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
Template-Assisted Benzannulation Route to Pentacene and Tetracene Derivatives and its Application to Construct Amphiphilic Acenes That Self-Assemble into Helical Wires.
TL;DR: A template-directed approach to pentacene derivatives is described, which is flexible enough to generate an array of acene derivatives with substitution patterns that were hitherto difficult to access.
Journal ArticleDOI
Highly efficient solution processed OLEDs based on iridium complexes with steric phenylpyridazine derivative
TL;DR: In this article, four bis-cyclometalated iridium complexes with phenylpyridazine derivative ligands were synthesized under mild reaction conditions, in which tpp (tppH = 3, 6-bis(4- (trifluoromethyl)phenyl)pyridine) or ttp (ttpH = 5 s, 8 s)-1,4-bis-diphenyl-5,6,7,8-tetrahydro-5-8-thanophthalazine) was used as the primary
Journal ArticleDOI
Blue organic light-emitting diodes based on spiro[fluorene-indeno]pyridine derivatives
Sujin Jeong,Changmin Kim,Se Hyun Kim,Dong Young Kim,Song Eun Lee,Young Kwan Kim,Seung Soo Yoon +6 more
TL;DR: In this paper, two blue fluorescent materials based on spiro[9H-fluorene-9, 5′-[5H] indeno[1, 2-b] pyridine via Buchwald-Hartwig amination and Suzuki coupling reaction were synthesized.
Journal ArticleDOI
Microflowers formed by complexation-driven self-assembly between palladium(II) and bis-theophyllines: immortal catalyst for C–C cross-coupling reactions
TL;DR: In this article, a new heterogeneous Pd catalytic system was established in which the catalyst is a nanopetal-gathered flower-like microsphere self-assembled from PdCl2 and alkyl-linked bis-theophyllines.
Journal ArticleDOI
Microstructural Characterization of Organic Heterostructures by (Transmission) Electron Microscopy
Benedikt Haas,Katharina I. Gries,Tobias Breuer,Ines Häusler,Ines Häusler,Gregor Witte,Kerstin Volz +6 more
TL;DR: In this article, the structure and morphology of codeposited films of pentacene and perfluoropentacene on a KCl(100) substrate have been investigated by different (transmission) electron microscopy techniques.
References
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Journal ArticleDOI
Organic Electroluminescent Diodes
Ching Wan Tang,Steven A Vanslyke +1 more
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Very high-efficiency green organic light-emitting devices based on electrophosphorescence
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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.