CN103045261A - 一种发光材料 - Google Patents

一种发光材料 Download PDF

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Publication number
CN103045261A
CN103045261A CN2012105750433A CN201210575043A CN103045261A CN 103045261 A CN103045261 A CN 103045261A CN 2012105750433 A CN2012105750433 A CN 2012105750433A CN 201210575043 A CN201210575043 A CN 201210575043A CN 103045261 A CN103045261 A CN 103045261A
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China
Prior art keywords
los
luminescent material
conversion
ion
aminosilane
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曲志乾
秦子玲
唐小晨
魏薇
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Qingdao Shengjia Information Technology Co Ltd
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Qingdao Shengjia Information Technology Co Ltd
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Abstract

本发明提供一种发光材料，为二氧化硅/氨基硅烷包覆La202S:Yb3+，Ho3+纳米粒子白光上转换发光粉。

Description

一种发光材料
技术领域
本发明属于发光材料领域，特别涉及一种上转换发光材料。
背景技术
上转换发光材料对基质材料的选取也有很高的要求。尽管通过增大泵浦激光功率，稀土离子在很多材料中都可以实现上转换发光，但是因为相同激活剂离子在不同基质材料中的发光强度差别非常大，最大相差8个数量级，所以为了得到真正满足实际应用的上转换发光材料，必须选择适当的基质材料。前人的大量研究结果表明，理想的上转换发光基质材料应具有与掺杂离子相匹配的晶格。Y3+、La3+、Gd3+、Lu3+由于具有与上述激活剂和敏化剂离子相似的离子半径和化学特性，因而它们的无机化合物大多是合适的上转换发光基质材料。另外，碱土金属离子(Ca2+、Sr2+和Ba2+)和一些过渡金属离子(如Zn2+、Zr4+和Ti4+)也具有与稀土离子相近的离子半径。因此，含有这些离子的无机化合物也常常被用作上转换发光的基质材料。为了使影响上转换效率的非辐射弛豫最小，理想的上转换发光基质材料还应该具有较低的声子能。氟化物、氟氧化物、硫氧化物和部分氧化物含氧酸盐由于声子能较低且化学性质稳定是不错的选择。目前绝大多数的上转换发光材料是以这五类材料为基质的。虽然，氯化物、嗅化物和碘化物具有更低的声子能(小于300cm-1)，或者说可以输出更高效的上转换发光，但易潮解的性质限制了它们的实际应用。因此，到目前为止，相关的研究报导并不多见。另外，理想的基质材料在可见波段应该是光学透明的，这一点对于得到高效的上转换发光也是至关重要的。
发明内容
本发明提供一种发光材料，为二氧化硅/氨基硅烷包覆La202S:Yb3+，Ho3+纳米粒子白光上转换发光粉。
附图说明
图1是LOS和LOS-N1在单一980nmLD泵浦下的上转换光谱。
具体实施方式
本发明根据均匀沉淀法制备产物的特殊生长机制，通过缩短反应的熟化时间成功制备了40nln的良好分散La2O3纳米粒子。典型地，首先按照化学计量比准确地量取一定量的La(N03)3，Yb(N03)3和Ho(N03)3储备液，之后用水稀释到800mL，所得溶液浓度为0.02mol/L。同样地，配备了等体积的尿素水溶液(6M)。将上述溶液混合并加热到83℃熟化9min。随后，快速冷却到室温。经水和乙醇分别洗涤三次后，将所得产物于400℃干燥12h。最后，800℃焙烧lh，得到La203:Yb3+，Ho3+上转换纳米晶(L-Y-H)。
固-气硫化法用于La203:Yb3+，Ho3+的硫化。典型地，在自制的硫化装置中，利用氢气缓慢输送硫蒸气，于800℃对La203:Yb3+，Ho3+进行硫化，硫化反应时间为1h。待反应结束后，迅速冷却硫化装置，并继续通氨气，直至反应装置冷却到室温。所得产物为La202S:Yb3+，Ho3+，记作LOS。
PVP辅助一步氨化法制备二氧化硅/氨基硅烷包覆La202S:Yb3+，Ho3+纳米粒子。PVP辅助一步氨化法用于制备二氧化硅/氨基硅烷包覆单个La202S:Yb3+，Ho3+纳米粒子。典型地，0.06g LOS粉末分散到50ml含PVP(0.3g)、水(5ml)和氨水(4ml)的乙醇中。室温下磁力搅拌该溶液，并将30ml含TEOS(0.04ml)的乙醇溶液加入其中。3h后，加入20ml含APES(0.04ml)的乙醇溶液继续反应lh。以5000rpm离心10min沉降反应混合物，之后分别用乙醇和水洗涤3次收集产物，记作LOS-1。为了比较，之后，离心分离收集产物并重新分散到无水乙醇中。
图1给出了样品在980nmLD泵浦下的上转换光谱。
理想的生物荧光探针不但应是纳米尺寸、良好分散和水溶的，而且应具有良好的发光特性。图1给出了LOS和LOS-1在980nmLD激发下的上转换光谱。很明显，LOS和LOS-1均呈现出强的绿光和微弱的红光，但注意到，与LOS相比，LOS-1呈现更强的绿光和更弱的红光。因为包膜前后发射谱线的峰位和形状保持不变，所以首先可以排除二氧化硅/氨基硅烷包膜对纳米粒子表面掺杂离子的晶场的影响。这是因为如果包膜为表面掺杂离子提供新的晶场，那么包膜后的产物就好比是两种不同材料的混合物，即内部离子掺杂的La2O2S和表面离子掺杂的新材料，结果必定导致发射带的峰位和形状发生一定变化。

Claims (1)

1.一种发光材料，为二氧化硅/氨基硅烷包覆La202S:Yb3+，Ho3+纳米粒子白光上转换发光粉。
CN2012105750433A 2012-12-26 2012-12-26 一种发光材料 Pending CN103045261A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108059953A (zh) * 2017-11-24 2018-05-22 中国林业科学研究院木材工业研究所 一种长余辉发光柔性纳米纤维素材料、制备方法及其应用

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PANG TAO ET AL.: "Preparation and upconversion luminescence of monodisperse Y2O2S:Yb/Ho-silica/aminosilane core-shell nanoparticles", 《JOURNAL OF RARE EARTHS》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108059953A (zh) * 2017-11-24 2018-05-22 中国林业科学研究院木材工业研究所 一种长余辉发光柔性纳米纤维素材料、制备方法及其应用
CN108059953B (zh) * 2017-11-24 2020-05-22 中国林业科学研究院木材工业研究所 一种长余辉发光柔性纳米纤维素材料、制备方法及其应用

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Application publication date: 20130417