1 昆明理工大学材料科学与工程学院，云南 昆明 650093
2 云南省新材料制备与加工重点实验室，云南 昆明 650093
近红外光写入的光激励发光材料不仅能推进光激励发光材料在信息存储领域的实用化进程，也能在生物成像和编码方面发挥独到的作用。然而，近红外光写入型的高容量光激励发光材料仍旧十分缺乏。首先以具有热辅助紫外光激发增值填充容量的BaSi2O5∶Eu2+，Nd3+材料作为基础，进一步掺杂Yb3+离子实现近红外光的热转化，然后复合含有蓝、紫光发射的NaYF4∶Yb3+，Tm3+上转换发光材料，成功展示了980 nm激光调控的强度复用光存储。本研究不仅提供了一种高效的近红外光写入型的光激励信息存储材料，还表明了基于热辅助光激励发光材料构建高效近红外光写入的高简效性。
光激励发光材料 近红外光写入 热辅助激发 信息存储 激光与光电子学进展
2024, 61(1): 0116005
1 昆明理工大学材料科学与工程学院, 云南省新材料制备与加工重点实验室, 昆明 650093
2 云南阿飞皮纳科技有限公司, 昆明 650093
3 成都大学机械工程学院, 高等研究院, 先进材料多尺度变形及破坏力学研究所, 成都 610106
闪烁体是X射线成像技术中的核心器件, 它能将吸收的高能射线(X射线或其他高能带电粒子)转化为可见光, 已被广泛应用于医疗诊断、辐射剂量测定和安全检查等领域。目前大多数的商用闪烁体为单晶或薄膜材料, 不仅制备工艺复杂、生长周期长、成本高, 并且辐照稳定性差, 成像效果不佳。通过在透明玻璃基体内原位析出ZnS量子点, 探索ZnS量子点微晶玻璃(GC)作为一种成本低、耐候性强的闪烁体在X射线间接成像领域的应用。实验结果表明, 在X射线辐照下ZnS GC的发射峰位于518 nm, 并利用X成像系统对鱼骨骼和芯片进行成像, 由于ZnS量子点在玻璃基体中的均匀分布, 结果显示图像轮廓清晰、物体内部结构分明, 并且成像分辨率达到18.0 lp/mm。此外, 在累积剂量高达288 J/kg的情况下, 损坏的ZnS GC闪烁体可通过简单的热处理完全恢复成像性能。ZnS GC作为闪烁体在高分辨X射线成像领域表现出广泛的应用前景。
硫化锌量子点 微晶玻璃 X射线成像 透明闪烁体 高剂量可恢复 zinc sulfide quantum dot glass-ceramics X-ray imaging transparent scintillators high-dose recoverable
1 昆明理工大学材料科学与工程学院, 昆明 650093
2 云南省新材料制备与加工重点实验室, 昆明 650033
CsPbX3 (X=Cl, Br, I)量子点微晶玻璃集CsPbX3量子点出众的光学性能和玻璃良好的物化性能于一体, 在光学数据存储、随机激光、X射线成像、照明显示、太阳能电池、光催化等领域有重要应用价值。本文概述了其制备加工以及相对应的性能应用的最新进展, 如利用飞秒激光加工在玻璃中指定区域析出CsPbX3用作光学数据存储, 以此刻画其组成-结构-性能之间关系与变化规律。不过, 其在未来的研究中仍面临诸多挑战, 如CsPbX3在玻璃基质中的原位生长机理并不完全清楚, 对CsPbX3前驱体在“玻璃微反应器”中的赋存状态、近邻结构和分布形态的研究将有助于进一步认识CsPbX3在玻璃中的形成机理, 为获得光学性能更好的CsPbX3量子点微晶玻璃提供理论指导。
量子点 微晶玻璃 玻璃体系 玻璃网络 拓扑结构 钙钛矿 析晶 光学数据存储 quantum dot glass-ceramic glass glass network topology perovskite crystallization optical data storage
1 昆明理工大学 材料科学与工程学院, 昆明 650093
2 楚雄师范学院 物理与电子科学学院, 楚雄 675000
由于热耦合能级(TCLs)差的影响, 传统稀土上转换(UC)光学温度传感技术的灵敏度受到了极大限制, 探索超灵敏温度特性上转换发光材料具有重要的理论和技术价值。本工作研究了1550 nm激光激发下Er 3+单掺BiOCl的上转换发光及温度传感性能。在近红外激发下, BiOCl:Er 3+展现出强烈的670 nm红光发射、弱的525和542 nm绿光发射、微弱的406 nm紫光发射以及983 nm 近红外发光。该上转换材料体系的红绿光发射表现出强烈的温度依赖性, 在300~563 K温度范围内, 4F9/2/ 4S3/2非热耦合能级绝对灵敏度(SA)达到95.3×10 -3 K -1, 是 2H11/2/ 4S3/2热耦合能级的22倍; 同时相对灵敏度(SR)达到了1.19% K -1。1550 nm激发下BiOCl:Er 3+的强烈红色上转换发光和高灵敏温度传感特性在显示及光学温度传感方面具有良好的应用前景。
上转换发光 温度传感 BiOCl 1550 nm激发层 upconversion luminescence temperature sensing BiOCl 1550 nm excitation
1 昆明理工大学材料科学与工程学院, 云南 昆明 650093
2 香港理工大学应用物理系, 香港 999077
3 云南省能源研究院有限公司, 云南 昆明 650093
上转换激光具有反斯托克斯位移、单色性、较高的稳定性等特点使其在医学、投影仪、数据存储、激光头灯、激光提示器可见光通讯、显微镜以及新一代显示技术等众多领域有广泛的应用,因此受到了广泛关注。近年来,这一研究方向的基础研究和应用探索取得了长足的进步,但仍存在一些问题和瓶颈。本文主要综述了稀土掺杂氟化物多波段上转换激光的研究现状,围绕不同发射波段和不同泵浦光源两个方面,重点综述了这一研究领域近年来的进展,并对当前研究中存在的问题进行了总结和对未来发展前景进行了展望。
激光光学 上转换激光 多波段 稀土掺杂氟化物 激光与光电子学进展
2020, 57(7): 071601
Author Affiliations
Abstract
1 College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
2 Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji 721016, China
3 Key Laboratory of Advanced Materials of Yunnan Province, Kunming 650093, China
A series of
Ce3+,
Sm3+-doped
Zn2GeO4 phosphors are prepared by the solid-state reaction. A blue photoluminescence (PL) of
Zn2GeO4 is observed as the recombination of the electrons trapped on
VO and
Zni with holes trapped on
VGe and
VZn′. The energy transfer process between
Ce3+ and
Sm3+ is confirmed by the PL spectra and decay curves, and the emission colors can be adjusted from blue to orange–red. Furthermore, we verify unambiguously that the energy transfer from
Ce3+ to
Sm3+ occurs. Besides,
Ce3+160.0160 Materials 230.0230 Optical devices Chinese Optics Letters
2017, 15(8): 081601
Author Affiliations
Abstract
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
