Surpassing the sensitivity limit and thermal quenching barrier in NIR luminescent thermometry in monazite BiPO4 concentrated with Nd
Abstract
Non-contact thermometry in the near infrared (NIR) region could enable minimally invasive thermal mapping in biological applications. Yet, existing probes often face trade-offs among sensitivity, brightness, and thermal stability. Here, we developed a single-ion Nd3+-based NIR thermometer, Bi1-xNdxPO4 (x = 0.20-0.40), via integrating several key structure-property considerations. The optimized composition Bi0.70Nd0.30PO4 in monazite structure , synthesized by a high-temperature solid-state reaction, delivers an ultra-high relative sensitivity of 6.62 %K-1 with temperature resolution of 0.29 K at 313 K, while exhibiting no measurable thermal quenching up to 673 K. Remarkably, its NIR-I emission is detectable even under an excitation power as low as 30 μW, highlighting efficient emission at ultra-low excitation. By integrating high sensitivity, thermal robustness, and low-power operation into a single Nd3+-emitting platform, this work establishes a materials design route toward practical NIR thermometry for biological and other demanding environments.
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BibTeX
@misc{singh2026surpassing,
title = {{Surpassing the sensitivity limit and thermal quenching barrier in NIR luminescent thermometry in monazite BiPO4 concentrated with Nd}},
author = {Inderjeet Singh and Rajamani Nagarajan},
howpublished = {ChemRxiv},
year = {2026},
month = oct,
doi = {10.26434/chemrxiv.15010008/v1},
url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010008/v1},
note = {CC BY},
}
RIS
TY - UNPB
TI - Surpassing the sensitivity limit and thermal quenching barrier in NIR luminescent thermometry in monazite BiPO4 concentrated with Nd
AU - Inderjeet Singh
AU - Rajamani Nagarajan
PY - 2026
DA - 2026/10/06
PB - ChemRxiv
DO - 10.26434/chemrxiv.15010008/v1
UR - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010008/v1
AB - Non-contact thermometry in the near infrared (NIR) region could enable minimally invasive thermal mapping in biological applications. Yet, existing probes often face trade-offs among sensitivity, brightness, and thermal stability. Here, we developed a single-ion Nd3+-based NIR thermometer, Bi1-xNdxPO4 (x = 0.20-0.40), via integrating several key structure-property considerations. The optimized composition Bi0.70Nd0.30PO4 in monazite structure , synthesized by a high-temperature solid-state reaction, delivers an ultra-high relative sensitivity of 6.62 %K-1 with temperature resolution of 0.29 K at 313 K, while exhibiting no measurable thermal quenching up to 673 K. Remarkably, its NIR-I emission is detectable even under an excitation power as low as 30 μW, highlighting efficient emission at ultra-low excitation. By integrating high sensitivity, thermal robustness, and low-power operation into a single Nd3+-emitting platform, this work establishes a materials design route toward practical NIR thermometry for biological and other demanding environments.
ER -