Arturs Mazarevics, Artis Kinens, Kaspars Leduskrasts, Edgars Suna
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引用次数: 0
Abstract
Despite phosphorescent materials having found wide application in optoelectronic and biological areas, the mechanistic understanding of ultralong room temperature phosphorescence (RTP) from metal-free emitters is underdeveloped. Recently, an increasing number of reports have suggested that RTP from purely organic phosphorescent materials requires the presence of trace impurities or dopants in the bulk emitter. Contributing to a better understanding of mechanistic aspects, we demonstrate that the RTP lifetime is directly proportional to intermolecular charge transfer (CT) properties of the crystalline bulk emitter. Given that the CT efficiency is contingent on crystal packing arrangement, variations of interemitter distances in the crystal lattice by modulating sterics of the emitter core structure represent an efficient means to manipulate the dopant-induced RTP lifetime. The versatility of the “steric modulation” approach has been demonstrated in two different dopant/emitter systems. A 38-fold increase (from 21 to 775 ms) was observed in the RTP lifetime of benzo[b]carbazole-doped carbazole-containing materials.
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.