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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Solution processed multilayer red, green and blue phosphorescent organic light emitting diodes using carbazole dendrimer as a host
TL;DR: In this paper, a novel carbazole dendrimer was synthesized, which shows an excellent thermal stability with a high glass transition temperature of 283°C and decomposition temperature of 487°C.
Journal ArticleDOI
In‐Planar‐Electrodes Organic Light‐Emitting Devices for Smart Lighting Applications
Journal ArticleDOI
Dipolar 1,3,6,8-tetrasubstituted pyrene-based blue emitters containing electro-transporting benzimidazole moieties: Syntheses, structures, optical properties, electrochemistry and electroluminescence
TL;DR: A series of dipolar 1,3,6,8-tetrasubstituted pyrene-based compounds (py1, py2, mpy1 and mpy2) were designed and synthesized with two 4-tert-butylphenyl segments at 1,8 positions and two electron-transporting benzimidazole moieties at 3,6-sites of the pyrene core as discussed by the authors.
Journal ArticleDOI
Molecular Orientations of Delayed Fluorescent Emitters in a Series of Carbazole-Based Host Materials.
Hisahiro Sasabe,Yuki Chikayasu,Satoru Ohisa,Hiroki Arai,Tatsuya Ohsawa,Ryutaro Komatsu,Yuichiro Watanabe,Daisuke Yokoyama,Junji Kido +8 more
TL;DR: The results indicate that π-π stacking, CH/n (n = O, N) weak hydrogen bonds, and multiple CH/π contacts greatly induce horizontal orientation of the TADF emitters in addition to the molecular shape anisotropy.
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Novel microlens arrays with embedded Al2O3 nanoparticles for enhancing efficiency and stability of flexible polymer light-emitting diodes
TL;DR: In this article, the authors have fabricated novel microlens arrays based on an organic-inorganic hybrid sol on a flexible substrate, which can not only extract more light but also block gas molecules, and further light-extraction from Al2O3 nanoparticles in the arrays was confirmed by an increase in diffusive reflectance and photoluminescence intensity.
References
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Organic Electroluminescent Diodes
Ching Wan Tang,Steven A Vanslyke +1 more
TL;DR: In this article, a double-layer structure of organic thin films was prepared by vapor deposition, and efficient injection of holes and electrons was provided from an indium-tinoxide anode and an alloyed Mg:Ag cathode.
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Very high-efficiency green organic light-emitting devices based on electrophosphorescence
TL;DR: In this paper, the performance of an organic light-emitting device employing the green electrophosphorescent material, fac tris(2-phenylpyridine) iridium [Ir(ppy)3] doped into a 4,4′-N,N′-dicarbazole-biphenyl host was described.
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White organic light-emitting diodes with fluorescent tube efficiency
Sebastian Reineke,Frank Lindner,Gregor Schwartz,Nico Seidler,Karsten Walzer,Björn Lüssem,Karl Leo +6 more
TL;DR: An improved OLED structure which reaches fluorescent tube efficiency and focuses on reducing energetic and ohmic losses that occur during electron–photon conversion, which could make white-light OLEDs, with their soft area light and high colour-rendering qualities, the light sources of choice for the future.
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Charge Transport in Disordered Organic Photoconductors a Monte Carlo Simulation Study
Journal ArticleDOI
Management of singlet and triplet excitons for efficient white organic light-emitting devices
Yiru Sun,Noel C. Giebink,Hiroshi Kanno,Biwu Ma,Mark E. Thompson,Stephen R. Forrest,Stephen R. Forrest +6 more
TL;DR: This device challenges incandescent sources by exhibiting total external quantum and power efficiencies that peak at 18.7 ± 0.6 lm W-1, respectively, and two distinct modes of energy transfer within this device serve to channel nearly all of the triplet energy to the phosphorescent dopants, retaining the singlet energy exclusively on the blue fluorescent dopant.