Pentacyclic Ladder-Heteraborin Emitters Exhibiting High-Efficiency Blue Thermally Activated Delayed Fluorescence with an Ultrashort Emission Lifetime

被引：65

作者：

Agou, Tomohiro ^{[1
]}

Matsuo, Kyohei ^{[2
]}

Kawano, Rei ^{[1
]}

Park, In Seob ^{[2
]}

Hosoya, Takaaki ^{[1
]}

Fukumoto, Hiroki ^{[1
]}

Kubota, Toshio ^{[1
]}

Mizuhata, Yoshiyuki ^{[3
]}

Tokitoh, Norihiro ^{[3
]}

Yasuda, Takuma ^{[2
]}

机构：

[1] Ibaraki Univ, Grad Sch Sci & Engn, Dept Quantum Beam Sci, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 3168511, Japan

[2] Kyushu Univ, INAMORI Frontier Res Ctr IFRC, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[3] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan

来源：

ACS MATERIALS LETTERS | 2020年 / 2卷 / 01期

关键词：

LIGHT-EMITTING-DIODES; OPTICAL-PROPERTIES; PURE BLUE; UP-CONVERSION; MOLECULES; SINGLET; BORYLATION; MECHANISM;

D O I：

10.1021/acsmaterialslett.9b00433

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

As one of the three primary colors, blue is significant for display and lighting applications and the development of blue-emitting molecules with high quantum efficiency, and color purity for organic light-emitting diodes (OLEDs) remains a key challenge. Herein, a new series of blue thermally activated delayed fluorescence (TADF) materials featuring pi-extended ladder-oxaborin and thiaborin acceptors has been developed. Steady-state and time-resolved photophysical measurements revealed the advantages of the ladder-oxaborin emitter, including a tiny singlet-triplet energy splitting of 10 meV, an ideal photoluminescence quantum yield of 100%, and an ultrashort TADF lifetime of 780 ns. The TADF-OLEDs incorporating the ladder-oxaborin (deep-blue) and thiaborin (sky-blue) emitters achieved significantly high external electroluminescence quantum efficiencies of up to 20.1% and 25.9%, respectively, accompanied by suppressed efficiency roll-offs.

引用

页码：28 / 34

页数：13

共 56 条

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