NaSr₂Nb₅O₁₅:Yb³⁺, Ho³⁺, Tm³⁺ transparent glass ceramics: Up‐conversion optical thermometry and energy storage property

Abstract

Rare earth tri‐doped precursor glasses (PGs) were prepared by traditional high‐temperature melting method, and NaSr2Nb5O15 transparent glass–ceramic (GC) was obtained by subsequent heat treatment. Results exhibit that the up‐conversion emission intensity of GC is greatly enhanced compared to PG. Benefiting from the multiple emission bands from Ho3+ and Tm3+ and their different temperature dependence, multi‐ratio optical temperature measurement is realized. The ultimate relative sensitivity (Sr‐max) can reach 2.00% K−1 between 298 and 598 K. It provides a possibility for self‐reference temperature measurement. Furthermore, under the actual charging and discharge conditions, the GC heated at 750°C has great energy density (Wd = 1.15 J/cm3@600 kV/cm) and high‐power density (Pd = 290.4 MW/cm3@600 kV/cm) with ultrafast discharge time (<15.8 ns). The previous results indicate that the obtained GC with good multifunctional properties is expected to be applied in the field of photoelectric conversion.

The effects of Sr-substitution in Ba2SmTi2Nb3O15 ceramics: structural study, optical properties, and complex impedance spectroscopy

“…The standard formula for a TTB is (A1) 2 (A2) 4 (C) 4 (B1) 2 (B2) 8 O 30 . [1][2][3][4][5][6] The pentagonal sites (A2) with a coordination number of 15 are capable of accepting sizable cations, including alkaline earth elements. On the other hand, the square sites (A1) with a coordination number of 12 are designed to accommodate moderately sized cations, such as rare earth elements.…”

Phase transition monitoring and temperature sensing via FIR technology in Bi/Sm‐codoped KNN transparent ceramics

“…[1][2][3][4][5] Thereinto, optical temperature sensors via fluorescence intensity ratio (FIR) are rapidly developed, which is not susceptible to external interference in measurement, enriching the temperature measurement technology that holds significant implications on human daily life as well as scientific inquiry. [6][7][8][9] Moreover, FIR optical temperature sensors that exhibit multiple advantages of simple operation, fast response speed and high spatial resolution possess apparent preponderance over traditional temperature measuring technology, conducive to the harsh working environment and remote temperature monitoring applications. [10][11][12][13] Compared with frequently-used matrices in optical temperature sensors, such as toxic fluorides and fragile glasses that own poor thermal stability, lead-free ferroelectric ceramics display nontoxicity, high mechanical strength and excellent chemical stability, behaving more advantages in broader application areas.…”

“…Luminescent materials have gained extensive application prospects in display lighting, anticounterfeiting, optical information storage, temperature sensing, and other fields on account of their particular optical properties 1–5 . Thereinto, optical temperature sensors via fluorescence intensity ratio (FIR) are rapidly developed, which is not susceptible to external interference in measurement, enriching the temperature measurement technology that holds significant implications on human daily life as well as scientific inquiry 6–9 . Moreover, FIR optical temperature sensors that exhibit multiple advantages of simple operation, fast response speed and high spatial resolution possess apparent preponderance over traditional temperature measuring technology, conducive to the harsh working environment and remote temperature monitoring applications 10–13 …”