Journal ArticleDOI
A non-doped phosphorescent organic light-emitting device with above 31% external quantum efficiency
Qi Wang,Qi Wang,Qi Wang,Iain W. H. Oswald,Xiaolong Yang,Guijiang Zhou,Huiping Jia,Qiquan Qiao,Yonghua Chen,Jason Hoshikawa-Halbert,Bruce E. Gnade +10 more
TLDR
A non-doped phosphorescent organic light-emitting diode (PhOLED) based on this emitter achieves (31.1 ± 0.1)% external quantum efficiency without any out-coupling, which shows that a non- doped PhOLED can be comparable in efficiency to the best doped devices with very complicated device structures.Abstract:
The demonstrated square-planar Pt(II)-complex has reduced triplet-triplet quenching and therefore a near unity quantum yield in the neat thin film. A non-doped phosphorescent organic light-emitting diode (PhOLED) based on this emitter achieves (31.1 ± 0.1)% external quantum efficiency without any out-coupling, which shows that a non-doped PhOLED can be comparable in efficiency to the best doped devices with very complicated device structures.read more
Citations
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Journal ArticleDOI
Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices.
TL;DR: The main emphasis lies on the important role played by the main-group element groups in addressing the key issues of both phosphorescent emitters and their host materials to fulfill high-performance phosphorescent OLEDs.
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
Approaches for fabricating high efficiency organic light emitting diodes
TL;DR: In this article, the efficiency records of OLED devices using fluorescent, phosphorescent, and thermally activated delay fluorescent materials are summarized and a review of all the available efficiency-effective device architectural approaches, which include using thin layer structures, low carrier injection barriers, high carrier mobility, balanced carrier injection, effective carrier confinement, effective host-to-guest energy transfer, effective recombination zone, effective exciton generation on the host and p-i-n structures, and tandem structures.
Journal ArticleDOI
A versatile thermally activated delayed fluorescence emitter for both highly efficient doped and non-doped organic light emitting devices
Wei-Lung Tsai,Ming-Hao Huang,Wei-Kai Lee,Yi-Jiun Hsu,Kuan-Chung Pan,Yi Hsiang Huang,Hao-Chun Ting,Monima Sarma,Yu-Yi Ho,Hu Hung-Chieh,Chung-Chia Chen,Meng-Ting Lee,Ken-Tsung Wong,Chung-Chih Wu +13 more
TL;DR: A thermally activated delayed fluorescent emitter (DMAC-TRZ) was reported either as the emitting dopant in a host or as the non-doped (neat) emitting layer to achieve high EL EQEs of up to 26.5% and 20% in OLEDs, respectively.
Journal ArticleDOI
Design strategy for 25% external quantum efficiency in green and blue thermally activated delayed fluorescent devices.
TL;DR: Carbazole- and triazine-derived thermally activated delayed fluorescent (TADF) emitters, with three donor units and an even distribution of the highest occupied molecular orbital, achieve high external quantum efficiencies of above 25% in blue and green TADF devices.
References
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Journal ArticleDOI
Nearly 100% internal phosphorescence efficiency in an organic light emitting device
TL;DR: In this paper, the authors demonstrate very high efficiency electrophosphorescence in organic light-emitting devices employing a phosphorescent molecule doped into a wide energy gap host, achieving a maximum external quantum efficiency of 19.0±1.0 and luminous power efficiency of 60±5 lm/W.
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Electroluminescence of doped organic thin films
TL;DR: In this paper, a multilayer-doped EL was constructed using a hole-transport layer and a luminescent layer, and the electron-hole recombination and emission zones can be confined to about 50 A near the hole.
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Photophysics of preassociated pyrenes in aqueous polymer solutions and in other organized media
Journal ArticleDOI
Transient analysis of organic electrophosphorescence. II. Transient analysis of triplet-triplet annihilation
TL;DR: Baldo et al. as mentioned in this paper showed that the observed decrease in electrophosphorescent intensity in organic light-emitting devices at high current densities is principally due to triplet-triplet annihilation.
Journal ArticleDOI
Extremely efficient flexible organic light-emitting diodes with modified graphene anode
Tae Hee Han,Youngbin Lee,Mi Ri Choi,Seonghoon Woo,Sang-Hoon Bae,Byung Hee Hong,Jong Hyun Ahn,Tae-Woo Lee +7 more
TL;DR: In this paper, a high-work-function, low-sheet-resistance graphene anode was used to improve the luminous efficiency of organic light-emitting diodes (OLEDs).