluminescence
Molecular orbitals
electroluminescence
molecular orbitals
Fluorescence
fluorescence
Organic light emitting diodes (OLED)
decay
Quantum yield
Wave functions
organic compounds
Organic compounds
Excited states
Excitons
oscillator strengths
illuminating
Charge transfer
Photoluminescence
light emitting diodes
Lighting

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Highly efficient blue electroluminescence based on thermally activated delayed fluorescence. / Hirata, Shuzo; Sakai, Yumi; Masui, Kensuke; Tanaka, Hiroyuki; Lee, Sae Youn; Nomura, Hiroko; Nakamura, Nozomi; Yasumatsu, Mao; Nakanotani, Hajime; Zhang, Qisheng; Shizu, Katsuyuki; Miyazaki, Hiroshi; Adachi, Chihaya.

In: Nature Materials, Vol. 14, No. 3, 01.01.2015, p. 330-336.

Research output: Contribution to journalArticle

Hirata, S, Sakai, Y, Masui, K, Tanaka, H, Lee, SY, Nomura, H, Nakamura, N, Yasumatsu, M, Nakanotani, H, Zhang, Q, Shizu, K, Miyazaki, H & Adachi, C 2015, 'Highly efficient blue electroluminescence based on thermally activated delayed fluorescence', Nature Materials, vol. 14, no. 3, pp. 330-336. https://doi.org/10.1038/nmat4154
Hirata, Shuzo ; Sakai, Yumi ; Masui, Kensuke ; Tanaka, Hiroyuki ; Lee, Sae Youn ; Nomura, Hiroko ; Nakamura, Nozomi ; Yasumatsu, Mao ; Nakanotani, Hajime ; Zhang, Qisheng ; Shizu, Katsuyuki ; Miyazaki, Hiroshi ; Adachi, Chihaya. / Highly efficient blue electroluminescence based on thermally activated delayed fluorescence. In: Nature Materials. 2015 ; Vol. 14, No. 3. pp. 330-336.
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