Journal ArticleDOI
Highly efficient luminescence from space-confined charge-transfer emitters.
Xun Tang,Lin-Song Cui,Hong-Cheng Li,Alexander J. Gillett,Florian Auras,Yang-Kun Qu,Cheng Zhong,Saul T. E. Jones,Zuo-Quan Jiang,Richard H. Friend,Liang-Sheng Liao +10 more
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TLDR
The use of rigid linkers to control the relative position and interaction of donor and acceptor units in exciplex emitters leads to the realization of organic light-emitting devices with enhanced external quantum efficiency.Abstract:
Charge-transfer (CT) complexes, formed by electron transfer from a donor to an acceptor, play a crucial role in organic semiconductors. Excited-state CT complexes, termed exciplexes, harness both singlet and triplet excitons for light emission, and are thus useful for organic light-emitting diodes (OLEDs). However, present exciplex emitters often suffer from low photoluminescence quantum efficiencies (PLQEs), due to limited control over the relative orientation, electronic coupling and non-radiative recombination channels of the donor and acceptor subunits. Here, we use a rigid linker to control the spacing and relative orientation of the donor and acceptor subunits, as demonstrated with a series of intramolecular exciplex emitters based on 10-phenyl-9,10-dihydroacridine and 2,4,6-triphenyl-1,3,5-triazine. Sky-blue OLEDs employing one of these emitters achieve an external quantum efficiency (EQE) of 27.4% at 67 cd m−2 with only minor efficiency roll-off (EQE = 24.4%) at a higher luminous intensity of 1,000 cd m−2. As a control experiment, devices using chemically and structurally related but less rigid emitters reach substantially lower EQEs. These design rules are transferrable to other donor/acceptor combinations, which will allow further tuning of emission colour and other key optoelectronic properties. The use of rigid linkers to control the relative position and interaction of donor and acceptor units in exciplex emitters leads to the realization of organic light-emitting devices with enhanced external quantum efficiency.read more
Citations
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Journal ArticleDOI
Organic luminescent materials: The concentration on aggregates from aggregation-induced emission
Journal ArticleDOI
Circularly Polarized Thermally Activated Delayed Fluorescence Emitters in Through-Space Charge Transfer on Asymmetric Spiro Skeletons
Sheng-Yi Yang,Ya-Kun Wang,Chen-Chen Peng,Zheng-Guang Wu,Shuai Yuan,You-Jun Yu,Hao Li,Tong-Tong Wang,Hong-Cheng Li,You-Xuan Zheng,Zuo-Quan Jiang,Liang-Sheng Liao,Liang-Sheng Liao +12 more
TL;DR: This work describes a strategy to produce circularly polarized thermally activated delayed fluorescence (CP-TADF) using a set of two structurally similar organic emitters SFST and SFOT, whose spiro architectures containing asymmetric donors result in chirality.
Journal ArticleDOI
Realizing Record-High Electroluminescence Efficiency of 31.5 % for Red Thermally Activated Delayed Fluorescence Molecules
Zheyi Cai,Xing Wu,Hao Liu,Jingjing Guo,Dezhi Yang,Dongge Ma,Zujin Zhao,Ben Zhong Tang,Ben Zhong Tang +8 more
TL;DR: T tailor-made red TADF molecules comprised of an electron-withdrawing pyrazino[2,3-f][1,10]phenanthroline-2, 3-dicarbonitrile core and various electron-donating triarylamines are developed, which can form intramolecular hydrogen-bonding, conducive to improving emission efficiency and promoting horizontal orientation by increasing molecular rigidity and planarity.
Journal ArticleDOI
In situ photodeposition of platinum clusters on a covalent organic framework for photocatalytic hydrogen production
Yi-Meng Li,Huijie He,Lei Sun,Honglei Wang,Xuying Fang,Yanliang Zhao,Daoyuan Zheng,Yuehong Qi,Zhen Li,Wei-Qiao Deng +9 more
TL;DR: In this article , a strategy to in situ photodeposit platinum clusters as cocatalyst on a covalent organic framework was reported, which makes it an efficient photocatalyst for light-driven hydrogen evolution.
Journal ArticleDOI
Face-to-Face Orientation of Quasiplanar Donor and Acceptor Enables Highly Efficient Intramolecular Exciplex Fluorescence
TL;DR: Light is shed on the importance of conformation control for achieving high-efficiency intramolecular exciplex emitters with precisely controlled alignment of the donor and acceptor segments in TSCT emitters.
References
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Journal ArticleDOI
Highly efficient organic light-emitting diodes from delayed fluorescence
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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
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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.