Zhuang Cheng

Jilin University

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Futong Liu

Jilin University

Ping Lü

Jilin University

Zijun Feng

Jilin University

Liang Wan

Central South University

Yangze Xu

Jilin University

Chunya Du

State Key Laboratory of Supramolecular Structure and Materials

Xiaobo Ma

Jilin University

Yin Hu

Wenzhou Institute of Technology Testing & Calibration

Zihan Su

Shaanxi University of Science and Technology

Yulei Chang

Chinese Academy of Sciences

Cooperative Institutions

Jilin University

State Key Laboratory of Supramolecular Structure and Materials

Chinese Academy of Sciences

Jilin Medical University

South China University of Technology

Hubei University of Technology

Huazhong University of Science and Technology

State Key Laboratory of Luminescent Materials and Devices

Sichuan University

University of Chinese Academy of Sciences

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CCDC 2266221: Experimental Crystal Structure Determination

The Cambridge Structural Database (2023)

Futong Liu Gongyi Cao Zijun Feng Zhuang Cheng Yan Yan

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc2g25xn

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Highly Efficient Asymmetric Multiple Resonance Thermally Activated Delayed Fluorescence Emitter with EQE of 32.8 % and Extremely Low Efficiency Roll‐Off

Angewandte Chemie International Edition (2022)

Futong Liu Zhuang Cheng Yixuan Jiang Lei Gao Hanxuan Liu

Multiple resonance thermally activated delayed fluorescence (MR-TADF) emitters show great potentials for high color purity organic light-emitting diodes (OLEDs). However, the simultaneous realization of high photoluminescence quantum yield (PLQY) and high reverse intersystem crossing rate (kRISC ) is still a formidable challenge. Herein, a novel asymmetric MR-TADF emitter (2Cz-PTZ-BN) is designed that fully inherits the high PLQY and large kRISC values of the properly selected parent molecules. The resonating extended π-skeleton with peripheral protection can achieve a high PLQY of 96 % and a fast kRISC of above 1.0×105 s-1 , and boost the performance of corresponding pure green devices with an outstanding external quantum efficiency (EQE) of up to 32.8 % without utilizing any sensitizing hosts. Remarkably, the device sufficiently maintains a high EQE exceeding 23 % at a high luminance of 1000 cd m-2 , representing the highest value for reported green MR-TADF materials at the same luminescence.

Intersystem crossing

Quantum Efficiency

Quantum yield

10.1002/anie.202116927

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Precise Regulation of the Reverse Intersystem Crossing Pathway by Hybridized Long‐Short Axis Strategy for High‐Performance Multi‐Resonance TADF Emitters

Angewandte Chemie (2024)

Futong Liu Zhuang Cheng Wei Dong Yan Yan Yangze Xu

Abstract Multi‐resonance thermally activated delayed fluorescence (MR‐TADF) molecules have experienced great success in organic light‐emitting diodes (OLEDs) owing to their outstanding quantum efficiencies and narrow full width at half‐maximums (FWHMs). However, the reverse intersystem crossing (RISC) rates of MR‐TADF emitters are usually small, which will lead to relatively long triplet exciton lifetime and severe efficiency roll‐off. Here, we report an effective molecular design strategy to introduce multichannel RISC pathways and thus increase RISC rates without compromising the color fidelity and emission efficiency by the “hybridized long‐short axis (HLSA)” strategy. The TPA‐CN‐BN shows a near‐unity photoluminescence quantum yield, rapid RISC rate of 1.4×10 5 s −1 , narrow FWHM of 23 nm, and small singlet‐triplet energy gap (Δ E ST ) of 0.06 eV in solution. The non‐sensitized OLED based on TPA‐CN‐BN exhibits a narrowband emission with the FWHM of 31 nm, in company with external quantum efficiency (EQE) of 37.9 %. Notably, the device exhibits the low efficiency roll‐off as the EQEs maintain 34.8 % and 21.8 % at 100 and 1000 cd m −2 , respectively, representing the best performance for single‐host OLEDs based on the BCzBN skeleton. This study provides a fresh and promising approach to realize high‐performance OLEDs with high color purity and remarkable device efficiency.

