中文摘要：

为了得到发光效率较好的长波长红色荧光粉,采用 高温固相法成功地合成了适合紫外激发的红色荧光粉 Ca0.5－xSr0.5MoO4：xSm^3＋,研究了其晶体结构和发 光性质。X射线衍射（XRD）测量结果显示,制备的样品为纯相Ca0.5Sr0.5MoO4晶体。其激发 光谱包括一个宽带峰和一系列尖峰,通过不同波长激发的发射谱和与Ca0. 5－xSr0.5MoO4：xEu^3＋的发射 谱比较分析得出激 发宽带为最有效激发带,归属于Mo6^＋－O2－的电荷迁移跃迁。在275nm的激发 下,发射峰由峰值为564nm（^4G5/2→^6H5/2）、 606nm（^4G5/2→^6H7/2） 、647nm （^4G5/2→^6H9/2）、707nm（^4G5/2→^6H11/2）的4个峰组成,最大发射 峰位于647nm处,呈现红光 发射。Sm^3＋掺杂高于6%时Ca0.5－xSr0.5Mo O4：xSm^3＋出现浓度猝灭,分析表明,其猝灭机 理是最邻近离子间的能量传递。同时,添加电荷补偿剂可增强材料的发射强度,以添加Na^＋的效果最明显。

英文摘要：

In order to obtain a long-wavelength red phosphor,the phosphor Ca 0.5-xSr0.5MoO4：xSm^3＋ un der the UV excitation was synthesized by solid state reaction in our work.The luminescent properties and crystal structure are studied.X-ray diffraction （XRD） results show that the crystal phases of these samples agrees well w ith the crystal phase of host Ca0.5Sr0.5MoO4.Its excitation spectrum has a broad band and several sharp peaks.Through the analys is of the emission under different excitation wavelength and the cooperation with Ca0.5Sr0.5MoO4：Eu^3＋,we could conclude t hat the broad band is the most effective excitation band,which can be attributed to Mo6＋-O2- charge transfer transition.Under the exc itation of 275nm,the emission spectra of the Ca0.5-xSr0.5MoO4：xSm^3＋ phosphors are composed of four major emi ssion peaks centered at 564nm（^4G5/2→^6H5/2）, 606nm（^4G5/2→^6H7/2）,647nm（^4G5/2→^6H9/2） and 707nm（^4G5/2→^6H11/2）,and the strongest peak appears at 647nm as red emission.The concentration q uenching happens when the concentration of Sm^3＋ is 6%.Analysis shows that the concentration quenching mechanism is the energy transition among the nearest neighbor ions.At the same time,the charge compensator,such as Li^＋,Na^＋,K^＋ and Cl- can en hance the emission intensity of the Ca0.5-xSr 0.5MoO4：xSm^3＋ phosphors,and the doping Na^ ＋ charge compensator has the most obvious effect.