ニュース《2024年》

【論文関連】城戸・笹部・千葉研究室卒業生の劉冠廷博士と笹部久宏准教授の論文が Chem Eur J の Top10% Most Read Article に選出されました。

2024/03/21

卒業生で九州大学博士研究員の劉冠廷博士と笹部久宏准教授の分子軌道制御による高効率・高色純度青・緑色多重共鳴型 TADF 型発光材料群に関する「Nonbonding/Bonding Molecular Orbital Regulation of Nitrogen‐Boron‐Oxygen‐embedded Blue/Green Multiresonant TADF Emitters with High Efficiency and Color Purity」と題する論文が Wiley Chemistry A European Jounal の Top10% Most Read Article (Jan 2022-Dec 2022) に選出されました！

本研究は、JSPS 科研費（基盤研究B, 20H02807）、NEDO 官民による若手研究者発掘支援事業 (21502128-0)、JST センター・オブ・イノベーションプログラム（COI) の助成を受けたものです。

Title: Nonbonding/Bonding Molecular Orbital Regulation of Nitrogen–Boron–Oxygen-embedded Blue/Green Multiresonant TADF Emitters with High Efficiency and Color Purity
By Guanting Liu, Hisahiro Sasabe*, Kengo Kumada, Hiroki Arai, and Junji Kido*, Chem. Eur. J, 2022, 28, e202201605.

Abstract: In this study, we synthesized and characterized multiresonant thermally activated delayed fluorescent (TADF) materials embedded with nitrogen–boron–oxygen (N–B–O), exhibiting color- tunability between blue and green, namely NBO, m-DiNBO, and p-DiNBO. The three emitter materials showed a high photoluminescence quantum yield (PLQY) and a state-of-the-art narrow full width at half maximum (FWHM) of 96%/25 nm, 87%/17 nm, and 99%/19 nm, respectively. For m-DiNBO and p-DiNBO, the emission color could be tuned from blue to green by regulating the nonbonding/bonding molecular orbital characters. Owing to the expanded planar molecular structure, m-DiNBO and p-DiNBO showed high horizontal dipole ratio (Q) of 88% and 92%, respectively. OLEDs were prepared with NBO, m-DiNBO, and p-DiNBO, exhibiting high external quantum efficiencies of 16.8%, 24.2%, and 21.6%, respectively. NBO and m-DiNBO exhibited pure-blue emission with CIE coordinates of (0.137, 0.142) and (0.126, 0.098), respectively. p-DiNBO showed pure-green emission with a CIE coordinate of (0.258, 0.665).

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