Improving Photoluminescence Emission Efficiency of Nanocluster-Based Materials by in Situ Doping Synthetic Strategy

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• 作者：Jian Lin ; Dan-Dan Hu ; Qian Zhang ; Dong-Sheng LiTao Wu ; Xianhui BuPingyun Feng
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：December 29, 2016
• 年：2016
• 卷：120
• 期：51
• 页码：29390-29396
• 全文大小：582K
• ISSN：1932-7455

文摘

Solid-state red phosphors of Mn²⁺-doped nanocrystals usually suffer from poor intensity. While the d–d emission of Mn²⁺ in yellow window has been extensively studied, shift toward lower energy remains challenging. Typically, intrinsic surface defects and self-purification of dopants are two obstacles for enhancing the intensity of red emission. Moreover, for red phosphors Mn²⁺ ions also need an appropriate host matrix and environment. Through an in situ doping strategy and optimization of the Mn²⁺ doping level, intense red-emitting Mn²⁺ dopant emission is reported here for MnCdInS@InS host. The doping strategy allows doping of Mn²⁺ at the core and/or surface sites of supertetrahedral “core–shell” nanocluster (Mn@MnCdInS@InS), leading to the red emission (at 643 nm) with over 40% quantum yield. Moreover, systematic control of doping level results in a series of crystalline Mn²⁺-doped materials with tunable photoluminescence quantum yield. In addition to the synthesis of an important class of red-emitting materials rarely obtained from Mn²⁺ doping, details of the physical chemistry associated with the doping process are probed with the new fundamental findings reported here.