Kyushu University · Materials Science
이 교수의 연구실은 유기발광다이오드(OLED)의 고성능 및 고색순도 발광을 실현하기 위한 새로운 유기발광 물질의 설계와 기초 메커니즘 규명을 중심으로 연구를 진행하고 있습니다. 특히 열활성화지연형 발광(TADF)과 다중공명(MR) 효과를 접목한 유기붕소 기반 발광체를 핵심으로 하여, 깊은 blue 발광, 높은 효율성, 초박편대 방출을 동시에 구현하는 신소재 개발에 주력하고 있습니다. 또한, 전자구조 제어와 분자 설계 원리를 기반으로 한 체계적이고 예측 가능한 발광 물질 설계 전략을 개발하고 있습니다.
Figures are computed from collected data and may differ slightly.
Abstract Thermally activated delayed fluorescence (TADF) materials, which enable the full harvesting of singlet and triplet excited states for light emission, are expected as the third‐generation emitters for organic light‐emitting diodes (OLEDs), superseding the conventional fluorescence and phosphorescence materials. High photoluminescence quantum yield ( Φ PL ), narrow‐band emission (or high color purity), and short delayed fluorescence lifetime are all strongly desired for practical applicat
To achieve an ultimate wide color gamut for ultrahigh-definition displays, there is great demand for the development of organic light-emitting diodes (OLEDs) enabling monochromatic, ultrapure blue electroluminescence (EL). Herein, high-efficiency and ultrapure blue OLEDs based on polycyclo-heteraborin multi-resonance thermally activated delayed fluorescence (MR-TADF) materials, BOBO-Z, BOBS-Z, and BSBS-Z, are reported. The key to the design of the present luminophores is the exquisite combinatio
Purely organic light‐emitting materials, which can harvest both singlet and triplet excited states to offer high electron‐to‐photon conversion efficiencies, are essential for the realization of high‐performance organic light‐emitting diodes (OLEDs) without using precious metal elements. Donor–acceptor architectures with an intramolecular charge‐transfer excited state have been proved to be a promising system for achieving these requirements through a mechanism of thermally activated delayed fluo
Narrowband emissive organoboron emitters featuring the multi-resonance (MR) effect have now become a critical material component for constructing high-performance organic light-emitting diodes (OLEDs) with pure emission colors. These MR organoboron emitters are capable of exhibiting high-efficiency narrowband thermally activated delayed fluorescence (TADF) by allowing triplet-to-singlet reverse intersystem crossing (RISC). However, RISC involving spin-flip exciton upconversion is generally the r
Deep-blue emitters that can harvest both singlet and triplet excited states to give high electron-to-photon conversion efficiencies are highly desired for applications in full-color displays and white lighting devices based on organic light-emitting diodes (OLEDs). Thermally activated delayed fluorescence (TADF) molecules based on highly twisted donor-acceptor (D-A) configurations are promising emitting dopants for the construction of efficient deep-blue OLEDs. In this study, a simple and versat
High-performance pure blue thermally activated delayed fluorescence (TADF) emitters consisting of pyrimidine and diphenylacridan units are developed.
Abstract A highly efficient blue thermally activated delayed fluorescence (TADF) material based on phenazaborin and spiroacridan units was developed. A blue-emitting organic light-emitting diode containing the phenazaborin derivative as a TADF emitter exhibited a high external electroluminescence quantum efficiency of 18.2%.
Abstract Deep‐blue organic light‐emitting diodes (OLEDs) featuring thermally activated delayed fluorescence (TADF) are experiencing growing demand, especially for full‐color display applications, as they can harvest both singlet and triplet excitons to achieve high electron‐to‐photon conversion efficiencies. However, deep‐blue TADF materials that can achieve sufficiently high electroluminescence (EL) efficiencies at a practical luminance and high emission color purity remain exceedingly rare. He
Thermally activated delayed fluorescence-based organic light-emitting diodes (TADF-OLEDs) have recently attracted tremendous research interest as next-generation optoelectronic devices. However, there are a limited number of host materials with an appropriately high lowest-excited triplet energy (E<sub>T</sub>) and bipolar charge transport properties for high-efficiency TADF-OLEDs. Moreover, these host materials should have high thermal and morphological stabilities. In this study, we develop no
Abstract Narrowband emissive organoboron emitters featuring the multi‐resonance (MR) effect have now become a critical material component for constructing high‐performance organic light‐emitting diodes (OLEDs) with pure emission colors. These MR organoboron emitters are capable of exhibiting high‐efficiency narrowband thermally activated delayed fluorescence (TADF) by allowing triplet‐to‐singlet reverse intersystem crossing (RISC). However, RISC involving spin‐flip exciton upconversion is genera
Abstract Herein, a facile strategy for switching luminescent properties between normal fluorescence and thermally activated delayed fluorescence (TADF) is presented. Two luminophoric molecules, VPN‐Ph and VPN‐H, combining phthalonitrile as an electron‐accepting core and triphenylamines as electron‐donating peripheries with and without two phenyl groups, are newly developed. A comparative study on their structural and photophysical properties is conducted. While non‐phenyl VPN‐H does not exhibit
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
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