Effect of annealing conditions on the luminescence properties and thermometric performance of SrAlOCl:Eu and SrAlO:Eu phosphors.

We report on the synthesis, photoluminescence optimization and thermometric properties of SrAlOCl:Eu and SrAlO:Eu phosphor powders. The photoluminescence of SrAlOCl:0.1Eu phosphors exhibits a blue-shift with an increasing annealing temperature owing to a decrease in the crystal field strength of the host caused by evaporation of Cl from the material.

High-resolution velocimetry technique based on the decaying streaks of phosphor particles.

This Letter introduces a new, to the best of our knowledge, particle streak velocimetry technique based on decaying streaks formed by individual phosphor particles following pulsed excitation. Tin-doped phosphor particles are dispersed into flows and excited by a pulsed UV laser light sheet. Emission streaks are recorded as a result of particle motion during the persistence of luminescence (here ∼27µ).

Thermochromic Luminescent Nanomaterials Based on Mn/Tb Codoping for Temperature Imaging with Digital Cameras.

A new thermographic nanocrystalline SrAlO:Mn,Tb phosphor was developed, and the concentrations of both dopants and the synthesis conditions were optimized. The combination of the thermally quenched luminescence from the Mn ions to the almost temperature-independent emission from Tb provides a sensitive luminescent thermometer ( = 2.8%/°C at 150 °C) with strong emission color variability.

ScVO:Bi thermographic phosphor particles for fluid temperature imaging with sub-°C precision.

We synthesized and characterized : thermographic phosphor particles and demonstrated their use as a tracer for temperature imaging in a near-ambient temperature liquid flow using a single laser/camera luminescence lifetime dual-frame ratio-based method. Owing to a high temperature sensitivity of up to 6%/°C, the single-shot single-pixel temperature precision at a 400 µm spatial resolution is better than ±0.4 (1) across the 20 to 60°C range, representing a factor >5 improvement compared to previous works using thermographic phosphors.