【作者】 巨荣玲；

【导师】 崔屾；

【作者基本信息】 天津大学 ， 物理化学， 2007， 硕士

【摘要】 制约场发射显示器（FED）市场化的主要因素之一是目前还没有能全面满足FED使用要求的高性能低压荧光粉。本实验的主要目的是制备FED用低压荧光粉,为加速FED市场化进程作出一定的贡献。本文采用物理处理方法对商品化荧光粉（2号、1号）进行改性,借助SEM、TEM、XRD表征和发射光谱测试考察了真空干燥温度、焙烧温度对其形貌和发光性能的影响。实验结果表明,对于2号商品化稀土荧光粉,随着真空干燥温度的增加,颗粒尺寸明显增加,在1200V激发下的发光强度先增加后降低。当真空干燥温度为200℃时,随着后续焙烧温度的升高,产物分散性得到明显改善、结晶度逐渐增加、在1500V激发下的发光强度逐渐增强;焙烧温度即使升高到1200℃,所得产物仍以纳米颗粒为主（5～85nm）。而真空干燥温度为300℃时,随着后续焙烧温度的升高,虽然荧光粉的结晶度也逐渐增加,但颗粒烧结程度也逐渐增加,热稳定性降低,在1500V激发下的发光强度先增强后降低。对于1号商品化荧光粉,随着真空干燥温度的增加,所得样品颗粒尺寸先减小后增加,分散性先改善后变差,在1200V激发下的发光强度先增加后降低;经一定温度（100℃、200℃或300℃）真空干燥,再经1200℃焙烧后,在1200V、1500V激发下均不发光。本文分别采用固相反应法、化学法制备了ZnGa₂O₄荧光粉。SEM和TEM表征结果显示,采用固相反应法时,若反应物的混合方式不同,则所得产物颗粒的分散性不同;采用化学法时,若ZnO:Ga₂O₃摩尔比不同,则所得产物的颗粒尺寸和形貌各不相同。本文自制荧光粉的涂层,然后对其分别进行了发光性能定性测试。结果表明,2号商品化稀土荧光粉及其经过物理方法处理后的样品均发较强的红光;1号商品化荧光粉发较强的绿光;固相反应法制得的ZnGa 2 O4荧光粉均发一定强度的蓝光;化学法制备的ZnGa₂O₄荧光粉可发较弱的绿光。更多还原

【Abstract】 The lack of low cost low-pressure phosphors with excellent performance is one of the key factors, which restrict the commercialization of FED. The main purpose of this work is to prepare low-pressure phosphors used for FED in order to accelerate the speed of commercialization of the FED.The effects of temperatures of vacuum evaporation and calcination on the morphology and luminescent properties of the commercial phosphor No.2 and No.1 were investigated by SEM, TEM, XRD, and Emission Spectrum measurements. For the commercial phosphor No.2, the results show that the particle sizes increase, the luminescent intensity is enhanced firstly and then depressed with the increase of the evaporation temperature, the exciting voltage is 1200V. The distribution of the particles is improved, the crystallization degree is raised, the luminescent properties are enhanced with the increase of the calcination temperature from 800℃to 1200℃after evaporated at 200℃in vacuum the exciting voltage is 1500V, and the majority of the particle sizes are between 5 nm and 85 nm. But the distribution become bad, the luminescent properties are enhanced firstly and then depressed, the crystallization degree are also raised with the increase of the calcination temperature from 800℃to 1200℃, if the samples are first evaporated at 300℃in vacuum. For the commercial phosphor No.1, the results show that the particle sizes decrease first and then increase, the distribution are improved first and then depressed, the luminescent intensity is enhanced first and then decreased with the increase of the evaporation temperature （the exciting voltage is 1200V）; however, it losts the luminescent property after calcined at 1200℃.ZnGa 2 O4 Phosphors were prepared by chemical method and solid-state mill method, respectively. SEM and TEM were used to characterize the phosphors. The measurements show that the distributions are different if the raw materials are milled in different way. The particle sizes and morphology of the phosphors are different, which prepared by chemical method, if the molar ratio of ZnO:Ga₂O₃ is changed.Phosphor coats were coated by scrape method, and their luminescent properties were characterized qualitatively. The measurements show that the commercial phosphor No.2 is red light emitting, the commercial phosphor No.1 is green light emitting, ZnGa₂O₄ Phosphors are green and blue light emitting, respectively, corresponding to the chemical and solid-state mill preparation method.更多还原