发出绿色光的LaSr2AlO5:Er3+纳米晶体材料用于固态照明:晶相精细化和下转换光发光,具有高热稳定性
Pawan Kumar1, Devender Singh1, Harish Kumar2
1Department of Chemistry, Maharshi Dayanand University Rohtak-124001 Haryana India devjakhar@gmail.com.
RSC advances
|January 4, 2024
概括
这项研究介绍了一种通过凝燃烧合成的新型绿色发射Er3+-dopedLaSr2AlO5. 该材料表现出优异的热稳定性和高颜色纯度,使其适用于固态照明应用.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 发光的光度是非常的低.
背景情况:
- 开发高效的光剂对于先进的固态照明至关重要.
- 在宿主格子中使用埃尔 (Er3+) 可以产生理想的发光特性.
- 作为发光材料的潜在宿主,正在探索LaSr2AlO5.
研究的目的:
- 为了合成和描述一种绿色发射的Er3+合物LaSr2合物AlO5.
- 研究其用于照明应用的结构,光学和热性能.
- 评估其作为固态照明中的绿色组件的潜力.
主要方法:
- 使用尿素作为燃料的凝燃烧合成.
- 通过瑞特维尔德对X射线衍射 (XRD) 数据的结构分析.
- 使用传输电子显微镜 (TEM) 和能量分散X射线 (EDX) 谱学进行形态和元素分析.
- 使用光发光 (PL) 光谱和寿命测量进行光电子表征.
- 取决于温度的PL测量 (298498 K).
主要成果:
- 成功合成了Er3+-doped LaSr2AlO5光,具有向下转换的绿色发光.
- 使用瑞特维尔德精炼来确定晶体结构和相纯度.
- 优化的样本 (La0.96Sr2AlO5:4mol% Er3+) 显示出直径带间隔为5.51 eV.
- 在377nm激发下,在可见范围 (406,520,550,665nm) 中观察到特征性的Er3+排放峰值.
- 由于四极体-四极体相互作用,鉴定了超过4mol%Er3+的度火.
- 证明了高的热稳定性,在498 K.保持74.29%的发光强度.
- 计算了高颜色纯度和有利的色度坐标.
结论:
- 通过凝燃烧合成的Er3+-doped LaSr2AlO5具有有前途的光电子和热性能.
- 该材料的高热稳定性和出色的色彩纯度支持其作为固态照明器件中绿色发射元件的潜在应用.
- 进一步优化可以提高其用于商业照明应用的性能.
相关概念视频
Photoluminescence: Fluorescence and Phosphorescence
2.1K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
2.1K
Photoluminescence: Applications
403
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
403


