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
Advantages and disadvantages of vacuum-deposited and spin-coated amorphous organic semiconductor films for organic light-emitting diodes
TL;DR: In this article, the authors compare vacuum-deposited and spin-coated amorphous organic semiconductor films used for OLEDs mainly by ellipsometry and demonstrate the critical differences in film density, transition temperature, and molecular orientation.
Journal ArticleDOI
Strategy for designing electron donors for thermally activated delayed fluorescence emitters
Katsuyuki Shizu,Katsuyuki Shizu,Hiroyuki Tanaka,Motoyuki Uejima,Tohru Sato,Kazuyoshi Tanaka,Hironori Kaji,Chihaya Adachi +7 more
TL;DR: In this article, an electron donor containing carbazolyl and diphenylamino groups was developed to increase the structural diversity of TADF emitters, and the electron donor was combined with a quinoxaline-based acceptor.
Journal ArticleDOI
Hole-transporting materials for organic light-emitting diodes: an overview
Shahnawaz,Sujith Sudheendran Swayamprabha,Mangey Ram Nagar,Rohit Ashok Kumar Yadav,Sanna Gull,Deepak Kumar Dubey,Jwo-Huei Jou +6 more
TL;DR: In this paper, the crucial material tactics employed to obtain high-performance OLED devices with small molecules, carbazole, fluorine, cross-linked, and metal oxide-based hole transport materials are reviewed.
Journal ArticleDOI
Achieving efficient violet-blue electroluminescence with CIE y 6% from naphthyl-linked phenanthroimidazole–carbazole hybrid fluorophores
TL;DR: This study provides a new pathway for the design of high-performance violet-blue emitters with a D-π-A architecture in organic electroluminescence applications and demonstrates that the pattern of the π spacers has significant influence on the photophysical properties.
Journal ArticleDOI
From Mononuclear to Dinuclear Iridium(III) Complex: Effective Tuning of the Optoelectronic Characteristics for Organic Light-Emitting Diodes
TL;DR: The theoretical calculation results show that the dinuclear complexes adopt a unique molecular orbital spatial distribution pattern, which plays the key role of determining their photophysical and electrochemical properties.
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.
Journal ArticleDOI
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.