High efficiency warm white phosphorescent organic light emitting devices based on blue light emission from a bipolar mixed-host

Chen, Chen; Liu, Yunfei; Chen, Zheng; Wang, Haoran; Wei, Meng-zhu; Bao, Cong; Zhang, Gang; Gao, Yonghui; Liu, Chunling; Jiang, Wenlong; Duan, Yu

doi:10.1016/j.orgel.2017.03.027

Cited by 19 publications

(8 citation statements)

References 20 publications

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“…Our team also reported high-efficient warm WOLEDs by employing donor mCP and acceptor B4PYMPM as exciplex host and blue phosphorescence FIrpic as the guest dopant and orange phosphorescence PO-01-TB as an ultrathin EML [138]. By optimizing the mixing ratio of mCP and B4PYMPM and the thickness of PO-01-TB, the WOLED shows PE max of 71.3 lm/W, the V on at 2.65 V, and stable color.…”

Section: Tadf Exciplexmentioning

confidence: 97%

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Recent advances in thermally activated delayed fluorescence for white OLEDs applications

Xue

Lin

Zhang

et al. 2020

J Mater Sci: Mater Electron

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Thermally activated delayed fluorescence (TADF) materials, which can harvest all excitons without utilizing any noble metals to emit light, are becoming the key cornerstone for developing the next generation of organic light-emitting diode (OLED) devices. In recent years, TADF materials are attracting numerous attentions as a new surge of research focuses on both science and industry owing to their high efficiency, low power consumption, and low production cost attributes when applied to white OLEDs. The design and application of TADF in WOLED devices have also experienced the rapid development in fundamental science and industrial technology perspectives. In the present review, the specific reverse intersystem crossing mechanism and evolution of TADF is outlined firstly, and then the latest research progress of TADF-WOLEDs is summarized and discussed. TADF/conventional fluorescence, TADF/phosphorescence, all TADF and TADF exciplex-based WOLEDs are categorized and elaborated in terms of the device structure, working mechanism, efficiency, color-rendering index, etc. Finally, we conclude with the future challenges and opportunities in high-quality TADF devices and application area.

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Section: Tadf Exciplexmentioning

confidence: 97%

“…Inter (Color figure online) Energy diagrams in this study, exhibiting better HOMO energy-level matching between TAPC and PO-01-TB promotes hole transport from TAPC to blue EML. Reproduced with permission from Ref [138],. 2017 Org.…”

mentioning

confidence: 99%

Recent advances in thermally activated delayed fluorescence for white OLEDs applications

Xue

Lin

Zhang

et al. 2020

J Mater Sci: Mater Electron

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show abstract

“…In addition, some mixed-hosts can form exciplex emission from intermolecular charge transfer of electron-transport and hole-transport type host materials. To insert complementary UEML into exciplex-based mixed-host layer is also applied to develop white OLEDs, and it is demonstrated that such device can realize more efficient utilization of excitons via exciplex energy transfer mechanism ( Wang et al., 2016 ; Chen et al., 2017 ; Ying et al., 2019 ). For example, in 2016, an efficient exciplex of mCP: B3PYMPM was applied as the host of blue FIrpic by Ma et al., and they successfully fabricated white OLEDs by simply inserting an orange UEML within the blue emissive zone with the structure of ITO/MoO 3 (10 nm)/TAPC: 10 wt%MoO 3 (50 nm)/TAPC(20 nm)/PO-01 (0.06 nm)/mCP:B3PYMPM:FIrpic 1:1:0.4, 10 nm)/B3PYMPM(15 nm)/B3PYMPM: 3 wt%Li 2 CO 3 (40 nm)/Li 2 CO 3 (1 nm)/Al.…”

Section: Oleds With Phosphorescent Uemls Inserted Into Blue Emittersmentioning

confidence: 99%

Recent progress on organic light-emitting diodes with phosphorescent ultrathin (<1nm) light-emitting layers

Miao

Yin

2022

iScience

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“…Those two mentioned parameters are functions of the electric field and depend on layer thickness [11]. Charge carrier mobility is estimated for individual materials using time-of-flight (TOF) and thin-film transistor (TFT) methods [12][13][14][15][16]. Several other attempts were also made to estimate charge carrier mobility under space charge limited current conditions or using frequency analysis of AC response of organic thin films between indium tin oxide (ITO) and metal as electrical contacts [17,18].…”

Section: Introductionmentioning

confidence: 99%

In-Situ Characterisation of Charge Transport in Organic Light-Emitting Diode by Impedance Spectroscopy

Chulkin

2021

Electronic Materials

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The article demonstrates an original, non-destructive technique that could be used to in situ monitor charge transport in organic light-emitting diodes. Impedance spectroscopy was successfully applied to determine an OLED’s charge carrier mobility and average charge density in the hole- and electron-transport layer in a range of applied voltages. The fabricated devices were composed of two commercially available materials: NPB (N,N′-di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine) and TPBi (2,2′,2″-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole)) as hole- and electron-transport layers, respectively. By varying the thicknesses of the hole-transport layer (HTL) and the electron-transport layer (ETL), correlations between layer thickness and both charge carrier mobility and charge density were observed. A possibility of using the revealed dependencies to predict diode current–voltage characteristics in a wide range of applied voltage has been demonstrated. The technique based on a detailed analysis of charge carrier mobilities and densities is useful for choosing the appropriate transport layer thicknesses based on an investigation of a reference set of samples. An important feature of the work is its impact on the development of fundamental research methods that involve AC frequency response analysis by providing essential methodology on data processing.

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High efficiency warm white phosphorescent organic light emitting devices based on blue light emission from a bipolar mixed-host

Cited by 19 publications

References 20 publications

Recent advances in thermally activated delayed fluorescence for white OLEDs applications

Recent advances in thermally activated delayed fluorescence for white OLEDs applications

Recent progress on organic light-emitting diodes with phosphorescent ultrathin (<1nm) light-emitting layers

In-Situ Characterisation of Charge Transport in Organic Light-Emitting Diode by Impedance Spectroscopy

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