4.7 Article

Multi-spiro junctions enable efficient thermally activated delayed fluorescent emitter

Related references

Note: Only part of the references are listed.
Article Optics

Ultrapure green organic light-emitting diodes based on highly distorted fused π-conjugated molecular design

Xiao-Chun Fan et al.

Summary: Researchers have developed a new ultrapure green emitter called DBTN-2, which greatly improves the efficiency and color purity of OLED technology. The unique molecular design of this material reduces relaxation energy between excited and ground states and enhances spin-orbit couplings, resulting in highly efficient operation. These advancements make DBTN-2 a promising candidate for commercial green OLED displays.

NATURE PHOTONICS (2023)

Article Multidisciplinary Sciences

Realizing efficient blue and deep-blue delayed fluorescence materials with record-beating electroluminescence efficiencies of 43.4%

Yan Fu et al.

Summary: Three highly efficient blue and deep-blue delayed fluorescence materials with excellent electroluminescence performance were reported. They exhibit superb blue and deep-blue electroluminescence and were successfully used as sensitizers for high-performance deep-blue and green hyperfluorescence OLEDs.

NATURE COMMUNICATIONS (2023)

Article Chemistry, Multidisciplinary

Donor Extension on Spiro-Acridine Enables Highly Efficient TADF-OLEDs with Relieved Efficiency Roll-Off

Hao Peng et al.

Summary: This study develops three thermally activated delayed fluorescent (TADF) emitters based on fluorene-spiro-acridine derivatives as donors, which exhibit high external quantum efficiency (EQE) and low efficiency roll-off. The emitters achieve high photoluminescence quantum yields (PLQYs) of 96-99% due to the rigid donor and acceptor composition. The enhancement of reverse intersystem crossing (k(RISC)) in IA-TRZ and the acceleration of radiative decay rate (k(r)) in 2S-TRZ and IT-TRZ contribute to their high electroluminescent performance.

ADVANCED FUNCTIONAL MATERIALS (2023)

Article Chemistry, Multidisciplinary

Multiple Fusion Strategy for High-Performance Yellow OLEDs with Full Width at Half Maximums Down to 23 nm and External Quantum Efficiencies up to 37.4%

Yuewei Zhang et al.

Summary: A novel multiple fusion molecular design strategy is proposed to break the trade-off between effective spectral redshift and small FWHM value in ideal narrowband yellow MR emitters. The proof-of-the-concept emitters show bright yellowish green to yellow emissions with extremely small FWHMs. In addition, the corresponding electroluminescent device based on the novel design exhibits excellent efficiencies and represents the best performance for yellow MR organic light-emitting diodes.

ADVANCED MATERIALS (2023)

Article Engineering, Environmental

Modulating LUMO extension of Spiro-junction TADF emitters for efficient OLEDs with relieved efficiency Roll-Off

Ranran Pei et al.

Summary: In this study, a series of TADF emitters based on spiro-junction were designed and synthesized via a LUMO extension strategy to optimize the roll-off and comprehend the structure-property relationship. Among them, SIR-B exhibited the best performance, showing potential for the development of efficient OLEDs with small efficiency roll-off.

CHEMICAL ENGINEERING JOURNAL (2022)

Article Optics

Efficient selenium-integrated TADF OLEDs with reduced roll-off

Yu Xuan Hu et al.

Summary: This study reports a heavy-atom incorporating emitter, BNSeSe, based on a selenium-integrated boron-nitrogen skeleton, which exhibits high photoluminescence quantum yield and fast reverse intersystem crossing rate. By utilizing BNSeSe, green OLEDs demonstrate high operational efficiency and significantly reduced efficiency roll-off at high brightness.

NATURE PHOTONICS (2022)

Article Multidisciplinary Sciences

Toward a BT.2020 green emitter through a combined multiple resonance effect and multi-lock strategy

Junyuan Liu et al.

Summary: The authors successfully doped green-emitting molecules into organic light-emitting diodes using multiple resonance effect and multi-lock strategy, achieving a device with Broadcast Service Television 2020 color-gamut, 50% improved EQE, and high luminescence. The green emitters with high color saturation and potential applications for displays and imaging were linked through bonding and spiro-carbon bridges, resulting in the purest green molecules with comparable quantum efficiency.

NATURE COMMUNICATIONS (2022)

Article Chemistry, Multidisciplinary

Highly efficient and stable deep-blue OLEDs based on narrowband emitters featuring an orthogonal spiro-configured indolo[3,2,1-de]acridine structure

Guoyun Meng et al.

Summary: Efficient and stable deep-blue bottom-emitting organic light-emitting diodes with narrowband emitters, especially nitrogen-containing spiro-configured polycyclic frameworks, have been successfully developed. These emitters exhibit narrow emission peaks, small CIE(y) values, long lifetimes, and high quantum efficiencies, demonstrating excellent performance for deep-blue devices.

CHEMICAL SCIENCE (2022)

Article Optics

Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission

Chin-Yiu Chan et al.

