DataVXAdvanced Optical MaterialsPaper
journal article·2017-06

Light Amplification in Molecules Exhibiting Thermally Activated Delayed Fluorescence

Hajime Nakanotani, Taro Furukawa, Takuya Hosokai, Takuji Hatakeyama, Chihaya Adachi

Advanced Optical Materials· Volume 5· Issue 12
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Source abstract

Abstract

To reduce the threshold current density and move closer toward the realization of future current‐injection organic semiconductor lasers, the harvesting of triplet excitons is anticipated because 75% excitons are directly formed as triplet excited states under electrical excitation according to spin statics. However, the observation of light amplification in pure phosphorescent or thermally activated delayed fluorescence (TADF) materials has nor yet been reported even under optical excitation. Herein, light amplification was observed in the TADF emitter 9‐([1,1′‐biphenyl]‐3‐yl)‐N,N,5,11‐tetraphenyl‐5,9‐dihydro‐5,9‐diaza‐13b‐boranaphtho[3,2,1‐de]anthracen‐3‐amine (DABNA‐2). It is found that DABNA‐2 possesses not only a large stimulated emission cross‐section but also a favorable window for light amplification. These results indicate that TADF emitters can form a new category of laser dyes and are important candidates for the realization of an organic semiconductor laser.
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Research context

Electronic materials

OpenAlex topics: Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials · Organic Electronics and Photovoltaics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Center for Organic Photonics and Electronics Research (OPERA) Kyushu University 744 Motooka Nishi Fukuoka 819‐0395 Japan

JST ERATO Adachi Molecular Exciton Engineering Project c/o Center for Organic Photonics and Electronics Research (OPERA) Kyushu University 744 Motooka Nishi Fukuoka 819‐0395 Japan

International Institute for Carbon Neutral Energy Research (WPI‐I2CNER) Kyushu University 744 Motooka Nishi Fukuoka 819‐0395 Japan

National Metrology Institute of Japan National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 2, 1‐1‐1 Umezono Tsukuba Ibaraki 305‐8568 Japan

Department of Chemistry School of Science and Technology Kansei Gakuin University 2‐1 Gakuen Sanda Hyogo 669‐1337 Japan

Funding

Japan Science and Technology Agency

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