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应用化学  2018, Vol. 35 Issue (8): 871-880    DOI: 10.11944/j.issn.1000-0518.2018.08.180154
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北京师范大学化学学院 北京 100875
Recent Development of Electroluminescent Diodes Based on Phosphorescent Materials
YUAN Ting,MENG Ting,LI Shuhua,FAN Louzhen()
Department of Chemistry,Beijing Normal University,Beijing 100875,China
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电致发光二极管(LEDs)具有能耗低、寿命长、绿色环保等优点,在固态照明、全色显示等领域具有广阔的应用前景。 与传统的荧光电致LEDs相比,磷光电致LEDs能够同时利用单重态和三重态激子,理论上可以使器件的内量子效率达到100%,突破5%的外量子效率极限。 因此,发展高效的磷光材料以及实现其在电致LEDs中的应用是非常有意义的。 本文综述了目前主要的磷光材料,包括有机金属配合物、纯有机分子、聚合物、金属有机框架材料和碳量子点等,并总结了稀有金属配合物和纯有机分子在电致磷光 LEDs中的研究进展,同时对电致磷光LEDs的发展前景进行展望。

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关键词 电致发光二极管磷光材料有机金属配合物金属有机框架碳量子点    

The development of electroluminescent light-emitting diodes(LEDs) has been received widespread attention for their potential applications in solid-state lighting technology, full-color displays due to their superior properties such as energy-saving, robust, long-lifetime and environment-friendly features. The notable advantage of electrophosphorescent LEDs is that they can simultaneously utilize both singlet and triplet exciton states which can reach to 100% internal quantum efficiency theoretically compared with those of conventional fluorescent LEDs. Therefore, it is highly desired to develop LEDs based on phosphorescent materials. In this review, we mainly discussed the latest researches on phosphorescent materials, including organometallic complexes, organic molecules, polymers, metal-organic frameworks and carbon quantum dots, etc., and focused on the applications of electrophosphorescent materials in LEDs. We hope this review will provide critical insights to inspire more exciting researches on environment-friendly phosphorescent materials for the application of electrophosphorescent LEDs in the near future.

Key wordselectrophosphorescent light-emitting diodes    phosphorescent materials    organometallic complexes    metal-organic frameworks    carbon quantum dots
收稿日期: 2018-05-04           接受日期: 2018-06-25
通讯作者: 范楼珍     E-mail:
袁廷,孟婷,李淑花,范楼珍. 基于磷光材料的电致发光二极管研究进展[J]. 应用化学, 2018, 35(8): 871-880.
YUAN Ting,MENG Ting,LI Shuhua,FAN Louzhen. Recent Development of Electroluminescent Diodes Based on Phosphorescent Materials. Chinese Journal of Applied Chemistry, 2018, 35(8): 871-880.
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Fig.1The structure and energy level diagrams of electroluminescent devices
Fig.2Photoluminescence(a) and electroluminescence(b) processes in phosphorescent materials
Fig.3Milestones in the development of phosphorescence materials
(1)Ma et al prepared electric phosphorescent luminescence device for the first time in 1998. (2)Polymer:Fraser and co-workers demonstrated phosphorescence polymer in 2007[4]. (3)Carbon dots: Zhao et al realized phosphorescence by dispersing carbon dots into poly(vinyl alcohol)(PVA) in 2013[7]. (4)Single-component organics:Huang et al reported H-aggregation induced phosphorescence in purely organic compounds in 2015[8]. (5)Organic host guest system:Adachi and co-workers reported Application of organic phosphorescence materials in OLEDs in 2015[10]. (6) MOFs:Yan and Yang achieved phosphorescence in MOFs in 2016[9]
Fig.4(1)Phosphorescence MOFs[23] of Zn-IPA(a), Zn-TPA-DMF(b), MOF-5(c), G4@ZIF-8(d), CP1(e), CP2(f). (2)Organic phosphorescence polymers[4]
图5(a)btp2Ir(acac)器件的外量子效率和流明效率与电流密度关系图[57]。(b)用Ir(Bu(ppy)3)制备器件的效率与电流密度关系图[18]。(c)Ir(PPy)3 掺杂TAZ中的器件器件能级图[57]。(d)可溶解的蓝色磷光材料结构式与其电致发光器件数据图[58]
Fig.5(a)External quantum efficiency and power efficiency of btp2Ir(acac)device vs current density[57]. (b)Efficiency of Ir(Bu(ppy)3)device vs current density[18]. (c)Energy diagrams of Ir(PPy)3 doped TAZ device[57]. (d)Structure of Ir complexs and electroluminescence device data[58]
Fig.6Application of organic phosphorescence materials in OLEDs[10]
(a)POLED structure with energy levels in eV. (b)Photographs of electroluminescence during(Voltage ON) and after(Voltage OFF) the electrical excitation of a device based on host of CzSte and guest of DMFLTPD. (c)Fluorescence(black) and phosphorescence(red) spectra of a DMFLTPD-doped(1% mass fraction) film in CzSte, and EL spectra of the POLED at different time during(blue) and after(green) electrical excitation. (d)Transient EL decay curve of the device after the applied voltage was turned off. (e)EQE-current density characteristics of the POLED
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