Robust and Stable Ratiometric Temperature Sensor Based on Zn-In-S Quantum Dots with Intrinsic Dual-Dopant Ion Emissions
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- 作者：Sheng Cao ; Jinju Zheng ; Jialong Zhao ; Zuobao Yang ; Minghui Shang ; Chengming Li ; Weiyou Yang and Xiaosheng Fang
- 刊名：Advanced Functional Materials
- 出版年：2016
- 出版时间：October 25, 2016
- 年：2016
- 卷：26
- 期：40
- 页码：7224-7233
- 全文大小：1540K
- ISSN：1616-3028
文摘
Dual emission quantum dots (QDs) have attracted considerable interest as a novel phosphor for constructing ratiometric optical thermometry because of its self-referencing capability. In this work, the exploration of codoped Zn–In–S QDs with dual emissions at ≈512 and ≈612 nm from intrinsic Cu and Mn dopants for ratiometric temperature sensing is reported. It is found that the dopant emissions can be tailored by adjusting the Mn-to-Cu concentration ratios, enabling the dual emissions in a tunable manner. The energy difference between the conduction band of the host and Cu dopant states is considered as the key for the occurrence of Mn ion emission. The as-constructed QD ratiometric temperature sensor exhibits a totally robust stability with a fluctuation of ≈ICu/Itot versus times lower than 1% and almost no hysteresis in cycles over a broad window of 100–320 K. This discovery represents that the present cadmium-free, intrinsic dual-emitting codoped QDs can open a new door for the synthesis of novel QDs with stable dual emissions, which poise them well for challenging applications in optical nanothermometry.