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
Highly efficient fluorescent-phosphorescent triplet-harvesting hybrid organic light-emitting diodes
Marina E. Kondakova,Joseph Charles Deaton,Thomas D. Pawlik,David J. Giesen,Denis Y. Kondakov,Ralph H. Young,Tommie L. Royster,Dustin L. Comfort,Joel D. Shore +8 more
TL;DR: In this paper, a triplet-harvesting mechanism for hybrid organic light-emitting diodes (OLEDs) is presented. But the triplets are generated in the recombination zone and diffuse through a spacer layer to one or more phosphorescent LEL(s).
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Origin of Enhanced Hole Injection in Inverted Organic Devices with Electron Accepting Interlayer
TL;DR: In this paper, a substantial enhancement in hole injection efficiency is demonstrated when an electron accepting interlayer is evaporated on top of the hole transporting layer (HTL) in an inverted device along with a top hole injection anode.
Journal ArticleDOI
Organic Electroluminescent Devices Having Metal Complexes as Cathode Interface Layer
TL;DR: In this article, a cathode system composed of metal complexes was developed for organic electroluminescent (EL) devices, where metal complexes such as mono(8-quinolinolato) lithium (Liq) were used as the interface layer in combination with metallic Al as the cathode material.
Journal ArticleDOI
Ultra high-efficiency multi-photon emission blue phosphorescent OLEDs with external quantum efficiency exceeding 40%
TL;DR: In this paper, the authors developed high-efficiency multi-photon emission (MPE) blue phosphorescent OLEDs with external quantum efficiency exceeding 40% at 100cdm−2.
Journal ArticleDOI
Enhancement of electron transport by horizontal molecular orientation of oxadiazole planar molecules in organic amorphous films
TL;DR: In this article, the electrical and optical properties of two oxadiazole derivatives were investigated and the effect of molecular orientation on charge transport characteristics in vacuum-deposited organic amorphous films was demonstrated.