采用高温固相法合成了Sr:ZnMoO6:Sm3+新型红色荧光材料,并对其发光特性进行了研究。XRD测量结果表明所制备样品为纯相Sr2ZnMoO6晶体。样品的发射光谱由一系列锐谱组成。分别位于563nm(4G5/2→H5/2)、598nm(4G5/2→H7/2)、607nm(4G5/2—6H7/2)和645nm(4G5/21±H9/2),最强发射为645nm。样品激发光谱由电荷迁移带CT和Sm3+离子的特征激发峰组成,主激发峰位于284nm(CT)和403nm(6H54L13/2)。随着Sm3+浓度的增大,Sr2-xZnMoO6:xSm3+材料的发光强度先增大后减小,在x≥2%时。发生浓度猝灭现象。根据Dexter理论分析其猝灭机理为电偶极.电偶极相互作用。比较了Li+、Na+和K+作为电荷补偿剂的作用,发现均使Sr2ZnMoO6:Sm3+材料的发射强度得到增强,但以Li+补偿效果最为显著。
A novel red Sr2ZnMoO6: Sm3+ phosphor was prepared by solid state reaction method, and its luminescence properties were studied. The X-ray diffraction patterns (XRD) showed that a pure Sr2ZnMoO6 phase phosphor was obtained after sintered at 1 250℃. The emission spectrum of the Sr2ZnMoO6: Sm3+ phosphor was characterized, which peaked at 563, 598, 607, 645 nm, corre- sponding to the 4Gs/2→6Hs/2, 4Gs/2→6H7/2 and 4Gs/2→6H9/2 transitions of Sm3+ , respectively. The strongest one appears at 645 nm. The excitation spectrum consisted of charge transfer band (284 nm) and characteristic transition (403 nm). The concentration quenching could be observed when x was more than 2% , and it was confirmed that the mechanism of concentration quenching was electric dipole-dipole interaction by Dexter theory. Under the condition of doping charge compensation of Li + , Na + and K + , the emission intensity of Sr2ZnMoO6: Sm3 + was improved, and it was found that Li+ ions gave the best boost. These Sr2ZnMoO6: Sm3+ phosphors may be potentially used as red phosphors for white light-emitting diodes.