resumo
In this study, stable and nonexpensive aluminoborosilicate glasses with different photoluminescence colors were synthesized by doping with Pb(II), Ba(II) and sodium halides. While glasses with NaF and NaCl exhibit no (or very low) luminescence, glasses doped with NaBr and NaI display room-temperature photoluminescence at 435 and 530 nm, respectively. The observed room-temperature photoluminescence is attributed to nanocrystals whose presence is revealed by transmission electron microscopy. The crystalline nature of the particles, which are pointed out as barium-lead halides, is also revealed by anisotropy measurements for Br and I doped samples. Time-resolved luminescence measurements show a second-order kinetics component combined with a first-order nonradiative rate constant. The photoluminescence properties here described are important for the future design of new optical materials or devices based on lead halide nanocrystals.
palavras-chave
PEROVSKITE SOLAR-CELLS; LEAD HALIDE CRYSTALS; BORATE GLASSES; LUMINESCENT GLASSES; SILICATE-GLASSES; AG NANOCLUSTERS; PBBR2 CRYSTALS; PBCL2; NANOPARTICLES; TEMPERATURE
categoria
Chemistry; Science & Technology - Other Topics; Materials Science
autores
Ruivo, A; Ferro, M; Andrade, SM; Rocha, J; Pina, F; Laia, CAT
nossos autores
João Rocha
Prof. Catedrático
Marta Ascenção Carmona Ferro
Técnico de LaboratórioProjectos
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
From inexpensive raw materials to new luminescent glass materials (InLumGlass)
agradecimentos
This work has been supported by the European project NMP4-SL-2012-310651 under FP7-NMP-2012-SMALL-6 and by Fundacao para a Ciencia e a Tecnologia through PTDC/QEQ-QIN/3007/2014, UID/EAT/00729/2013, UID/QUI/50006/2013, and UID/CTM/50011/2013 cofinanced by the ERDF under the PT2020 Partnership Agreement (POCI-01-0145-FEDER - 007265 and POCI-01-0145-FEDER - 007679). A.R would like to thank FCT for a grant (SFRH/BD/46659/2008).