Intersystem crossing

10.1002/ange.202416154

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High‐Efficiency Hybrid White Organic Light‐Emitting Diodes with Extremely Low Efficiency Roll‐Off and Superior Color Stability Enabled by an Emitting System with Imidazole‐Biphenyl Derivatives

Advanced Optical Materials (2024)

Hui Liu Futong Liu Zhuang Cheng Yan Yan Liang Wan

Abstract Hybride white organic light‐emitting diodes (WOLEDs) have experienced great success as a prospective technology for the new generation lighting source. Nevertheless, WOLEDs exhibiting excellent effciency and good color stability at high operation brightness are still rare. Herein, a simple but efficient blue molecule, pyrenoimidazole‐biphenyl (PPyIM), which exhibits promising external quantum efficiency (EQE) of 7.6% and 7.2% at the luminescence of 1000 − and 5000 cd m −2 in nondoped blue OLED, is first developed. And then, phenanthroimidazole‐biphenyl (PPIM) with analogous molecular skeleton of PPyIM is chosen as the host of phosphorescent dye PO‐01, and the resulting doped device achieves excellent EQE of 26.5% at the high luminescence of 5000 cd m −2 . Furthermore, adopting PPyIM as nondoped blue emissive layer, the two‐color hybrid WOLED exhibites stable warm white emission with CIE coordinates of (0.454, 0.439), color rendering index (CRI) of 45, and correlated color temperature (CCT) of 2996 K. The maximum EQE reaches 23.5%, and the EQE still maintains 21.2% even at the luminance of 5000 cd m −2 . Notably, this device exhibits exceptionally stable warm white emission, the CIE coordinates variation is only (0.004, 0.003) in the wide luminance range from 400 to 10000 cd m −2 , representing the best outcome for hybrid WOLEDs to date.

Biphenyl

Imidazole

10.1002/adom.202401424

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Two different implementation strategies for highly efficient non-doped fluorescent organic light-emitting diodes based on benzothiadiazole derivatives

Chemical Engineering Journal (2022)

Chunya Du Zhuang Cheng Anqi Shang Yangze Xu An Zhao

Quantum Efficiency

Intersystem crossing

Triphenylamine

Quantum yield

10.1016/j.cej.2022.135010

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Citations (14)

Achieving Highly Efficient Non-Doped Hot Exciton Blue Emitters by Confining the Conjugation Length and Adjusting the Charge Transfer Strength

Shuyuan Ge Chunya Du Zhuang Cheng Yaxue Wang Zijun Feng

Download This Paper Open PDF in Browser Add Paper to My Library Share: Permalink Using these links will ensure access to this page indefinitely Copy URL Copy DOI

10.2139/ssrn.4725671

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CCDC 2092964: Experimental Crystal Structure Determination

The Cambridge Structural Database (2023)

Futong Liu Zhuang Cheng Liang Wan Zijun Feng Hui Liu

10.5517/ccdc.csd.cc287wzd

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Recent progress of sulphur-containing high-efficiency organic light-emitting diodes (OLEDs)

Journal of Materials Chemistry C (2021)

Zijun Feng Zhuang Cheng Haixu Jin Ping Lü

Recent progress of efficient OLEDs based on sulphur-containing heterocyclic compounds, thiophene, phenylsulfone, thiazole and phenothiazine, as appealing building blocks for the new generation of luminogens, is systematically summarized.

Thiazole

10.1039/d1tc05255a

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Triphenylene-Based Emitters with Hybridized Local and Charge-Transfer Characteristics for Efficient Nondoped Blue OLEDs with a Narrowband Emission and a Small Efficiency Roll-Off

ACS Applied Materials & Interfaces (2023)

Futong Liu Gongyi Cao Zijun Feng Zhuang Cheng Yan Yan

Developing high-efficiency nondoped blue organic light-emitting diodes (OLEDs) with high color purity and low-efficiency roll-off is vital for display and lighting applications. Herein, we developed two asymmetric D-π–A blue emitters, PIAnTP and PyIAnTP, in which triphenylene is first utilized as a functional acceptor. The relatively weak charge transfer (CT) properties, rigid molecular structures, and multiple supramolecular interactions in PIAnTP and PyIAnTP can significantly enhance the fluorescence efficiency and suppress the structural relaxations to obtain a narrowband blue emission. The photophysical experiments and theoretical simulations reveal that they both exhibit a typical hybridized local and charge-transfer (HLCT) excited state and achieve high external quantum efficiency (EQE) via a "hot exciton" channel. As a result, PIAnTP- and PyIAnTP-based nondoped devices realize blue emission at 456 and 464 nm, corresponding to CIE coordinates of (0.16, 0.14) and (0.16, 0.19), narrow full width at half-maximums of 52 and 60 nm, and the high EQEs of 8.36 and 8.69%, respectively. More importantly, the PIAnTP- and PyIAnTP-based nondoped devices show small EQE roll-offs of only 5.9 and 2.4% at 1000 cd m–2, respectively. These results signify an advance in designing a highly efficient blue emitter for nondoped OLEDs.

Triphenylene

Narrowband

10.1021/acsami.3c09433

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Citations (19)

CCDC 2092960: Experimental Crystal Structure Determination

The Cambridge Structural Database (2023)

Futong Liu Zhuang Cheng Liang Wan Zijun Feng Hui Liu

10.5517/ccdc.csd.cc287wv8

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