A very low lasing threshold of DABNA derivatives with DFB structures

Article Chemistry, Physical

Numerical Study of Triplet Dynamics in Organic Semiconductors Aimed for the Active Utilization of Triplets by TADF under Continuous-Wave Lasing

Ayano Abe et al.

Summary: This study proposes a solution to the triplet accumulation problem in organic solid-state continuous-wave lasers by utilizing thermally activated delayed fluorescence (TADF) emitters.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2022)

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Review Chemistry, Multidisciplinary

Thermally Activated Delayed Fluorescent Gain Materials: Harvesting Triplet Excitons for Lasing

Chang-Cun Yan et al.

Summary: This mini review summarizes recent progress in thermally activated delayed fluorescent (TADF) gain materials and extracts design principles from existing reports. It also introduces the construction methods of resonators based on TADF gain materials and presents the challenges and perspectives for the future development of TADF gain materials.

ADVANCED SCIENCE (2022)

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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)

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Article Materials Science, Multidisciplinary

Controlling triplet-triplet upconversion and singlet-triplet annihilation in organic light-emitting diodes for injection lasing

Atul Shukla et al.

Summary: Significant progress has been made in the field of organic solid-state lasers. The challenge of achieving lasing action from organic semiconductors under electrical excitation due to energy losses introduced by triplet excitons has been addressed in this study. Experimental and theoretical results demonstrate the positive contribution of triplet excitons through a bimolecular triplet-triplet upconversion mechanism. The study also presents an experimental strategy to simultaneously achieve high triplet-triplet upconversion and low singlet-triplet annihilation, resulting in improved performance in organic light-emitting diodes.

COMMUNICATIONS MATERIALS (2022)

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Review Chemistry, Multidisciplinary

A Brief History of OLEDs-Emitter Development and Industry Milestones

Gloria Hong et al.

Summary: Organic light-emitting diodes (OLEDs) have undergone significant development over the past 30 years, with advancements in emitter materials leading to three generations of OLED devices. Research is now focused on the fourth generation of OLEDs, with academia and industry achieving milestones in the development of green, orange-red, and blue OLED emitters.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Carbazole-Based DABNA Analogues as Highly Efficient Thermally Activated Delayed Fluorescence Materials for Narrowband Organic Light-Emitting Diodes

Susumu Oda et al.

Summary: Carbazole-based DABNA analogues were synthesized through regioselective one-shot single and double borylation, demonstrating narrowband thermally activated delayed fluorescence. Organic light-emitting diode devices utilizing these products as emitters exhibited deep-blue, sky-blue, and green emission with high external quantum efficiencies.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2021)

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Review Chemistry, Multidisciplinary

Development of One-Shot/One-Pot Borylation Reactions toward Organoboron-Based Materials

Susumu Oda et al.

Summary: This study demonstrates efficient borylation reactions of arenes toward organoboron-based materials, resulting in the construction of polycyclic frameworks with ring-junction boron atoms. Electron-rich arenes can undergo one-shot multiple borylations, leading to compounds with attractive optoelectronic properties and substantial stabilities. These reactions are efficient, easy to scale up, and do not require precious reagents, paving the way for the development of next-generation optoelectronic materials.

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN (2021)

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Article Materials Science, Multidisciplinary

Realizing Near-Infrared Laser Dyes through a Shift in Excited-State Absorption

Reiko Aoki et al.

Summary: This study demonstrates a highly efficient NIR emitter based on a boron difluoride curcuminoid structure, showing high photoluminescence quantum yield and fluorescence radiative rate constant in a solid-state film, leading to amplified spontaneous emission and lasing. The large redshift of the stimulated emission is attributed to the transition between the lowest excited state and different vibrational levels of the ground state.

ADVANCED OPTICAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Intramolecular-Locked High Efficiency Ultrapure Violet-Blue (CIE-y <0.046) Thermally Activated Delayed Fluorescence Emitters Exhibiting Amplified Spontaneous Emission

Aziz Khan et al.

Summary: The rational manipulation of molecular frontier orbital distribution and singlet-triplet splitting is crucial for exploiting the luminescent properties of organic molecules. In this study, a new TADF skeleton is developed by inserting a diphenyl methylene intramolecular lock to adjust torsion angles and restrict intramolecular relaxation. Two rigid emitters show narrow FWHMs and emit in deep blue and violet-blue, with fast S-1-S-0 transition rates and low ASE thresholds.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Light Amplification and Efficient Electroluminescence from a Solution-Processable Diketopyrrolopyrrole Derivative via Triplet-to-Singlet Upconversion

Atul Shukla et al.

