BaSi2O2N2:Eu2+,Mn2+phosphor was prepared by a heterogeneous precipitation method. The crystal structure,particle morphology,and luminescent properties of the prepared phosphors were investigated by photoluminescence spectroscopy(PL),scanning electron microscopy(SEM) and X-ray diffraction(XRD). The results show that PL spectra exhibit the broad-band characteristic of Eu2+d-f transition,with emission spectra peaks at 490 nm and excitation spectra covering 370～470 nm,matching near-ultraviolet and blue LED chips. The doping of Mn2+did not alter the crystal structure and spectral shape of BaSi2O2N2:Eu2+phosphor,but the luminescence intensity was clearly enhanced. When the doped concentration of Mn2+was 0.02,the PL intensity increased by 46％. The surface morphology of the prepared phosphor was irregularly shaped. The crystallographic site of Eu2+in BaSi2O2N2:Eu2+was discussed by utilizing the UITERT empirical formula,and the calculated theoretical value of 489 nm is consistent with the experimental observed value of 490 nm.
关键词
氮(氧)化物/稀土掺杂/固相反应法/晶体学格位
Key words
Nitrogen(Oxygen) Compounds/Rare-earth doping/Solid-state reaction/Crystallographic lattice site
万方数据