Journal ArticleDOI
Mixed host organic light-emitting devices with low driving voltage and long lifetime
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TLDR
In this paper, the authors presented and analyzed the performance of the mixed host organic light-emitting devices (OLEDs) with a high mobility electron ETL material, bis(10-hydroxybenzo[h]qinolinato)beryllium, and showed a brightness of 27600cd∕m2 at a driving voltage of 5 V.Abstract:
In this letter, we present and analyze the device performance of the mixed host (MH) organic light-emitting devices (OLEDs). The host of the emitting layer (EML) material in this device consists of a hole transport layer (HTL) and an electron transport layer (ETL) fabricated by coevaporation. The bipolar transport characteristic of the MH layer helps to reduce the driving voltage. Device lifetime is increased due to the elimination of the sharp boundary of the HTL/EML interface. Combining the MH structure with a high mobility electron ETL material, bis(10-hydroxybenzo[h]qinolinato)beryllium, the OLED has shown a brightness of 27600cd∕m2 at a driving voltage of 5 V, and a lifetime four times longer than that of a conventional OLED.read more
Citations
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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
Degradation Mechanisms and Reactions in Organic Light-Emitting Devices.
Journal ArticleDOI
Al2O3/ZrO2 Nanolaminates as Ultrahigh Gas-Diffusion Barriers—A Strategy for Reliable Encapsulation of Organic Electronics
Jens Meyer,Patrick Görrn,Franz Bertram,Sami Hamwi,Thomas Winkler,Hans-Hermann Johannes,Thomas Weimann,Peter Hinze,Thomas Riedl,Wolfgang Kowalsky +9 more
TL;DR: In this article, the authors report on thin encapsulation layers prepared by ALD at a temperature of 80 8C, and introduce novel highly efficient permeation barriers based on so-called nanolaminate structures.
Journal ArticleDOI
Long-lived efficient delayed fluorescence organic light-emitting diodes using n-type hosts
Lin-Song Cui,Shi Bin Ruan,Fatima Bencheikh,Ryo Nagata,Lei Zhang,Ko Inada,Hajime Nakanotani,Hajime Nakanotani,Liang-Sheng Liao,Chihaya Adachi,Chihaya Adachi +10 more
TL;DR: It is demonstrated that electron-transporting n-type hosts, which typically include an acceptor moiety in their chemical structure, have the intrinsic ability to balance the charge fluxes and broaden the recombination zone in delayed fluorescence organic electroluminescent devices, while at the same time preventing the formation of high-energy excitons.
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Hydroxynaphthyridine-derived group III metal chelates: wide band gap and deep blue analogues of green Alq3 (tris(8-hydroxyquinolate)aluminum) and their versatile applications for organic light-emitting diodes.
Szu-Hung Liao,Jin-Ruei Shiu,Shun-Wei Liu,Shi-Jay Yeh,Yu-Hung Chen,Chin-Ti Chen,Tahsin J. Chow,Chih-I Wu +7 more
TL;DR: It is successfully demonstrated that the application of these unusual hydroxynaphthyridine metal chelates can be very versatile and effective and solved or alleviated the problem of exciplex formation that took place between the hole-transporting layer and hydroxynthetic metalChelates, of which OLED application has been prohibited to date.
References
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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.
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Electroluminescence of doped organic thin films
TL;DR: In this paper, a multilayer-doped EL was constructed using a hole-transport layer and a luminescent layer, and the electron-hole recombination and emission zones can be confined to about 50 A near the hole.
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Organic electroluminescent devices with improved stability
TL;DR: In this article, a stable organic electroluminescent devices based on vapor-deposited Alq thin films have been achieved, which are derived from several factors including: (1) a multilayer thin-film structure with a CuPc stabilized hole-injection contact, (2) a hole-transport diamine layer using a naphthyl substituted benzidine derivative, and (3) an ac drive wave form.
Journal ArticleDOI
Device physics of organic light-emitting diodes based on molecular materials
TL;DR: In this article, the authors investigated the properties of single and hetero-layer organic light-emitting diodes based on aromatic amines and showed that the thickness dependence of the currentvoltage (I-V) characteristics provides a unique criterion to discriminate between (1) injection limited behaviour, (2) trap-charge limited conduction with an exponential trap distribution and a fieldindependent mobility, and (3) trap free space-charge-limited conduction (SCLC) with a field and temperature dependent mobility.
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Nonradiative recombination centers and electrical aging of organic light-emitting diodes: Direct connection between accumulation of trapped charge and luminance loss
TL;DR: In this paper, the authors find that the decreasing luminance efficiency is linearly correlated with an accumulation of immobile positive charge at the HTL|ETL interface, and the magnitude of the charge is comparable to the total charge at that interface when an unaged device is operated.