A new route for the synthesis of P-sialon;;Eu~(2+) phosphors using pyrophyllite powders

摘要

Eu~(2+) ion doped p-sialon (Si_(6-z)Al_zO_zN_(8_z):xEu~(2+)) phosphors were prepared from pyrophyllite-based mixtures by a carbothermal reduction and nitridation method first. Then, the effects of z values and the Eu concentration on the structure and the photoluminescence (PL) properties were investigated. P-Sialon was successfully synthesized as a dominant phase even at the low temperature of 1500 °C, while Si_3N_4 and A1N weakly coexisted as secondary phases. The PL excitation spectra exhibited the broad spectra covering up to 500nm, and the greenish-yellow emission was observed at around 580nm. At z= and x=0.012, excellent emission intensity could be attained.