有机发光二极管
接受者
磷光
光致发光
材料科学
发光
量子效率
激子
单重态
激发态
光电子学
分子内力
准分子
光化学
纳米技术
化学
荧光
原子物理学
物理
光学
立体化学
量子力学
图层(电子)
凝聚态物理
作者
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
出处
期刊:Nature Materials
[Springer Nature]
日期:2020-06-15
卷期号:19 (12): 1332-1338
被引量:489
标识
DOI:10.1038/s41563-020-0710-z
摘要
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.
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