Summary: Efficient electroluminescence (EL) and low amplified spontaneous emission (ASE) thresholds were achieved in a solution-processable organic laser dye, DT-DPP, through the use of triplet excitons and thermally activated delayed fluorescence (TADF). The organic light-emitting diode fabricated from this system showed a high external quantum efficiency (EQE) of 7.9% due to the efficient utilization of triplet excitons. High reverse intersystem crossing rate was found to be crucial in achieving lasing under electrical pumping from such TADF-assisted fluorescent systems.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Thermally Activated Lasing in Organic Microcrystals toward Laser Displays

Tongjin Zhang et al.

Summary: This work demonstrates thermally activated lasing in coassembled microcrystals where TADF dyes are uniformly dispersed in crystalline matrices for efficient reverse intersystem crossing (RISC). The dark-state triplet excitons are effectively converted into radiative singlet excitons through RISC, leading to population inversion and boosting lasing with an unusual temperature dependence. The lasing wavelength can be tuned over the full visible spectrum by doping various TADF laser dyes, and trichromatic TADF microlasers can be precisely patterned into periodic pixelated arrays.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2021)

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Article Materials Science, Multidisciplinary

A periphery cladding strategy to improve the performance of narrowband emitters, achieving deep-blue OLEDs with CIEy < 0.08 and external quantum efficiency approaching 20%

Yaxiong Wang et al.

Summary: By using a novel molecular design strategy involving periphery cladding, deep-blue thermally activated delayed fluorescence (TADF) emitters with National Television System Committee (NTSC) standard and narrowband emission were successfully synthesized. Among them, 3tPAB exhibited the highest emission efficiency and overall performance.

ORGANIC ELECTRONICS (2021)

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Article Chemistry, Multidisciplinary

Tunable Triplet-Mediated Multicolor Lasing from Nondoped Organic TADF Microcrystals

Yuan Li et al.

Summary: This research demonstrated a three-color micro-laser from three controlled TADF microcrystals, with temperature-dependent dynamic analysis confirming thermally activated lasing actions. The study offers insights for the rational design of pure TADF gain materials and guidance for high-performance electrically driven organic solid-state lasers.

NANO LETTERS (2021)

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Article Chemistry, Multidisciplinary

Manipulation of Charge-Transfer States by Molecular Design: Perspective from Dynamic Exciton

Hiroshi Imahori et al.

Summary: Dynamic exciton, as an important concept in photochemistry, covers various aspects in nature, science, and technology, especially in photoinduced and electrically induced electron transfer. It includes locally excited, charge-transfer, and charge-separated states, with key factors such as CT degree, spin multiplicity, and D-A interaction. The concept of dynamic exciton provides a new approach for innovative designs of energy conversion materials and assemblies, emphasizing the cooperation between nuclear motions and electron-phonon coupling.

ACCOUNTS OF MATERIALS RESEARCH (2021)

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Review Chemistry, Multidisciplinary

Multiresonant Thermally Activated Delayed Fluorescence Emitters Based on Heteroatom-Doped Nanographenes: Recent Advances and Prospects for Organic Light-Emitting Diodes

Subeesh Madayanad Suresh et al.

ADVANCED FUNCTIONAL MATERIALS (2020)

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Article Optics

Fast spin-flip enables efficient and stable organic electroluminescence from charge-transfer states

Lin-Song Cui et al.

NATURE PHOTONICS (2020)

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Article Optics

Organic light emitters exhibiting very fast reverse intersystem crossing

Yoshimasa Wada et al.

NATURE PHOTONICS (2020)

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Article Multidisciplinary Sciences

Charge and exciton dynamics of OLEDs under high voltage nanosecond pulse: towards injection lasing

Viqar Ahmad et al.

NATURE COMMUNICATIONS (2020)

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Article Materials Science, Multidisciplinary

Lasing Operation under Long-Pulse Excitation in Solution-Processed Organic Gain Medium: Toward CW Lasing in Organic Semiconductors

Van T. N. Mai et al.

ADVANCED OPTICAL MATERIALS (2020)

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Article Materials Science, Multidisciplinary

Design Strategy for Robust Organic Semiconductor Laser Dyes

Yuya Oyama et al.

ACS MATERIALS LETTERS (2020)

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Article Physics, Applied

Indication of current-injection lasing from an organic semiconductor

Atula S. D. Sandanayaka et al.

