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15 results on '"Wen, Ruijuan"'

5. ZnSe/ZnS Core–Shell Quantum Dots Doped with Mn2+ Ions for Magnetic State-Manipulated Light Sources

Author

Wang, Hongyue, primary, Gao, Jialiang, additional, Zhang, Miao, additional, Liu, Peng, additional, Guo, Yangyang, additional, Li, Huixin, additional, Zhao, Guanguan, additional, Hu, Siliang, additional, Cheng, Zeyi, additional, Zang, Jianyang, additional, Wen, Ruijuan, additional, Liu, Taihong, additional, Tong, Yu, additional, Sun, Zhenhua, additional, and Wang, Hongqiang, additional

Published
2022
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9. ZnSe/ZnS Core–Shell Quantum Dots Doped with Mn2+ Ions for Magnetic State-Manipulated Light Sources.

Author

Wang, Hongyue, Gao, Jialiang, Zhang, Miao, Liu, Peng, Guo, Yangyang, Li, Huixin, Zhao, Guanguan, Hu, Siliang, Cheng, Zeyi, Zang, Jianyang, Wen, Ruijuan, Liu, Taihong, Tong, Yu, Sun, Zhenhua, and Wang, Hongqiang

Abstract

Spintronic states-associated photoluminescence (PL) is of interest and essential for electronic spin-manipulated information storage and communications. Manganese ions (Mn2+)-doped semiconductor quantum dots (QDs) exhibit a unique PL that comes from the spin-forbidden 4T1–6A1 d–d transition of Mn2+, which is a promising candidate for a spin-manipulated light source. However, the interplay of PL quantum yield (PL QY) and the magnetic states of Mn2+ dopants is still vague. In this work, we systematically investigate the spectroscopic properties of Mn2+-doped ZnSe/ZnS core–shell QDs. By increasing the doping concentration, the PL QY of the Mn2+ dopant is increased to a maximum of 43.2% (2% Mn2+-doped QDs) before decreasing for higher-doped QDs (10% Mn2+-doped QDs). We further found that the high doping in the QDs induces the magnetic coupling of Mn2+ ions, which leads to a larger PL intensity and line-width variation as a function of the temperature from 300 to 80 K. The abnormal PL line-width derivation of high-doped QDs occurs around 150 and 240 K, where would be the Neel temperature of MnS and MnSe, respectively, which allows transition between para-magnetism and anti-ferromagnetism. Our findings of doping-concentration-dependent PL QY and magnetism transition-related PL variation in this work offer a vision for the spintronic states-associated PL of the Mn2+ dopant in the QD host. [ABSTRACT FROM AUTHOR]

Published
2022
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