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
Perovskite solar cells employing organic charge-transport layers
Olga Malinkiewicz,Aswani Yella,Yong Hui Lee,Guillermo Mínguez Espallargas,Michael Graetzel,Mohammad Khaja Nazeeruddin,Henk J. Bolink +6 more
TL;DR: In this article, a perovskite solar cell was fabricated by using room-temperature deposition processes and the cells were based on a layer of methylammonium lead iodide perovsite that is prepared by sublimation in a high-vacuum chamber and sandwiched between two thin organic charge-transport layers.
Journal ArticleDOI
Anthraquinone-Based Intramolecular Charge-Transfer Compounds: Computational Molecular Design, Thermally Activated Delayed Fluorescence, and Highly Efficient Red Electroluminescence
Qisheng Zhang,H. Kuwabara,William J. Potscavage,Shuping Huang,Yasuhiro Hatae,Takumi Shibata,Chihaya Adachi +6 more
TL;DR: It is demonstrated that increasing the distance between donor (D) and acceptor (A) in intramolecular-charge-transfer molecules is a promising strategy for simultaneously achieving small ΔE(ST) and large k(F), which is in good agreement with those predicted by corrected time-dependent density functional theory.
Journal ArticleDOI
Approaches for fabricating high efficiency organic light emitting diodes
TL;DR: In this article, the efficiency records of OLED devices using fluorescent, phosphorescent, and thermally activated delay fluorescent materials are summarized and a review of all the available efficiency-effective device architectural approaches, which include using thin layer structures, low carrier injection barriers, high carrier mobility, balanced carrier injection, effective carrier confinement, effective host-to-guest energy transfer, effective recombination zone, effective exciton generation on the host and p-i-n structures, and tandem structures.
Journal ArticleDOI
White Polymer Light-Emitting Devices for Solid-State Lighting: Materials, Devices, and Recent Progress
TL;DR: The recent advances in WPLEDs are summarized with special attention paid to the design of novel luminescent dopants and device structures that minimize the gap from other lighting sources such as fluorescent lamps, light-emitting diodes based on inorganic semiconductors, and vacuum-deposited small-molecular devices, thus rendering WPL EDs equally competitive.
Patent
Organic Electroluminescent Materials and Devices
Chuanjun Xia,Chun Lin +1 more
TL;DR: In this paper, novel tricarbazole compounds with appropriate HOMO and LUMO energies can be obtained for use as materials in a secondary hole transport layer, by appropriately selecting the nature of the tricarazole substituents.
References
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Proceedings ArticleDOI
Realizing white phosphorescent 100 lm/W OLED efficacy
Brian D'Andrade,James Esler,Chun Lin,Vadim Adamovich,Sean Xia,Michael S. Weaver,Raymond Kwong,Julie J. Brown +7 more
TL;DR: In this paper, a new structure was developed that had the following characteristics that were measured using a spot meter: at 100 cd/m 2 normal luminance, EQE = 20%, power efficacy is 34 lm/W, operating voltage = 3.6 V, CIE = (0.44, 0.44) and CRI = 75.
Journal ArticleDOI
Molecular hosts for triplet emitters in organic light-emitting diodes and the corresponding working principle
TL;DR: In this article, the authors summarized the mechanism and routes for excitation of triplet emitters in dopant emission based phosphorescent organic light-emitting diodes (PhOLEDs).
Journal ArticleDOI
45.2: Invited Paper: Extremely High Performance White OLEDs for Lighting
TL;DR: In this article, the performance of single unit and two unit structures on a light outcoupling substrate was investigated and the single unit device showed high efficacy of 87 lm/W with a half decay lifetime of 10,000 h at the luminance of 1,000 cd/m2.
Journal ArticleDOI
Blue light-emitting device based on a unidentate organometallic complex containing lithium as an emission layer
Journal ArticleDOI
A hydroxyphenyloxadiazole lithium complex as a highly efficient blue emitter and interface material in organic light-emitting diodes
TL;DR: In this paper, a hydroxyphenyloxadiazole lithium complex (LiOXD) was synthesized as a blue light-emitting and electron injection/transport material to be used in double-layer organic electroluminescent devices.