Temperature dependence of narrow-band UVB photoluminescence of silica-(Gd,Pr)PO4transparent glass-ceramic phosphors

Koichi Kajihara; Shingo Nakagawa; Ryosui Nakagawa; Mayu Suda; Masanao Ishijima; Haruo Kuriyama; Izumi Serizawa

doi:10.1088/1361-648X/ad0a12

Temperature dependence of narrow-band UVB photoluminescence of silica-(Gd,Pr)PO₄transparent glass-ceramic phosphors

J Phys Condens Matter. 2023 Nov 16;36(8). doi: 10.1088/1361-648X/ad0a12.

Authors

Koichi Kajihara¹, Shingo Nakagawa¹, Ryosui Nakagawa¹, Mayu Suda¹, Masanao Ishijima¹, Haruo Kuriyama², Izumi Serizawa²

Affiliations

¹ Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan.
² ORC Manufacturing Co. Ltd, 4896 Tamagawa, Chino, Nagano 391-0011, Japan.

PMID: 37931320
DOI: 10.1088/1361-648X/ad0a12

Abstract

The effect of temperature on photoluminescence (PL) due to the⁶P_j→⁸S_7/2(j= 5/2, 7/2) transitions of Gd³⁺ions was examined between 200 and 500 K for a sol-gel-derived silica-(Gd,Pr)PO₄transparent glass-ceramic phosphor with negligible concentration quenching under excitation into the 5d-4f transition of Pr³⁺ions at 220 nm. The intensity of the narrow-band ultraviolet B (UVB) PL at ∼313 nm associated with the⁶P_7/2→⁸S_7/2transition slightly increased between 200 and 300 K, but was decreased to ∼86% and ∼62% of that at 300 K when temperature was raised to 400 and 500 K, respectively. The observed magnitude of the thermal quenching of the UVB PL intensity was agreed well with that recorded in a prototype narrow-band UVB lamp consisting of another silica-(Gd,Pr)PO₄transparent glass-ceramic window and a KrCl excimer lamp as a light source at 222 nm. The silica-(Gd,Pr)PO₄transparent glass-ceramics was more resistant to the thermal quenching of the narrow-band UVB PL than a conventional powder phosphor, probably because of the encapsulation of (Gd,Pr)PO₄nanocrystals with low quenching centre concentrations in inert silica glass matrix.

Keywords: (Gd Pr)PO4 nanocrystals; narrow-band ultraviolet B photoluminescence; silica glass; temperature dependence; transparent glass-ceramics.