Journal ArticleDOI
Ultrapure Blue Thermally Activated Delayed Fluorescence Molecules: Efficient HOMO–LUMO Separation by the Multiple Resonance Effect
Takuji Hatakeyama,Takuji Hatakeyama,Shiren Kazushi,Kiichi Nakajima,Shintaro Nomura,Soichiro Nakatsuka,Keisuke Kinoshita,Jingping Ni,Yohei Ono,Toshiaki Ikuta +9 more
TLDR
Ultrapure blue-fluorescent molecules based on thermally activated delayed fluorescence are developed that exhibit a deep blue emission at 467 nm with a full-width at half-maximum of 28 nm and an internal quantum efficiency of ≈100%, which represent record-setting performance for blue OLED devices.Abstract:
Ultrapure blue-fluorescent molecules based on thermally activated delayed fluorescence are developed. Organic light-emitting diode (OLED) devices employing the new emitters exhibit a deep blue emission at 467 nm with a full-width at half-maximum of 28 nm, CIE coordinates of (0.12, 0.13), and an internal quantum efficiency of ≈100%, which represent record-setting performance for blue OLED devices.read more
Citations
More filters
Journal ArticleDOI
Recent advances in organic thermally activated delayed fluorescence materials.
Zhiyong Yang,Zhu Mao,Zongliang Xie,Yi Zhang,Siwei Liu,Juan Zhao,Jiarui Xu,Zhenguo Chi,Matthew P. Aldred +8 more
TL;DR: This review summarizes and discusses the latest progress concerning this rapidly developing research field, in which the majority of the reported TADF systems are discussed, along with their derived structure-property relationships, TadF mechanisms and applications.
Journal ArticleDOI
Purely Organic Thermally Activated Delayed Fluorescence Materials for Organic Light-Emitting Diodes.
TL;DR: A comprehensive review of TADF materials is presented, with a focus on linking their optoelectronic behavior with the performance of the organic light-emitting diode (OLED) and related EL devices.
Journal ArticleDOI
All-organic thermally activated delayed fluorescence materials for organic light-emitting diodes
TL;DR: In this paper, the molecular design, photophysical characteristics and OLEDs composed of small-molecule, dendritic and polymeric TADF emitters are discussed.
Journal ArticleDOI
Molecular Design Strategy of Organic Thermally Activated Delayed Fluorescence Emitters
TL;DR: In this article, the authors reviewed molecular design strategies of organic-based TADF emitters by classifying them into several categories depending on the material parameters required for the TADFs.
Journal ArticleDOI
Narrowband deep-blue organic light-emitting diode featuring an organoboron-based emitter
Yasuhiro Kondo,Kazuki Yoshiura,Sayuri Kitera,Hiroki Nishi,Susumu Oda,Hajime Gotoh,Yasuyuki Sasada,Motoki Yanai,Takuji Hatakeyama +8 more
TL;DR: In this article, a thermally activated delayed-fluorescence material that exhibits ultrapure blue emission with full width at half-maximum of just 14nm was presented, where the multiple resonance effect of the boron and nitrogen atoms induces significant localization of the highest occupied and lowest unoccupied molecular orbitals on different atoms to minimize not only the vibronic coupling between the ground state (S0) and the singlet excited states (S1) but also the energy gap between the S1 state and triplet excited state (T1).
References
More filters
Journal ArticleDOI
Organic Electroluminescent Diodes
Ching Wan Tang,Steven A Vanslyke +1 more
TL;DR: In this article, a double-layer structure of organic thin films was prepared by vapor deposition, and efficient injection of holes and electrons was provided from an indium-tinoxide anode and an alloyed Mg:Ag cathode.
Journal ArticleDOI
Highly efficient phosphorescent emission from organic electroluminescent devices
Marc A. Baldo,D. F. O’Brien,Yujian You,Andrei Shoustikov,Scott Sibley,Scott Sibley,Mark E. Thompson,Stephen R. Forrest +7 more
TL;DR: In this article, a host material doped with the phosphorescent dye PtOEP (PtOEP II) was used to achieve high energy transfer from both singlet and triplet states.
Journal ArticleDOI
Highly efficient organic light-emitting diodes from delayed fluorescence
Hiroki Uoyama,Kenichi Goushi,Kenichi Goushi,Katsuyuki Shizu,Hiroko Nomura,Chihaya Adachi,Chihaya Adachi +6 more
TL;DR: A class of metal-free organic electroluminescent molecules in which the energy gap between the singlet and triplet excited states is minimized by design, thereby promoting highly efficient spin up-conversion from non-radiative triplet states to radiative singlet states while maintaining high radiative decay rates.
Journal ArticleDOI
Efficient blue organic light-emitting diodes employing thermally activated delayed fluorescence
Qisheng Zhang,Bo Li,Shuping Huang,Hiroko Nomura,Hiroyuki Tanaka,Chihaya Adachi,Chihaya Adachi +6 more
TL;DR: In this article, a blue organic light-emitting diodes that harness thermally activated delayed fluorescence was realized with an external quantum efficiency of 19.5% and reduced roll-off at high luminance.
Journal ArticleDOI
Design of Efficient Thermally Activated Delayed Fluorescence Materials for Pure Blue Organic Light Emitting Diodes
Qisheng Zhang,Jie Li,Katsuyuki Shizu,Shuping Huang,Shuzo Hirata,Hiroshi Miyazaki,Chihaya Adachi +6 more
TL;DR: TADF has been characterized for a carbazole/sulfone derivative in both solutions and doped films and a pure blue organic light emitting diode (OLED) based on this compound demonstrates a very high external quantum efficiency (EQE) of nearly 10% at low current density.