Summary: This study presents pure-blue OLEDs with high efficiency, narrow emission, and good stability, showing promise for display applications. The design is based on a two-unit stacked tandem hyperfluorescence OLED with strict control of device fabrication and procedures to further improve device lifetimes.

NATURE PHOTONICS (2021)

Article Chemistry, Multidisciplinary

A TADF Emitter Featuring Linearly Arranged Spiro-Donor and Spiro-Acceptor Groups: Efficient Nondoped and Doped Deep-Blue OLEDs with CIEy <0.1

Guoqi Xia et al.

Summary: This study presents a molecular design strategy for efficient deep-blue organic light-emitting diodes (OLEDs) with desirable CIEy color coordinates, achieving high quantum efficiencies and meeting display requirements.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Optics

High-efficiency, long-lifetime deep-blue organic light-emitting diodes

Soon Ok Jeon et al.

Summary: By combining a new design of blue TADF materials with a triplet-exciton recycling protocol, high efficiency and long lifetime were achieved in deep-blue organic light-emitting diodes.

NATURE PHOTONICS (2021)

Article Chemistry, Multidisciplinary

Peripheral Decoration of Multi-Resonance Molecules as a Versatile Approach for Simultaneous Long-Wavelength and Narrowband Emission

Yanyu Qi et al.

Summary: A new approach of peripherally decorating MR emitter with electron donors enables the emission spectra of MR emitters to red-shift while retaining narrowband emission, leading to the realization of the first narrowband yellow emitter with emission maxima of 562 nm and excellent color purity. Highly efficient OLEDs with an external quantum efficiency of over 24% are fabricated by employing these newly developed MR molecules as emitters.

ADVANCED FUNCTIONAL MATERIALS (2021)

Article Chemistry, Multidisciplinary

Versatile Direct Cyclization Constructs Spiro-acridan Derivatives for Highly Efficient TADF emitters

He Liu et al.

Summary: A simple acid-catalyzed solvent-free metal-free cyclization method between diarylamines and ketones is proposed to construct SpAs, providing a wide range of possibilities for efficient TADF emitters. By applying D2T-TR in OLEDs, a maximum external quantum efficiency of 27.1% is achieved, demonstrating the potential of this method for developing excellent organic optoelectronic materials.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Materials Science, Multidisciplinary

Side by Side Alignment of Donors Enabling High-Efficiency TADF OLEDs with Insensitivity to Doping Concentration

Zhiwen Liu et al.

Summary: This study proposes a side by side donor alignment strategy to achieve decent electroluminescence performance under high doping concentration, by investigating the structure-property relationship of two emitters D2T-TRZ and D2Y-TRZ. The results reveal that TADF emitters with parallel aligned donors, such as D2T-TRZ, show higher efficiency and are less sensitive to doping concentration compared to those with antiparallel acridans like D2Y-TRZ.

ADVANCED OPTICAL MATERIALS (2021)

Article Chemistry, Multidisciplinary

Approaching Nearly 40% External Quantum Efficiency in Organic Light Emitting Diodes Utilizing a Green Thermally Activated Delayed Fluorescence Emitter with an Extended Linear Donor-Acceptor-Donor Structure

Yang Chen et al.

Summary: The study developed a high-performance TADF emitter with controlled molecular orientation and optoelectronic properties, achieving high quantum yield and fast intersystem crossing rate. The corresponding OLED device demonstrated impressive efficiency performance, pushing the device efficiency towards theoretical limits.

ADVANCED MATERIALS (2021)

Article Chemistry, Multidisciplinary

Wide-Range Color Tuning of Narrowband Emission in Multi-resonance Organoboron Delayed Fluorescence Materials through Rational Imine/Amine Functionalization

Minlang Yang et al.

Summary: Establishing a simple and versatile design strategy to modulate emission colors while maintaining high efficiency and color purity is challenging for MR-TADF materials. By introducing specific functional groups, it is possible to achieve fine tuning of emission colors without compromising narrow spectral features, leading to the development of high-efficiency and color-pure organic light-emitting diodes.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

Article Chemistry, Physical

Highly efficient luminescence from space-confined charge-transfer emitters

Xun Tang et al.

NATURE MATERIALS (2020)

Article Chemistry, Multidisciplinary

Tri-Spiral Donor for High Efficiency and Versatile Blue Thermally Activated Delayed Fluorescence Materials

Wei Li et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2019)

Article Multidisciplinary Sciences

Revealing the spin-vibronic coupling mechanism of thermally activated delayed fluorescence

Marc K. Etherington et al.

NATURE COMMUNICATIONS (2016)

Article Chemistry, Multidisciplinary

Multiwfn: A multifunctional wavefunction analyzer

Tian Lu et al.

JOURNAL OF COMPUTATIONAL CHEMISTRY (2012)

Article Multidisciplinary Sciences

Highly efficient organic light-emitting diodes from delayed fluorescence

Hiroki Uoyama et al.

NATURE (2012)