New Pr3+ site in beta-SiAlON red phosphor
Journal
Optical Materials
Journal Volume
35
Journal Issue
11
Pages
2001-2005
Date Issued
2013
Author(s)
Abstract
Luminescent emission spectra and excitation spectra of Pr 0.016Si5.9Al0.1O0.1N7.9 (β-SiAlON:Pr3+) were measured. Emission upon UV excitation consists of sharp lines peaked between 600 and 630 nm, related to the 1D2→3H4 and 3P 0→3H6 transitions in Pr3+ ion. Two other group of lines peaked between 500 and 530 nm and between 640 and 680 nm are related to the 3P0→3H4 and 3P0→3FJ transitions, respectively. Excitation spectrum of the β-SiAlON:Pr3+ luminescence (observed at 641 nm and at 632 nm) consists of sharp lines in the spectral region 450-500 nm related to the 3H4→ 3P0, 3P1, 3P2 transitions and two broad bands peaked at 280 and 330 nm attributed to ionization of Pr3+. Emission obtained upon excitation at 330 nm band contains additional peaks besides earlier observed upon excitation at 280 nm band and under excitation in the 3H4→ 3P2 absorption region. These additional lines were attributed to the second site of Pr3+ (Wyckoff letter 2a) where Pr3+ ions occupy the interstitial positions of nine-fold coordinated by nitrogen/oxygen ions. © 2012 Elsevier B.V. All rights reserved.
SDGs
Type
journal article