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Robust and Stable Ratiometric Temperature Sensor Based on Zn-In-S Quantum Dots with Intrinsic Dual-Dopant Ion Emissions.
- Source :
-
Advanced Functional Materials . 10/25/2016, Vol. 26 Issue 40, p7224-7233. 10p. - Publication Year :
- 2016
-
Abstract
- 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1616301X
- Volume :
- 26
- Issue :
- 40
- Database :
- Academic Search Index
- Journal :
- Advanced Functional Materials
- Publication Type :
- Academic Journal
- Accession number :
- 119062026
- Full Text :
- https://doi.org/10.1002/adfm.201603201