resumo
Novel Al3+-incorporated Ca2LuNbO6:Mn4+ oxide phosphors with a double-perovskite structure were successfully prepared by a high-temperature solid state reaction. Excited with 355 nm ultraviolet light, the Ca2LuNbO6:Mn4+ samples mainly showed a weak deep-red emission band around 625-725 nm with a peak at 685 nm. After the incorporation of a certain amount of Al3+, not only the deep-red emission band was continuously enhanced, but also a new far-red emission band around 680-780 nm with a peak at 710 nm was clearly observed. A further increase of the Al3+ content resulted in a dramatic enhancement of both the deep-red and far-red emission bands. The luminescence quantum yield of the optimal Ca2LuNb0.6Al0.4O6 : 0.3%Mn4+ sample reached about 34%, which was much higher than that without Al3+ (<10%). Moreover, temperature-dependent luminescence measurement demonstrated good thermal stability, making it applicable to phosphor-converted light-emitting diodes. The dramatically enhanced red emission and a broadened spectral region matched well with the absorbance range of photosensitive pigments, showing significant potential for application in plant cultivation lighting.
palavras-chave
PHOTOLUMINESCENCE PROPERTIES; MN4+ PHOSPHORS; LUMINESCENCE PROPERTIES; EFFICIENCY; TRANSITION; PLANTS
categoria
Materials Science; Physics
autores
Wu, JY; Yin, ZQ; Shi, SK; Fu, LS
nossos autores
Lianshe Fu
Investigador AuxiliarProjectos
Nano-argilas para remoção/captura de fosfatos (P) e sua reutilização como fertilizante (NATURAL)
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work was financially supported by the Natural Science Foundation of China (51972097) and Science Foundation of Hebei Normal University, China (L2019K11). The authors would like to thank Prof. Xu Li from Hebei University for preparation of pc-LED devices and electroluminescence measurements. This work was also developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 and LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC).