Journal ArticleDOI
Development of high performance OLEDs for general lighting
Hisahiro Sasabe,Junji Kido +1 more
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TLDR
The first white organic light-emitting device (OLED) was developed in 1993, and the power efficiency and lifetime of this white OLED were reportedly only < 1 lm W−1 and < 1 day, respectively.Abstract:
Since the development of the first white organic light-emitting device (OLED) in 1993, twenty years have passed. The power efficiency and lifetime of this white OLED were reportedly only <1 lm W−1 and <1 day, respectively. However, recent rapid advances in material chemistry have enabled the use of white OLEDs for general lighting. In 2012, white OLED panel efficiency has reached 90 lm W−1 at 1000 cd m−2, and a tandem white OLED panel has realized a lifetime of over 100 000 hours. What is more important in OLEDs is to shed clear light on the new design products, such as transparent lighting panels and luminescent wallpapers. These fascinating features enable OLEDs as a whole new invention of artificial lighting. In this review, we would like to overview the recent developments of white OLED, especially three key elemental technologies related to material chemistry: (1) low operating voltage technology, (2) phosphorescent OLED technology and (3) multi-photon emission (MPE) device technology.read more
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Journal ArticleDOI
Perovskite solar cells employing organic charge-transport layers
Olga Malinkiewicz,Aswani Yella,Yong Hui Lee,Guillermo Mínguez Espallargas,Michael Graetzel,Mohammad Khaja Nazeeruddin,Henk J. Bolink +6 more
TL;DR: In this article, a perovskite solar cell was fabricated by using room-temperature deposition processes and the cells were based on a layer of methylammonium lead iodide perovsite that is prepared by sublimation in a high-vacuum chamber and sandwiched between two thin organic charge-transport layers.
Journal ArticleDOI
Anthraquinone-Based Intramolecular Charge-Transfer Compounds: Computational Molecular Design, Thermally Activated Delayed Fluorescence, and Highly Efficient Red Electroluminescence
Qisheng Zhang,H. Kuwabara,William J. Potscavage,Shuping Huang,Yasuhiro Hatae,Takumi Shibata,Chihaya Adachi +6 more
TL;DR: It is demonstrated that increasing the distance between donor (D) and acceptor (A) in intramolecular-charge-transfer molecules is a promising strategy for simultaneously achieving small ΔE(ST) and large k(F), which is in good agreement with those predicted by corrected time-dependent density functional theory.
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
White Polymer Light-Emitting Devices for Solid-State Lighting: Materials, Devices, and Recent Progress
TL;DR: The recent advances in WPLEDs are summarized with special attention paid to the design of novel luminescent dopants and device structures that minimize the gap from other lighting sources such as fluorescent lamps, light-emitting diodes based on inorganic semiconductors, and vacuum-deposited small-molecular devices, thus rendering WPL EDs equally competitive.
Patent
Organic Electroluminescent Materials and Devices
Chuanjun Xia,Chun Lin +1 more
TL;DR: In this paper, novel tricarbazole compounds with appropriate HOMO and LUMO energies can be obtained for use as materials in a secondary hole transport layer, by appropriately selecting the nature of the tricarazole substituents.
References
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Journal ArticleDOI
Tuning Energy Levels of Electron‐Transport Materials by Nitrogen Orientation for Electrophosphorescent Devices with an ‘Ideal’ Operating Voltage
TL;DR: A series of 1,3,5-triazine-core-containing electron-transport materials (ETMs) are reported on as an undoped ETL, whose energy levels can be tuned by introducing pyridine rings on the periphery of the molecule and also orientation of nitrogen.
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2-(2-Methoxyphenyl)-1,3-dimethyl-1H-benzoimidazol-3-ium Iodide as a New Air-Stable n-Type Dopant for Vacuum-Processed Organic Semiconductor Thin Films
TL;DR: 2-Methoxyphenyl)-1,3-dimethyl-1H-benzoimidazol-3-ium iodide (o-MeO-DMBI-I) can be stored and handled in air for extended periods without degradation and is thus promising for various organic electronic devices.
Journal ArticleDOI
Phosphine oxide derivatives for organic light emitting diodes
Soon Ok Jeon,Jun Yeob Lee +1 more
TL;DR: In this article, the use of phosphine oxide derivatives with various functional groups as host and ETMs in phosphorescent organic light-emitting diodes is reviewed and the strong electron withdrawing properties have allowed high external quantum efficiencies over 20% to be demonstrated.
Journal ArticleDOI
Molecular Stacking Induced by Intermolecular C–H···N Hydrogen Bonds Leading to High Carrier Mobility in Vacuum-Deposited Organic Films
TL;DR: In this paper, it was shown that the intermolecular C-H···N hydrogen bonds can be formed even in vacuum-deposited organic films having flat interfaces.
Journal ArticleDOI
Ultra-high efficiency by multiple emission from stacked organic light-emitting devices
TL;DR: In this article, the authors investigated the charge generation characteristics of intermediate layer, consisting of an organic acceptor material 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HAT-CN6) and an organic donor material N,N′-di(naphthalene-1yl)-N,N´-diphenylbenzidine (NPD), for a stacked organic light-emitting device (OLED).