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
The effect of spacer in hybrid white organic light emitting diodes
TL;DR: In this paper, two kinds of highly efficient, bright hybrid white organic light emitting diodes have been fabricated by utilizing ambipolar material 4,4-N,N-dicarbazolebiphenyl (CBP) and unipolar material N,N′-di(naphthalene-1-yl)-N, N′-diphenially-benzidine (NPB) as the spacer, respectively.
Journal ArticleDOI
Multifunctional Organic Emitters for High‐Performance and Low‐Cost Organic Light‐Emitting Didoes
TL;DR: This review highlights recent and current advances in developing bifunctional or multifunctional molecules, with the focus on structures, properties, and applications in OLEDs and organic laser.
Journal ArticleDOI
Solid state solvation effect of a donor–acceptor type fluorescent molecule and its application to white organic light-emitting diodes
TL;DR: In this article, the solid state solvation effect (SSSE) of a donor-acceptor (D-A) type green fluorescent emitter, 3,7-bis(benzimidazol-2-yl)-10-methylphenothiazine (BBMP), was investigated, and a white organic light-emitting diodes (OLEDs) were fabricated by utilizing SSSE.
Journal ArticleDOI
Effects of Sulfur Oxidation on the Electronic and Charge Transport Properties of Fused Oligothiophene Derivatives
TL;DR: In this paper, the effects of chemical oxidation of thienyl sulfur on the modulation of electronic structures and charge transport properties of oligothiophenes, the geometrical structures, molecular reorganization energies upon gaining or losing electrons, molecular ionization potentials (IPs) and electron affinities (EAs), molecular aromaticities, frontier molecular orbitals, and charge mobilities are analyzed in detail to determine the structure-property relationships for the investigated oligophhenes and their corresponding oxidized counterparts.
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Achieving non-doped deep-blue OLEDs by applying bipolar imidazole derivatives
Yi Jia,Sen Wu,Yuteng Zhang,Shigen Fan,Xiaoming Zhao,Hongli Liu,Xiaofei Dong,Shirong Wang,Xianggao Li +8 more
TL;DR: In this article, two novel bipolar deep-blue emitting materials, 2-(4'-(9H-carbazol-9-yl)-[1,1′-biphenyl]-4-yl]-1 (4(tri-fluoromethyl) phenyl)-1H-phenanthro[9,10-d] imidazole (CzB-FMPPI) and 9H-car carbazole, were designed and synthesized.
References
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Organic Electroluminescent Diodes
Ching Wan Tang,Steven A Vanslyke +1 more
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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.