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Proceedings Paper

Efficient HOMO-LUMO separation by multiple resonance effect toward ultrapure blue thermally activated delayed fluorescence
Author(s): Takuji Hatakeyama; Toshiaki Ikuta; Kazushi Shiren; Kiichi Nakajima; Shintaro Nomura; Jingping Ni
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Paper Abstract

Organic light-emitting diodes (OLEDs) play an important role in the new generation of flat-panel displays. Conventional OLEDs employing fluorescent materials together with triplet–triplet annihilation suffer from a relatively low internal quantum efficiency (IQE) of ~62.5%. On the other hand, the IQE of OLEDs employing phosphorescent or thermally activated delayed fluorescence (TADF) materials can reach ~100%. However, these materials exhibit very broad peaks with a full-width at half-maximum (FWHM) of 70–100 nm and cannot satisfy the color-purity requirements for displays. Therefore, the latest commercial OLED displays employ blue fluorescent materials with a relatively low IQE, and efficient blue emitters with a small FWHM are highly needed. In our manuscript, we present organic molecules that exhibit ultrapure blue fluorescence based on TADF. These molecules consist of three benzene rings connected by one boron and two nitrogen atoms, which establish a rigid polycyclic framework and significant localization of the highest occupied and lowest unoccupied molecular orbitals by a multiple resonance effect. An OLED device based on the new emitter exhibits ultrapure blue emission at 467 nm with an FWHM of 28 nm, Commission Internationale de l’Eclairage (CIE) coordinates of (0.12, 0.13), and an IQE of ~100%, which represent record-setting performance for blue OLED devices.

Paper Details

Date Published: 23 September 2016
PDF: 8 pages
Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 994103 (23 September 2016); doi: 10.1117/12.2239211
Show Author Affiliations
Takuji Hatakeyama, Kwansei Gakuin Univ. (Japan)
Toshiaki Ikuta, JNC Petrochemical Corp. (Japan)
Kazushi Shiren, JNC Petrochemical Corp. (Japan)
Kiichi Nakajima, Kwansei Gakuin Univ. (Japan)
Shintaro Nomura, JNC Petrochemical Corp. (Japan)
Jingping Ni, JNC Petrochemical Corp. (Japan)

Published in SPIE Proceedings Vol. 9941:
Organic Light Emitting Materials and Devices XX
Franky So; Chihaya Adachi; Jang-Joo Kim, Editor(s)

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