CN111285685A - 一种具有核壳结构的激光照明用荧光陶瓷及其制备方法 - Google Patents
一种具有核壳结构的激光照明用荧光陶瓷及其制备方法 Download PDFInfo
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Abstract
本发明公开用于一种具有核壳结构的激光照明用荧光陶瓷及其制备方法，包含有，陶瓷内核部，其化学组成为：(CexY1‑x)3Al5O12，其中，x的取值范围为：0.001≤x≤0.03；以及，覆盖于所述陶瓷内核部上的陶瓷外壳部，其化学组成为：(EuyY1‑y)3Al5O12，其中，y的取值范围为：0.0005≤y≤0.04。本发明的有益效果在于：有效地解决当前激光照明产品中由于蓝光分部不均匀导致光斑颜色不均匀、使用YAG：Ce荧光材料红光成分不足导致的色温高显色性低等问题问题。同时该结构荧光陶瓷结构简单且具有良好的温度淬灭性能。
Description
技术领域
本发明涉及激光照明用荧光材料领域，特别地是，一种具有核壳结构的激光照明用荧光陶瓷及其制备方法。
背景技术
白光激光照明是指以半导体激光器为核心光源，采用激光激发荧光体或纯激光混光等技术，产生高亮白光照明。激光因为具有方向性强、光亮度高等特点，在照明领域尤其是大功率照明领域得到了越来越多的应用，目前较为成熟的是采用蓝光激光激发黄色荧光体合成白光，但是使用此种方式得到的白光光谱中缺少红光成分，因此其色温较高，显色指数较低。此外，由于激光的发光角极窄，由蓝光激光芯片作为激发光源的激光照明产品通常会产生光斑中间区域与边缘区域色温不一致的现象。
荧光陶瓷和LED芯片为360°发光，其发光特性近似朗伯体发光，在空间中光强分布较为均匀，在使用蓝光LED作为激发光源时蓝光与荧光体发出的黄光发光角与光强分布较为一致，因此可以得到相对均匀的白光光斑。激光光源相比于LED光源具有极窄的发光角，在使用蓝光激光作为激发光源时蓝光发光角和光强分布集中，荧光体发出的黄光发光角与光强分布分散。导致光斑中心区域“白”，周围区域“黄”。
发明内容
人们一直期望解决现有技术中激发的黄光和经过陶瓷内部反射出的蓝光复合成白光，复配出的光呈现中间白周围黄的现象，但始终未能获得成功。本发明提供一种具有核壳结构的激光照明用荧光陶瓷及其制备方法，能有效缓解周围区域偏黄的问题，从而复配出均匀的白光。
本发明的技术方案是这样实现的：一种具有核壳结构的激光照明用荧光陶瓷，包含有，
陶瓷内核部，其化学组成为：(CexY1-x)3Al5O12，其中，x的取值范围为：0.001 ≤x≤0.03；以及，
覆盖于所述陶瓷内核部上的陶瓷外壳部，其化学组成为：(EuyY1-y)3Al5O12，其中，y的取值范围为：0.0005≤y≤0.04。
作为一种具有核壳结构的激光照明用荧光陶瓷的优选方案，所述陶瓷内核部为半球体，所述陶瓷外壳部为碗体。
本发明还提供一种具有核壳结构的激光照明用荧光陶瓷的制备方法，用于制备激光照明用荧光陶瓷，包含有以下步骤，
步骤S1，以CeO2、Y2O3、Al2O3、Eu2O3为原料，按所述陶瓷外壳部的化学组成(EuyY1-y)3Al5O12及所述陶瓷内核部的化学组成(CexY1-x)3Al5O12配置所述陶瓷外壳部的粉体原料及所述陶瓷内核部的粉体原料，其中，x的取值范围为：0.001≤x ≤0.03，y的取值范围为：0.0005≤y≤0.04；
步骤S2，使用湿法球磨，以无水乙醇作为分散介质，球磨6-20h，球磨结束后加入一定量的氨水，调节pH值至9，然后继续球磨10-30min混合均匀，形成所述陶瓷外壳部的浆料及所述陶瓷内核部的浆料；
步骤S3，将所述陶瓷外壳部的浆料及所述陶瓷内核部的浆料分别注入碗形及半球形石膏模具中，干燥24-72h，脱模后形成所述陶瓷外壳部的素坯及所述陶瓷内核部的素坯；
步骤S4，将所述陶瓷外壳部的素坯及所述陶瓷内核部的素坯组合，施以 150-250MPa冷等静压，形成陶瓷素坯；
步骤S5，将陶瓷素坯放入真空烧结炉1500-1800℃，4-20h保温后，经退火得到荧光陶瓷；
