Kenichi Goushi*, Masahiro Nagano and Chihaya Adachi*,
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Low-Threshold Amplified Spontaneous Emission of Benzobisoxazole Derivatives in a Doped Film
In this study, we focus on benzobisoxazole (BOX) derivatives with the aim of achieving large stimulated emission cross sections, which are expected to contribute to lower laser thresholds and high stability. While both optically and electrically pumped organic semiconductor lasers have the potential to provide miniaturized lasers with wavelength tunability from ultraviolet to infrared, the development of organic semiconductors with low laser thresholds remains crucial for realizing stable devices. We report a low amplified spontaneous emission (ASE) threshold of BOX derivatives, which are doped into 4,4′-bis(carbazol-9-yl)biphenyl (CBP) host layers, with values as low as approximately 1 μJ/cm2. Further, we demonstrate high photostability under continuous photoexcitation, suggesting that BOX derivatives are promising candidates as emitting materials for organic semiconductor lasers (OSLs).
期刊介绍：
ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.
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