Stable green phosphorescence organic light-emitting diodes with low efficiency roll-off using a novel bipolar thermally activated delayed fluorescence material as host

Guo, Kunping; Wang, Hedan; Wang, Zixing; Si, Changfeng; Peng, Cuiyun; Chen, Guo; Zhang, Jianhua; Wang, Gaofeng; Wei, Bin

doi:10.1039/c6sc03008d

Cited by 78 publications

(38 citation statements)

References 48 publications

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“…As observed in the Figure 7, OLEDs could maintain over 90% of the initial luminance during 30 min. This value is comparable to that reported for (mdppy) 2 Iracac as triplet emitter in a comparable device structure [25]. A half-life of about 300 min was also determined.…”

Section: Resultssupporting

confidence: 74%

Organic Light-Emitting Diodes Based on Phthalimide Derivatives: Improvement of the Electroluminescence Properties

2018

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Abstract:In this study, a phthalimide-based fluorescent material has been examined as a green emitter for multilayered organic light-emitting diodes (OLEDs). By optimizing the device stacking, a maximum brightness of 28,450 cd/m 2 at 11.0 V and a maximum external quantum efficiency of 3.11% could be obtained. Interestingly, OLEDs fabricated with Fluo-2 presented a 20-fold current efficiency improvement compared to the previous results reported in the literature, evidencing the crucial role of the device stacking in the electroluminescence (EL) performance of a selected emitter. Device lifetime was also examined and an operational stability comparable to that reported for a standard triplet emitter i.e., bis(4-methyl-2,5-diphenyl-pyridine)iridium(III) acetylacetonate [(mdppy) 2 Iracac] was evidenced.

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Section: Resultssupporting

confidence: 74%

Organic Light-Emitting Diodes Based on Phthalimide Derivatives: Improvement of the Electroluminescence Properties

2018

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“…The 11‐(3‐(4,6‐diphenyl‐1,3,5‐triazin‐2‐yl)phenyl)‐12,12‐dimethyl‐11,12‐dihydroindeno[2,1‐a]carbazole (DPDDC) is also a triazine derivative that works as the TADF host of a green phosphorescent emitter . It has a diphenyltriazine acceptor and an indenocarbazole donor for bipolar charge transport and TADF properties.…”

Section: Lifetime Improvement Of Oleds By Tadf Hostsmentioning

confidence: 99%

Recent Progress of the Lifetime of Organic Light‐Emitting Diodes Based on Thermally Activated Delayed Fluorescent Material

et al. 2019

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that satisfy the physical parameters of the OLEDs, and this could be assisted by the use of organic materials. Therefore, organic materials have played a key role in extending the lifetime of OLEDs. In particular, host materials and emitters in the emitting layer have been the major contributors to the improved lifetime of OLEDs, although charge transport materials such as hole and electron transport materials, exciton blocking materials, and carrier injection layers have also supported their extended lifetime. The advance in the lifetime of PhOLEDs has been dominantly assisted by the host materials, while that of TADF OLEDs has been mostly assisted by the emitters. Particularly, among several different types of host materials, the TADF-type hosts were the most effective hosts for long lifetime in the PhOLEDs. Therefore, TADF materials have played a decisive role in the development of highly efficient and long lifetime OLEDs.This progress report discusses the contribution of TADF materials toward the lifetime improvement of PhOLEDs as hosts and TADF OLEDs as emitters. The material design and device performances of the TADF materials are mainly examined based on recent studies that include the long lifetime PhOLEDs and TADF OLEDs assisted by TADF materials. The material designs of the intermolecular-type TADF hosts, the intramolecular-type TADF hosts, and the intramolecular-type TADF emitters for both high efficiency and long lifetime are widely covered in this report. Moreover, future possibilities of the TADF materials as hosts and emitters for long lifetime OLEDs are also proposed. The application of the TADF materials is summarized in Figure 1. Recently, the external quantum efficiency and lifetime of organic light-emitting diodes (OLEDs) have been dramatically upgraded due to development of organic materials and device structure. In particular, an intramolecular or intermolecular complex based on thermally activated delayed fluorescent (TADF) materials has greatly contributed to improving OLED device performance. Although high external quantum efficiency has been the main objective of the development of TADF materials as hosts and emitters, recent interest has been directed towards the lifetime of TADFmaterial-based OLEDs. For the past several years, remarkable advances in the lifetime of phosphorescent and TADF OLEDs have been made using TADF materials as hosts or emitters in the emitting layer. Therefore, since TADF materials are useful as both hosts and emitters for a long lifetime, this work discusses the recent progress made in developing TADF materials for long-lifetime OLEDs.

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“…[13][14][15][16][17][18][19] Bipolar hosts integrating hole-transporting and electron-transporting units into one molecule have been extensively studied for highly efficient PhOLEDs. [20][21][22][23] Recently, a potential approach is to use materials with thermally activated delayed uorescence (TADF) as a host for improve the efficiency of OLEDs, by the utilization of TADF molecules as host material for PHOLED to enable full singlet and triplet energy transfer to emitter as well as decrease the device efficiency roll-off by virtue of efficient upconversion from triplet to singlet. [24][25][26][27] Therefore, OLED performance can be dramatically improved by using a suitable host material and device structure.…”

Section: Introductionmentioning

confidence: 99%

Low energy consumption phosphorescent organic light-emitting diodes using phenyl anthracenone derivatives as the host featuring bipolar and thermally activated delayed fluorescence

Ling

Chen

et al. 2019

RSC Adv.

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Stable green phosphorescence organic light-emitting diodes with low efficiency roll-off using a novel bipolar thermally activated delayed fluorescence material as host

Abstract: A bipolar host with TADF properties is realized, endowing green PhOLEDs with a twentyfold lifetime improvement.

Cited by 78 publications

References 48 publications

Organic Light-Emitting Diodes Based on Phthalimide Derivatives: Improvement of the Electroluminescence Properties

Organic Light-Emitting Diodes Based on Phthalimide Derivatives: Improvement of the Electroluminescence Properties

Recent Progress of the Lifetime of Organic Light‐Emitting Diodes Based on Thermally Activated Delayed Fluorescent Material

Low energy consumption phosphorescent organic light-emitting diodes using phenyl anthracenone derivatives as the host featuring bipolar and thermally activated delayed fluorescence

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