| 초록 |
Silicate phosphor is known as an excellent luminescence under excitation of near-ultraviolet (NUV) or blue light. In this work, Eu2+-doped M3SiO3 (M=Ba, Sr) phosphor particles were prepared by spray pyrolysis and their luminescent properties were investigated with changing the Eu2+ content, reducing temperature, and Ba/Sr ratio. In the case of Sr3SiO4:Eu2+ phosphor, the prepared particles had the crystal phase of not pure Sr3SiO5 but Sr2SiO5, irrespective of the reduction temperature. As a result, the nm emission peak was observed at 542 ~ 552 nm for all Sr3SiO4:Eu2+ samples. In the case of Ba3SiO5:Eu2+ phosphor, the major phase was Ba3SiO5 when the reduction temperature was over 1150 oC and Ba2SiO4 phase was formed as a minor phase. As a result, the two emissions at ca. 509 and 580 nm appeared. The 580 nm emission became dominant over 1300 oC. For the case of (Sr/Ba)3SiO5:Eu2+ phosphor, three characteristic peaks for Ba2SiO4, Sr2SiO4, and Ba3SiO5 were observed, depending on the Sr/Ba ratio. All prepared phosphor showed a good excitation property in the wavelength range from 375 to 480 nm, which means that the M3SiO5:Eu2+ could successfully work under the excitation of blue LED. |