步骤S6，减薄或抛光。
与现有技术相比，本发明的有益效果至少在于：有效地解决当前激光照明产品中由于蓝光分部不均匀导致光斑颜色不均匀、使用YAG：Ce荧光材料红光成分不足导致的色温高显色性低等问题问题。同时该结构荧光陶瓷结构简单且具有良好的温度淬灭性能。
附图说明
图1为本发明的结构示意图。
具体实施方式
下面通过具体的实施方式结合附图对本发明作进一步详细说明。
实施例1：
本实施例中荧光陶瓷的具体制备方法为：
选定的外层荧光陶瓷化学组成为：(Eu0.001Y0.999)3Al5O12，内层荧光陶瓷化学组成为：(Ce0.001Y0.999)3Al5O12，按照其化学计量比称取CeO2、Y2O3、Al2O3、Eu2O3粉体原料，分别以无水乙醇作为介质，湿法球磨10h后加入氨水调节pH值至9。
分别将外层荧光陶瓷浆料和内层荧光陶瓷浆料注入环形和半球形石膏模具中低温下干燥48h，脱模后将内外层素坯组合后施以150MPa冷等静压，保压 3min。
将冷等后的素坯放在马弗炉中800℃保温2h以去除素坯中残存的有机物。
将素坯放在真空烧结炉中1650℃保温4h后得到荧光陶瓷。
将荧光陶瓷放在马弗炉1400℃保温2h以去除烧结过程中产生的氧空位，最终得到外层2厚度0.2mm，内层1厚度0.3mm，底面直径35mm的荧光陶瓷，见图1。
有效地解决当前激光照明产品中由于蓝光分部不均匀导致光斑颜色不均匀、使用YAG：Ce荧光材料红光成分不足导致的色温高显色性低等问题问题。同时该结构荧光陶瓷结构简单且具有良好的温度淬灭性能。
实施例2：
本实施例荧光陶瓷的制备方法与实施例一相同，不同点在于：本实施例选定的外层荧光陶瓷化学组成为：(Eu0.003Y0.997)3Al5O12，内层荧光陶瓷化学组成为： (Ce0.002Y0.998)3Al5O12。
以上仅表达了本发明的实施方式，其描述较为具体和详细，但且不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。
Claims (4)
1.一种具有核壳结构的激光照明用荧光陶瓷，其特征在于，包含有，
陶瓷内核部，其化学组成为：(CexY1-x)3Al5O12，其中，x的取值范围为：0.001≤x≤0.03；以及，
覆盖于所述陶瓷内核部上的陶瓷外壳部，其化学组成为：(EuyY1-y)3Al5O12，其中，y的取值范围为：0.0005≤y≤0.04。
2.根据权利要求1所述的一种具有核壳结构的激光照明用荧光陶瓷，其特征在于，所述陶瓷内核部为半球体，所述陶瓷外壳部为碗体。
3.一种具有核壳结构的激光照明用荧光陶瓷的制备方法，用于制备权利要求1或2所述的激光照明用荧光陶瓷，其特征在于，包含有以下步骤，
步骤S1，以CeO2、Y2O3、Al2O3、Eu2O3为原料，按所述陶瓷外壳部的化学组成(EuyY1-y)3Al5O12及所述陶瓷内核部的化学组成(CexY1-x)3Al5O12配置所述陶瓷外壳部的粉体原料及所述陶瓷内核部的粉体原料，其中，x的取值范围为：0.001≤x≤0.03，y的取值范围为：0.0005≤y≤0.04；
步骤S2，使用湿法球磨，以无水乙醇作为分散介质，球磨6-20h，球磨结束后加入一定量的氨水，调节pH值至9，然后继续球磨10-30min混合均匀，形成所述陶瓷外壳部的浆料及所述陶瓷内核部的浆料；
步骤S3，将所述陶瓷外壳部的浆料及所述陶瓷内核部的浆料分别注入碗形及半球形石膏模具中，干燥24-72h，脱模后形成所述陶瓷外壳部的素坯及所述陶瓷内核部的素坯；
步骤S4，将所述陶瓷外壳部的素坯及所述陶瓷内核部的素坯组合，施以150-250MPa冷等静压，形成陶瓷素坯；
步骤S5，将陶瓷素坯放入真空烧结炉1500-1800℃，4-20h保温后，经退火得到荧光陶瓷。
4.根据权利要求3所述的一种具有核壳结构的激光照明用荧光陶瓷的制备方法，其特征在于，还包含有，
步骤S6，减薄或抛光。
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