Hasegawa Yasuchika, Koide Katsumasa, Tsurui Makoto, Kitagawa Yuichi, Nakanishi Takayuki, Doi Yoshihiro, Hinatsu Yukio, Fushimi Koji
Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Sapporo, Hokkaido, 001-0021, Japan.
Faculty of Engineering, Hokkaido University, N13W8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan.
Chemphyschem. 2020 Sep 2;21(17):2019-2024. doi: 10.1002/cphc.202000468. Epub 2020 Aug 19.
Semiconductor nanomaterials with efficient polarized-light control in the blue region of the visible spectrum are promising candidates for modern and future photo-information technology, display devices, and optical sensing applications. New-type semiconductor Eu(OCN) nanocrystals with circularly polarized absorption (CD: circular dichroism) and emission (CPL: circularly polarized luminescence) under an applied magnetic field are demonstrated here for the first time. The effective CD signal at 1.6 T was observed at approximately 440 nm. The dissymmetry factor of CPL under 100 K, g was estimated to be 0.01. These characteristic circularly polarized absorption and emission phenomena of Eu(OCN) nanocrystals should be caused by combination between the "Faraday A and C terms" of the magnetic moment in the excited state. Polarized-light control using Eu(OCN) nanocrystals in the blue-light region of the electromagnetic spectrum is a large first step into a new world of photo-functional semiconductor nanomaterials.
在可见光谱的蓝色区域具有高效偏振光控制能力的半导体纳米材料，是现代及未来光信息技术、显示设备和光学传感应用的理想候选材料。本文首次展示了新型半导体Eu(OCN)纳米晶体在施加磁场下具有圆偏振吸收（CD：圆二色性）和发射（CPL：圆偏振发光）特性。在1.6 T磁场下，在约440 nm处观察到有效的CD信号。在100 K下，CPL的不对称因子g估计为0.01。Eu(OCN)纳米晶体的这些特征性圆偏振吸收和发射现象应是由激发态磁矩的“法拉第A项和C项”之间的组合引起的。在电磁光谱的蓝光区域使用Eu(OCN)纳米晶体进行偏振光控制，是迈向光功能半导体纳米材料新世界的重要第一步。
