Optimized trade-off between electroluminescent stability and efficiency in solution-processed WOLEDs adopting functional iridium(III) complexes with 9-phenyl-9-phosphafluorene oxide (PhFlPO) moiety

Chen, Xi; Yang, Hua; Yao, Chaofan; Zhong, Daokun; Guo, Haoran; Yang, Xiaolong; Sun, Yi-Sui; Zhou, Guijiang; Wu, Zhaoxin

doi:10.1016/j.orgel.2020.105797

Cited by 7 publications

(3 citation statements)

References 37 publications

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“…For the PL process, there should be just an energy-transfer process without direct charge-trapping. If there was obvious energy transfer in the EL process, a great resemblance between EL and PL spectra would be observed . For the PL and EL spectra of the EML (mCP: 8% Ir(tpsp) 2 (bpp)), they were almost the same.…”

Section: Resultsmentioning

confidence: 93%

“…Other two evidence also supported this conclusion. For devices D1, D2, and D3, with the increase in the doped concentration, the current densities of these three devices almost had no change, indicating that the exciton-formation mechanism was not direct charge-trapping but was energy transfer . To further investigate the exciton-formation mechanism, we measured the PL spectra of the EML (mCP: 8% fac-Ir(tpsp) 2 (bpp)) and then compared with its EL spectra (Figure S12).…”

Section: Resultsmentioning

confidence: 99%

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Triphenylsilyl-Promoted Iridium Complex for High-Performance Green-Yellow Phosphorescent Organic Light-Emitting Diodes

Wei

Chen

et al. 2021

J. Phys. Chem. C

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In this work, a novel triphenylsilyl-based iridium complex, fac-Ir(tpsp)2(bpp), is developed. Triphenylsilyl groups endow fac-Ir(tpsp)2(bpp) with favorable intermolecular interactions. On the one hand, the steric hindrance of a triphenylsilyl group significantly weakens intermolecular π···π interactions. On the other hand, triphenylsilyl ligands provide several C–H···π interactions for fac-Ir(tpsp)2(bpp). As a result, fac-Ir(tpsp)2(bpp) exhibits a high sublimation yield (78.2%), high photoluminescence quantum yield (97.6%), short lifetime (510.9 ns), low concentration sensitivity (10–6 to 10–4 M), and moderate charge-transporting ability. Phosphorescent devices that utilize fac-Ir(tpsp)2(bpp) as the emitter display high efficiencies (100.9 cd/A, 105.6 lm/W, 27.9%), low roll-off of efficiencies (from 100 to 10,000 cd/m2: 5.3%), relatively low concentration sensitivity (from 5 to 12%), long device lifetime (61,892 h at 100 cd/m2), and very stable electroluminescent spectra (from 1 to 70,000 cd/m2). This performance is comparable to those of previous record green/yellow phosphorescent emitters. More importantly, most of record emitters report limited excellent parameters, and comprehensive emitter-like fac-Ir(tpsp)2(bpp) is rare. These results demonstrate that fac-Ir(tpsp)2(bpp) is a good phosphorescent emitter.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Triphenylsilyl-Promoted Iridium Complex for High-Performance Green-Yellow Phosphorescent Organic Light-Emitting Diodes

Wei

Chen

et al. 2021

J. Phys. Chem. C

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“…In addition to the consideration of dominant blue, to attain reliable white emission, it is also important to make one of two emission mechanisms dominant or to suppress the CT because it is known that these issues affect the color shift according to the driving voltage. [40,41] To this end, it was necessary to understand that the emission mechanism in WOLEDs with single EMLs is mostly determined by red dopants with low energy states, which act as electron traps, resulting in the CT. [38] In our case as well, the characteristic of the red dopant was verified by the fact that the red device using the red dopant showed changes in the current density-voltage (J-V) curve depending on the applied voltages, as shown in Figure 2f (Figure S5, Supporting Information). Therefore, it was reasonably expected that our WOLED using the red dopant would have the emission of the CT induced by the red dopant.…”

Section: Discussion and Resultsmentioning

confidence: 99%

High‐Performance and Reliable White Organic Light‐Emitting Fibers for Truly Wearable Textile Displays

et al. 2022

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Light‐emitting fibers have been intensively developed for the realization of textile displays and various lighting applications, as promising free‐form electronics with outstanding interconnectivity. These advances in the fiber displays have been made possible by the successful implementation of the core technologies of conventional displays, including high optoelectronic performance and essential elements, in the fiber form‐factor. However, although white organic light‐emitting diodes (WOLEDs), as a fundamental core technology of displays, are essential for realizing full‐color displays and solid‐state lighting, fiber‐based WOLEDs are still challenging due to structural issues and the lack of approaches to implementing WOLEDs on fiber. Herein, the first fiber WOLED is reported, exhibiting high optoelectronic performance and a reliable color index, comparable to those of conventional planar WOLEDs. As key features, it is found that WOLEDs can be successfully introduced on a cylindrical fiber using a dip‐coatable single white‐emission layer based on simulation and optimization of the white spectra. Furthermore, to ensure durability from usage, the fiber WOLED is encapsulated by an Al2O3/elastomer bilayer, showing stable operation under repetitive bending and pressure, and in water. This pioneering work is believed to provide building blocks for realizing complete textile display technologies by complementing the lack of the core technology.

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Resonance hosts for high efficiency solution-processed blue and white electrophosphorescent devices

Jin

Yuan

et al. 2020

Sci. China Chem.

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Optimized trade-off between electroluminescent stability and efficiency in solution-processed WOLEDs adopting functional iridium(III) complexes with 9-phenyl-9-phosphafluorene oxide (PhFlPO) moiety

Cited by 7 publications

References 37 publications

Triphenylsilyl-Promoted Iridium Complex for High-Performance Green-Yellow Phosphorescent Organic Light-Emitting Diodes

Triphenylsilyl-Promoted Iridium Complex for High-Performance Green-Yellow Phosphorescent Organic Light-Emitting Diodes

High‐Performance and Reliable White Organic Light‐Emitting Fibers for Truly Wearable Textile Displays

Resonance hosts for high efficiency solution-processed blue and white electrophosphorescent devices

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