Journal ArticleDOI
Development of high performance OLEDs for general lighting
Hisahiro Sasabe,Junji Kido +1 more
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
Citations
More filters
Journal ArticleDOI
Multi-function indoor light sources based on light-emitting diodes-a solution for healthy lighting.
TL;DR: The study suggests some fundamental principles for designing healthy light sources, and can be regarded as a guide for designing indoor light sources of the next generation.
Journal ArticleDOI
High-Efficiency Blue Phosphorescence Organic Light-Emitting Diode with Ambipolar Carbazole–Triazole Host
TL;DR: In this paper, an ambipolar material with a high triplet energy of 3.1 eV, 9-(4,5-diphenyl-4H-1,2,4-triazol-3-yl)phenyl)-9H-carbazole (CbzTAZ) was synthesized by conjugating an electron-transporting 1, 2, 4-triaxole and a hole-transport carbazole and employed as the host doping with blue emitter iridium(III)bis[4,6
Journal ArticleDOI
Multifunctional Bipolar Materials Serving as Emitters for Efficient Deep-Blue Fluorescent OLEDs and as Hosts for Phosphorescent and White OLEDs
Journal ArticleDOI
Interfacial triplet confinement for achieving efficient solution-processed deep-blue and white electrophosphorescent devices with underestimated poly(N-vinylcarbazole) as the host
Baohua Zhang,Lihui Liu,Guiping Tan,Guiping Tan,Bing Yao,Cheuk Lam Ho,Shumeng Wang,Junqiao Ding,Zhiyuan Xie,Wai Yeung Wong,Lixiang Wang +10 more
TL;DR: In this paper, a high triplet level interfacial layer is used to confine triplet excitons within the emissive layer, which can effectively cut off the potential loss pathways.
Journal ArticleDOI
Chitosan hydrogelation with a phenothiazine based aldehyde: a synthetic approach toward highly luminescent biomaterials
TL;DR: In this paper, pure organic luminescent hydrogels were synthesized using the condensation reaction of amino groups of chitosan with a photoactive aldehyde bearing a phenothiazine moiety.
References
More filters
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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.