论文部分内容阅读
分别以晶态和非晶态SiO2为硅源,在高压釜中采用水热法合成Zn2SiO4:Mn荧光粉,并对其晶体结构、形貌、光吸收及光致发光性能进行表征.结果表明,在220℃下反应6d,以晶态SiO2合成的Zn2SiO4:Mn纳米颗粒呈六棱柱状,具有单晶结构,颗粒长约5～8μm,平均直径约1μm;以非晶SiO2合成的Zn2SiO4:Mn纳米颗粒呈多晶结构,平均长约500nm,平均直径约100nm.2种硅源所制样品在250nm以下的紫外光区具有强吸收,且非晶SiO2所制样品在250～350nm具有良好的紫外光吸收能力.以不同硅源低温制备的Zn2SiO4:Mn样品在波长215和250nm的紫外光激发下均能产生520nm的绿色荧光,且在相同反应时间下非晶硅源制备的样品发光较强.
The crystal structure, morphology, optical absorption and photoluminescence properties of Zn2SiO4: Mn phosphor were characterized by hydrothermal method in the autoclave with crystalline and amorphous SiO2 as the silicon source respectively. Zn2SiO4: Mn nano-particles synthesized in the crystalline SiO2 have a hexagonal columnar structure with a single crystal structure, the length of the particles is about 5 to 8 μm and the average diameter is about 1 μm; the synthesized Zn2SiO4: Mn nano-particles The particles have a polycrystalline structure with an average length of about 500 nm and an average diameter of about 100 nm. The samples prepared from two kinds of silicon sources have strong absorption in the ultraviolet region below 250 nm and the samples made from amorphous SiO2 have good UV at 250 to 350 nm Absorption ability.The Zn2SiO4: Mn samples prepared from different silicon sources at low temperature can produce 520nm green fluorescence under the excitation of 215 and 250nm UV light, respectively, and the samples prepared from amorphous silicon source emit more light at the same reaction time.