Synthesis and optoelectronic properties of novel fluorene-bridged dinuclear cyclometalated iridium (III) complex with A–D–A framework in the single-emissive-layer WOLEDs

He, Keqi; Wang, Xiangdong; Yu, Junting; Jiang, Haigang; Xie, Guangshan; Tan, Hua; Liu, Yu; Ma, Dongge; Zhu, Weiguo

doi:10.1016/j.orgel.2014.08.014

Cited by 21 publications

(5 citation statements)

References 45 publications

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“…By using single fluorene‐bridged dinuclear Ir(III) complexes ( 136 , Scheme ) as emitter, the device with the structure of ITO/PEDOT:PSS/10 wt% 136 :TcTa/TPBi/LiF/Al exhibits maximal brightness of 1040 cd m −2 and CE max of 1.2 cd A −1 . Meanwhile, the CIE coordinates varies from (0.36, 0.48) to (0.27, 0.35) under the driving voltages from 6.6 to 9.6 V, which confirms good color stability of these WPLEDs . The WOLED fabricated by using a single Ir(III) complex with the structure of ITO/PEDOT:PSS/40% 99 :TcTa/TPBi/Ba/Ag affords the brightness of ≈1000 cd m −2 and CE of 1 cd A −1 at 9 V with CIE coordinates of (0.281, 0.360) .…”

Section: White Electroluminescence Devicesmentioning

confidence: 70%

Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

et al. 2020

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White organic light‐emitting diodes (WOLEDs) are superior to traditional incandescent light bulbs and compact fluorescent lamps in terms of their merits in ensuring pure white‐light emission, low‐energy consumption, large‐area thin‐film fabrication, etc. Unfortunately, WOLEDs based on multilayered or multicomponent (red, green, and blue (RGB)) emissive layers can suffer from some remarkable disadvantages, such as intricate device fabrication and voltage‐dependent emission color, etc. Single molecules, which can emit white light, can be used to replace multiple emitters, leading to a simplified fabrication process, stable and reproducible WOLEDs. Recently, the performance of WOLEDs by using single molecules is catching up with that of the state‐of‐the‐art devices fabricated by multicomponent emitters. Therefore, an increasing attention has been paid on single white‐light‐emitting materials for efficient WOLEDs. In this review, different mechanisms of white‐light emission from a single molecule and the performance of single‐molecule‐based WOLEDs are collected and expounded, hoping to light up the interesting subject on single‐molecule white‐light‐emitting materials, which have great potential as white‐light emitters for illumination and lighting applications in the world.

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Section: White Electroluminescence Devicesmentioning

confidence: 70%

Single‐Molecular White‐Light Emitters and Their Potential WOLED Applications

et al. 2020

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“…The resulting iridium(III) complexes show high Φ P and an unexpectedly large red-shift effect in the phosphorescent wavelength compared to that of the corresponding mononuclear congener. Furthermore, a simple solution-processed orange-red-emitting OLED using the dinuclear iridium(III) complex as the emitter shows η ext , η L , and η P of 14.4%, 27.2 cd A –1 , and 19.5 lm W –1 , respectively, which are not only among the highest efficiencies achieved by dinuclear iridium(III) complex-based OLEDs ,− but also among the highest efficiencies obtained by solution-processed orange-red-emitting OLEDs. − …”

Section: Introductionmentioning

confidence: 99%

From Mononuclear to Dinuclear Iridium(III) Complex: Effective Tuning of the Optoelectronic Characteristics for Organic Light-Emitting Diodes

et al. 2016

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Phosphorescent dinuclear iridium(III) complexes that can show high luminescent efficiencies and good electroluminescent abilities are very rare. In this paper, highly phosphorescent 2-phenylpyrimidine-based dinuclear iridium(III) complexes have been synthesized and fully characterized. Significant differences of the photophysical and electrochemical properties between the mono- and dinuclear complexes are observed. The theoretical calculation results show that the dinuclear complexes adopt a unique molecular orbital spatial distribution pattern, which plays the key role of determining their photophysical and electrochemical properties. More importantly, the solution-processed organic light-emitting diode (OLED) based on the new dinuclear iridium(III) complex achieves a peak external quantum efficiency (η(ext)) of 14.4%, which is the highest η(ext) for OLEDs using dinuclear iridium(III) complexes as emitters. Besides, the efficiencies of the OLED based on the dinuclear iridium(III) complex are much higher that those of the OLED based on the corresponding mononuclear iridium(III) complex.

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“…13 Fluorene derivatives have been widely used as OLED materials in the past years. [14][15][16][17][18][19][20][21][22][23][24][25] However, long wavelength emission, derived from excimer emission and/or the oxidation of the 9-position on the fluorene ring, is a great disadvantage for these kinds of materials when they are used as blue emission materials in OLEDs. 26,27 To overcome the disadvantages, silafluorene derivatives have been investigated to replace the corresponding fluorene derivatives and have exhibited some promising properties.…”

Section: Introductionmentioning

confidence: 99%