Journal ArticleDOI
Yellow/orange emissive heavy-metal complexes as phosphors in monochromatic and white organic light-emitting devices
Cong Fan,Chuluo Yang +1 more
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TLDR
This article will review the progress on yellow/orange heavy-metal complexes as phosphors in OLEDs, and the structure-property relationship and electrophosphorescence performance of the yellow/ orange heavy- metal complexes in monochromatic phosphorescent OLEDs and white OLEDs will be comprehensively surveyed and discussed.Abstract:
Owing to the electron spin-orbit coupling (SOC) and fast intersystem crossing (ISC), heavy-metal complexes (such as iridium(III), platinum(II) and osmium(II) complexes, etc.) are phosphorescent emitters at room temperature. Since 1998, heavy-metal complexes as phosphors have received considerable academic and industrial attention in the field of organic light-emitting diodes (OLEDs), because they can harvest both the singlet (25%) and triplet (75%) excitons for emission during the electro-generated processes. Among all the visible colors (blue, green, yellow, orange and red), the yellow/orange heavy-metal complexes play an important role for realizing full-color OLEDs as well as high-efficiency white OLEDs, and thus the development of highly efficient yellow/orange heavy-metal complexes is a pressing concern. In this article, we will review the progress on yellow/orange heavy-metal complexes as phosphors in OLEDs. The general principles and useful tactics for designing the yellow/orange heavy-metal complexes will be systematically summarized. The structure-property relationship and electrophosphorescence performance of the yellow/orange heavy-metal complexes in monochromatic phosphorescent OLEDs (PhOLEDs) and white OLEDs (WOLEDs) will be comprehensively surveyed and discussed.read more
Citations
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Journal ArticleDOI
Functionalization of phosphorescent emitters and their host materials by main-group elements for phosphorescent organic light-emitting devices.
TL;DR: The main emphasis lies on the important role played by the main-group element groups in addressing the key issues of both phosphorescent emitters and their host materials to fulfill high-performance phosphorescent OLEDs.
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
Achieving Nearly 30% External Quantum Efficiency for Orange–Red Organic Light Emitting Diodes by Employing Thermally Activated Delayed Fluorescence Emitters Composed of 1,8-Naphthalimide-Acridine Hybrids
Weixuan Zeng,Hsin-Yu Lai,Wei-Kai Lee,Min Jiao,Yi-Jiun Shiu,Cheng Zhong,Shaolong Gong,Tao Zhou,Guohua Xie,Monima Sarma,Ken-Tsung Wong,Chung-Chih Wu,Chuluo Yang +12 more
TL;DR: This finding relaxes the usually stringent material requirements for effective TADF emitters by comprising smaller radiative transition rates and less than ideal ΦPL s.
Journal ArticleDOI
A versatile thermally activated delayed fluorescence emitter for both highly efficient doped and non-doped organic light emitting devices
Wei-Lung Tsai,Ming-Hao Huang,Wei-Kai Lee,Yi-Jiun Hsu,Kuan-Chung Pan,Yi Hsiang Huang,Hao-Chun Ting,Monima Sarma,Yu-Yi Ho,Hu Hung-Chieh,Chung-Chia Chen,Meng-Ting Lee,Ken-Tsung Wong,Chung-Chih Wu +13 more
TL;DR: A thermally activated delayed fluorescent emitter (DMAC-TRZ) was reported either as the emitting dopant in a host or as the non-doped (neat) emitting layer to achieve high EL EQEs of up to 26.5% and 20% in OLEDs, respectively.
Journal ArticleDOI
Bis-Tridentate Ir(III) Complexes with Nearly Unitary RGB Phosphorescence and Organic Light-Emitting Diodes with External Quantum Efficiency Exceeding 31%.
Chu-Yun Kuei,Wei-Lung Tsai,Bihai Tong,Bihai Tong,Min Jiao,Wei-Kai Lee,Yun Chi,Chung-Chih Wu,Shih-Hung Liu,Gene-Hsiang Lee,Pi-Tai Chou +10 more
TL;DR: A new class of neutral bis-tridentate Ir(III) metal complexes that show nearly unitary red, green, and blue emissions in solution is prepared and employed for the fabrication of both monochrome and white-emitting organic light-emitted diodes.
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