We study the influence of alkali oxides on the near-infrared (NIR)-emitting thermal stability of Bi-doped R2O–SiO2–B2O3–Al2O3 (R = Li, Na, K) glasses below Tg. Results show that undergoing heat treatment, re-markable luminescence quenching occurs for the glasses containing Na2O and K2O due to the formation of Bi metallic colloids, whereas the glass with Li2O shows much better thermal stability. These changes can be understood by the tendency of modifier cations with lower mobility and higher tightness network to restrain the transport of Bi-related NIR-emitting centers. The results provide a scientific reference for composition design of Bi-doped optical fiber.
160.2540 Fluorescent and luminescent materials 160.4760 Optical properties 060.2390 Fiber optics, infrared 160.2750 Glass and other amorphous materials Chinese Optics Letters
2014, 12(11): 111601
Author Affiliations
Abstract
1 College of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
2 Key Laboratory of Advanced Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China
A series of Ca4.99(PO4)3F:1%Eu3+, 1%X (X = Li+, Au3+, and Bi3+) nanoparticles are prepared using hydro-thermal method, with an average size of 33–62 nm. We study the improved photoluminescence properties of Ca4.99(PO4)3F:1%Eu3+ by co-doping with Li+, Au3+, and Bi3+ ions, respectively, and the enhancement of the emission intensities of Eu3+ is observed in these samples. The effects of Li+ acting as a charge compensator, Au3+ as a plasma surface sensitizer, and Bi3+ as an energy conversion agent are discussed. The results show Ca4.99(PO4)3F:1%Eu3+, 1%X nanoparticles are a promising candidate as a red component for near-ultraviolet light-emitting diodes.
160.0160 Materials 230.0230 Optical devices 300.0300 Spectroscopy Chinese Optics Letters
2014, 12(10): 101602
Author Affiliations
Abstract
We synthesize continuous solid solutions with monophasic zircon-type structure of vanadates of formula YxBi0.95-xVO4:0.05Dy3+ (x = 0–0.95) using a combined method of co-precipitation and hydrothermal synthesis. The X-ray diffractometer patterns confirm the formation of a solid solution of YxBi0.95-xVO4:0.05Dy3+, and the results show that all the samples have monophasic zircon-type structure. The absorption spectra of the prepared phosphors show a blue-shift of the fundamental absorption band edge with increasing Y3+ content. An intense tunable characteristic emission of Dy3+ is observed with the increasing ratio of Y/Bi. Finally, the mechanism of luminescence of Dy3+ in the YxBi0.95-xVO4:0.05Dy3+ (x = 0–0.95) solid solution is analyzed and discussed.
160.0160 Materials 230.0230 Optical devices 300.0300 Spectroscopy Chinese Optics Letters
2014, 12(9): 091601
Author Affiliations
Abstract
The influence of silver nanoparticles on Er3+ up-conversion in CaF2 precipitated oxyfluoride glass-ceramics is investigated. After heat-treatments, transmission electron microscopy images show that CaF2 nanocrystals precipitate in the glass matrix uniformity, and sliver nanoparticles are spread around the CaF2 nano-crystals simultaneously. Comparing with the samples without Ag doped, high efficiency up-conversion luminescences of Er3+ at 540 and 658 nm are distinctly observed in the silver nanoparticles containing glass-ceramics by the 980-nm excitation. Moreover, since the intensity ratio of green and red emissions changes after silver nanoparticles precipitation, the up-conversion mechanism of Er3+ is discussed.
050.5298 Photonic crystals 160.4670 Optical materials Chinese Optics Letters
2014, 12(8): 081601