APPLIED PHYSICS EXPRESS (2019)

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Article Optics

Narrowband deep-blue organic light-emitting diode featuring an organoboron-based emitter

Yasuhiro Kondo et al.

NATURE PHOTONICS (2019)

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Article Materials Science, Multidisciplinary

Ideal blue thermally activated delayed fluorescence emission assisted by a thermally activated delayed fluorescence assistant dopant through a fast reverse intersystem crossing mediated cascade energy transfer process

Si Hyun Han et al.

JOURNAL OF MATERIALS CHEMISTRY C (2019)

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Article Chemistry, Multidisciplinary

One-Shot Multiple Borylation toward BN-Doped Nanographenes

Kohei Matsui et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2018)

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Article Chemistry, Multidisciplinary

Low Amplified Spontaneous Emission Threshold from Organic Dyes Based on Bis-stilbene

Masashi Mamada et al.

ADVANCED FUNCTIONAL MATERIALS (2018)

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Article Optics

High-efficiency electroluminescence and amplified spontaneous emission from a thermally activated delayed fluorescent near-infrared emitter

Dae-Hyeon Kim et al.

NATURE PHOTONICS (2018)

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Light Amplification in Molecules Exhibiting Thermally Activated Delayed Fluorescence

Hajime Nakanotani et al.

ADVANCED OPTICAL MATERIALS (2017)

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Article Multidisciplinary Sciences

Toward continuous-wave operation of organic semiconductor lasers

Atula S. D. Sandanayaka et al.

SCIENCE ADVANCES (2017)

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Extremely low amplified spontaneous emission threshold and blue electroluminescence from a spin-coated octafluorene neat film

D. -H. Kim et al.

APPLIED PHYSICS LETTERS (2017)

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Article Chemistry, Multidisciplinary

Ultrapure Blue Thermally Activated Delayed Fluorescence Molecules: Efficient HOMO-LUMO Separation by the Multiple Resonance Effect

Takuji Hatakeyama et al.

ADVANCED MATERIALS (2016)

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Review Chemistry, Multidisciplinary

Organic Lasers: Recent Developments on Materials, Device Geometries, and Fabrication Techniques

Alexander J. C. Kuehne et al.

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Quasi-Continuous-Wave Organic Thin-Film Distributed Feedback Laser

Atula S. D. Sandanayaka et al.

ADVANCED OPTICAL MATERIALS (2016)

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Light Amplification in an Organic Solid-State Film with the Aid of Triplet-to-Singlet Upconversion

Hajime Nakanotani et al.

ADVANCED OPTICAL MATERIALS (2015)

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Highly efficient organic light-emitting diodes from delayed fluorescence

Hiroki Uoyama et al.

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Recent advances in solid-state organic lasers

Sebastien Chenais et al.

POLYMER INTERNATIONAL (2012)

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Low-Threshold Distributed-Feedback Lasers Based on Pyrene-Cored Starburst Molecules with 1,3,6,8-Attached Oligo(9,9-Dialkylfluorene) Arms

Ruidong Xia et al.

ADVANCED FUNCTIONAL MATERIALS (2009)

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Imidazole-based excited-state intramolecular proton-transfer(ESIPT) materials: Observation of thermally activated delayed fluorescence(TDF)

Sanghyuk Park et al.

JOURNAL OF PHYSICAL CHEMISTRY A (2007)

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Extremely low-threshold amplified spontaneous emission of 9,9′-spirobifluorene derivatives and electroluminescence from field-effect transistor structure

Hajime Nakanotani et al.

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Improved organic semiconductor lasers based on a mixed-order distributed feedback resonator design

C. Karnutsch et al.

APPLIED PHYSICS LETTERS (2007)

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Organic semiconductor lasers

I. D. W. Samuel et al.

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Quasi-continuous-wave operation of an organic thin-film distributed feedback laser

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APPLIED PHYSICS LETTERS (2006)

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Continuous-wave solid-state dye laser

R. Bornemann et al.

OPTICS LETTERS (2006)

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Imidazole-based excited-state intramolecular proton-transfer materials: Synthesis and amplified spontaneous emission from a large single crystal

S Park et al.

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Sensitivity gains in chemosensing by lasing action in organic polymers

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Low-threshold blue amplified spontaneous emission in a statistical copolymer and its blend

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A very low lasing threshold of DABNA derivatives with DFB structures

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