Analytical Chemistry (journal)

Photon upconversion

Optics

Physics

Luminescence

Perovskite (structure)

Exciton

Organic chemistry

Chemistry

Materials science

Spectroscopy

Chromatography

Optoelectronics

Erbium

Laser

Ytterbium

Doping

Quantum mechanics

Crystallography

Excitation

Photoluminescence

Fluorescence

The Journal of Physical Chemistry Letters

In this Letter, erbium (Er3+) and ytterbium (Yb3+) codoped perovskite Cs2Ag0.6Na0.4In0.9Bi0.1Cl6 microcrystal (MC) is synthesized and demonstrated systematically to the most prospective optical temperature sensing materials. A dual-mode thermometry based on fluorescence intensity ratio and fluorescence lifetime provides a self-reference and highly sensitive temperature measurement under dual wavelength excitation at a temperature from 300 to 470 K. Combined with the white-light emission derived from self-trapped excitons (STEs), the characteristic emission peak of Er3+ ions can be observed under 405 nm laser excitation. The fluorescence intensity ratio (FIR) between perovskite and Er3+ is used as temperature-dependent probe signal, of which maximum value for relative and absolute sensitivities reaches to 1.40% K-1 and 8.20 × 10-2 K-1. Moreover, Er3+ luminescence becomes stronger with the feeding Yb3+ increasing under 980 nm laser excitation. The energy transfer of Er3+ and Yb3+ is revealed by power-dependent photoluminescence (PL) spectroscopy, and the involved upconversion mechanism pertains to the two-photon excitation process. The results reveal that the Er3+/Yb3+ codoped lead-free double perovskite MC is a good candidate for a thermometric material for the novel dual-mode design.

Highly Sensitive Dual-Mode Optical Thermometry of Er<sup>3+</sup>/Yb<sup>3+</sup> Codoped Lead-Free Double Perovskite Microcrystal

Highly Sensitive Dual-Mode Optical Thermometry of Er3+/Yb3+ Codoped Lead-Free Double Perovskite Microcrystal

Highly Sensitive Dual-Mode Optical Thermometry of Er³⁺/Yb³⁺ Codoped Lead-Free Double Perovskite Microcrystal