Tetracoordinate Boron‐Based Multifunctional Chiral Thermally Activated Delayed Fluorescence Emitters

Zhou, Ling; Ni, Fan; Li, Nan; Wang, Kai; Xie, Guohua; Yang, Chuluo

doi:10.1002/ange.202203844

Cited by 13 publications

(2 citation statements)

References 35 publications

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“…Finally, various patterned F-PeLEDs were fabricated according to the device structure of the PET/X-PEDOT:PSS anode/hole-transporting layer (HTL)/CsPbBr 3 perovskite light-emitting layer/2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1- H -benzimidazole) (TPBi)/LiF/Al. Here, the HTL was fabricated to facilitate the hole carrier injection from the PEDOT:PSS electrode to the perovskite layer . Because of the water resistance ability of X-PEDOT:PSS electrodes as mentioned above, the spin-coating process of HTL will not destroy the underlayer electrodes.…”

Section: Resultsmentioning

confidence: 99%

Photopatternable and Highly Conductive PEDOT:PSS Electrodes for Flexible Perovskite Light-Emitting Diodes

Liu

Yang

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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Flexible perovskite light-emitting diodes (PeLEDs) constitute an emerging technology opening new opportunities in the fields of lighting and display for portable and wearable electronics. Poly(3,4-ethylenedioxythiophene):poly-(stryrenesulfonate) (PEDOT:PSS) as one of the most promising flexible electrode materials has attracted extensive attention. However, the patterning and conductivity issues of PEDOT:PSS electrodes should be addressed primarily. Here, a photopolymerizable additive is proposed to endow the PEDOT:PSS electrodes with photopatternability. Moreover, this additive can also improve the conductivity of the PEDOT:PSS electrode from 0.16 to 627 S/cm because of the phase separation between PEDOT and PSS components and conformation transition of PEDOT chains. Eventually, highly conductive PEDOT:PSS electrodes with various patterns are applied in flexible PeLEDs, demonstrating a high luminance of 25972 cd/m 2 and a current efficiency of 25.1 cd/A. This work provides a facile and effective method of patterning and improving the conductivity of PEDOT:PSS electrodes simultaneously, demonstrating the great potential of PEDOT:PSS electrodes in flexible perovskite optoelectronics.

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Section: Resultsmentioning

confidence: 99%

Photopatternable and Highly Conductive PEDOT:PSS Electrodes for Flexible Perovskite Light-Emitting Diodes

Liu

Yang

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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“…Recently, purely organic CPL materials with TADF feature are reported as good candidates for realizing efficient CP-EL because of their full exciton utilization based on reverse intersystem crossing (RISC) process [35][36][37] . But due to strong intramolecular charge transfer (ICT) effect, the reported CP-TADF materials only show emission peaks in the range of 453-716 nm [38][39][40][41] , and those with emission peaks shorter than 450 nm are rarely achieved. In this work, the one-to-many strategy for attaining CP-EL is proposed by employing a series of new efficient near ultraviolet CPL materials to sensitize various achiral luminescent materials (Fig.…”

Section: Introductionmentioning

confidence: 99%

Efficient circularly polarized electroluminescence from achiral luminescent materials

Líu

Peng

et al. 2022

Preprint

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Circularly polarized electroluminescence (CP-EL) with a defined color is generally produced in organic light-emitting diodes (OLEDs) based on CP luminescent (CPL) materials with similar colors. Such kind of many-to-many relationship requires numerous new CPL materials to fabricate CP-OLEDs because the well-developed achiral luminescent materials are rarely considered to be capable of directly producing CP-EL. Herein, the one-to-many strategy is proposed for CP-EL by employing high-performance near ultraviolet CPL materials to sensitize achiral luminescent materials. These newly developed near ultraviolet CPL materials have excellent photoluminescence (PL) quantum yields and good CPL dissymmetry factors, and can induce efficient blue to red CP-PL for achiral fluorescence, phosphorescence, thermally activated delayed fluorescence (TADF) and multi-resonance (MR) TADF materials. Efficient near ultraviolet CP-EL with the best external quantum efficiencies (ηexts) of 9.0% at 404 nm and extremely small efficiency roll-offs are achieved by using them as emitters for CP-OLEDs. By adopting them as hosts or sensitizers, commercially available yellow-orange achiral phosphorescence, TADF and MR-TADF materials can generate strong CP-EL, with absolute dissymmetry factors and outstanding ηexts of up to 2.87 × 10−3 and 30.8%, respectively, which are the state-of-the-art CP-EL performances reported so far, demonstrating a simple and universal avenue towards efficient CP-EL.

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Highly Efficient Sky‐Blue π‐Stacked Thermally Activated Delayed Fluorescence Emitter with Multi‐Stimulus Response Properties

Shen

Feng

et al. 2022

Angewandte Chemie

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Organic materials with multi‐stimulus response (MSR) properties have demonstrated many potential and practical applications. Herein, a π‐stacked thermally activated delayed fluorescence (TADF) material with multi‐stimulus response (MSR) properties, named SDMAC, was designed and synthesized using distorted 9,9‐dimethyl‐10‐phenyl‐9,10‐dihydroacridine as a donor. SDMAC possesses a rigid π‐stacked configuration with intramolecular through‐space interactions and exhibits aggregation‐induced emission enhancement (AIEE), solvatochromic, piezochromic, and circularly polarized luminescence (CPL) under different external stimuli. The rigid molecular structure and efficient TADF properties of SDMAC can be used in displays and lighting. Using SDMAC as an emitter, the maximum external quantum efficiency (EQE) of the fabricated organic light‐emitting diodes (OLEDs) is as high as 28.4 %, which make them the most efficient CP‐TADF OLEDs based on the through‐space charge transfer strategy. The CP organic light‐emitting diodes (CP‐OLEDs) exhibit circularly polarized electroluminescence (CPEL) signals.

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Tetracoordinate Boron‐Based Multifunctional Chiral Thermally Activated Delayed Fluorescence Emitters

Cited by 13 publications

References 35 publications

Photopatternable and Highly Conductive PEDOT:PSS Electrodes for Flexible Perovskite Light-Emitting Diodes

Photopatternable and Highly Conductive PEDOT:PSS Electrodes for Flexible Perovskite Light-Emitting Diodes

Efficient circularly polarized electroluminescence from achiral luminescent materials

Highly Efficient Sky‐Blue π‐Stacked Thermally Activated Delayed Fluorescence Emitter with Multi‐Stimulus Response Properties

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