Production of Phosphor (YAG : Tb) particles by Supercritical Water Crystallization Method

超临界水结晶法生产荧光粉（YAG：Tb）颗粒

• 批准号: 08555184
• 负责人: ARAI Kunio
• 金额: $ 9.73万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555184/
• 关键词: Phosphor; Supercritical Water; YAG : Tb; Hydrothermal Synthesis; Emission property; 蛍光体; YAG : Tb; 熱分析; 反応晶析

The objective of this research was to develop a repid and continuous production process for phosphor (YAG : Tb) fine particles by supercritical water crystallization method. The relationship between properties (crystal sturacture, particle size and particle size distribution) of particles produced and reaction conditions (reaction temperature, pressure, reaction time, composition of solution and alkali mole ration of solution) was investigated experimentally. Al (NO_3) _3, Y (NO_3) _3 and TbCl_3 mixed aqueous solution was used as the starting materials. Potassium aqueous solution was used to vary the alkali mole retio of solution. Experiments were performed with a newly-deveolped flow type apparatus. From these results, the alkali mole ratio was important factor for production of single phase YAG particles. Reaction temperature and pressure affected crystalline size and lattice constant of particles. High temperature and low pressure leaded to produce particles with high crystallinity. Emission properties of particles produced was studied by comparison with particles produced by a conventional solid state reaction method. Properties of particles produced by the method in this work were comparable with the conventional method. Continuous (1.5g/h) and rapid (<1 sec.) production of phosphor (YAG : Tb) fine particles was found to be practical with the supercritical water crystallization method.

本研究的目的是开发一种快速、连续的超临界水结晶法制备荧光粉（YAG：Tb）的工艺。实验研究了反应条件（反应温度、压力、反应时间、溶液组成、溶液碱摩尔比）与产物的晶体结构、粒度及粒度分布的关系。以Al（NO_3）_3、Y（NO_3）_3和TbCl_3的混合水溶液为起始原料，研究了稀土离子对催化剂性能的影响。用钾水溶液改变溶液的碱摩尔比。实验是在新研制的流动式装置上进行的。从这些结果来看，碱摩尔比是产生单相YAG颗粒的重要因素。反应温度和压力影响颗粒的晶粒尺寸和晶格常数。高温、低压有利于制备结晶度高的颗粒。通过与传统的固态反应方法制备的颗粒进行比较，研究了所制备的颗粒的发射特性。本工作中的方法生产的颗粒的性能与常规方法相当。连续（1.5g/h）和快速（<1秒）发现用超临界水结晶法生产磷光体（YAG：Tb）细颗粒是可行的。