High-performance nanothermometry system with controlled sensitivity based on dual-emission CsPbBr/CdTe@SiO core/shell nanocomposites.

Quantum dots (QDs) with dual-emission property have garnered significant attention as prototype platforms for temperature measurement due to their self-calibration capabilities and high sensitivity. The assembly and property modulation of this materials hold great research value. In this work, we propose a strategy to utilize dendritic mesoporous SiO core-shell spheres to encapsulate dual QDs, enabling the constructing of dual-emission fluorescent temperature sensing system. By encapsulating CsPbBr and CdTe QDs in SiO core-shell spheres, we developed a dual-emission temperature probe that employs two thermometry modes: peak wavelength spacing variation and fluorescence intensity ratio. This probe offers advantages such as high thermal stability, excellent fit, and high sensitivity. Additionally, inspired by the concept of series sliding resistors, we introduced a novel approach to adjust the probe's sensitivity by treating the fluorescence intensity and peak wavelength of the dual QDs as the "sliding resistor". This innovation results in a temperature fluorescence sensing system with tunable sensitivity. We also explored the potential applications of these probes in temperature measurement, light-emitting diodes, and fluorescent anti-counterfeiting. Our research presents an effective strategy for the rational design of high-performance dual-emission fluorescence temperature sensing systems with customizable sensitivity.