Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 8
·1675-1684
·
IF 5.066
M. Wu,E. H. Song,Z. T. Chen,S. Ding,S. Ye,J. J. Zhou,S. Q. Xu,Q. Y. Zhang
Single-band red upconversion (UC) emission of Er3+ has been successfully achieved in Yb3+/Er3+ codoped KMgF3 nanocrystals via a nonequivalent substitution strategy, in which lanthanide ions probably aggregate, as evidenced by density functional theory calculations and upconversion dynamic processes. The aggregation of Yb3+/Er3+ would cause large cross-relaxation probabilities among the lanthanide ions when photo-excited, resulting in the disappearance of the green emission and the population of the red emitting level of Er3+. Interestingly, the single-band feature is independent of the dopant concentration and pump power. The possible UC mechanism is discussed in detail according to nanocrystal morphology, ion radii, lattice parameters and decay lifetime studies of the Yb3+–Er3+ doped analogous compounds (KMgF3, KZnF3 and KCdF3). It could be concluded that Yb3+/Er3+ ions tend to aggregate in KMgF3, resulting in the largest ratio of red to green UC emission. This research may give a perspective toward tuning the UC emission of lanthanide ions.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Na Zeng,Peng Zhao,Xiaoman Li,Tiefeng Xu,Xueyun Liu
Co-doping of Yb 3+ with Mn 2+ is a promising way to realize broadband up-conversion (UC) luminescence. The tunable broadband emission has been widely demonstrated in crystal materials, but the research on Yb 3+ /Mn 2+ co-doped transparent optical glass has been scare, especially in fluoride-based transparent glass ceramics (GC) that can realize the uniform ions incorporation and efficient UC emission. Herein, a series of Yb 3+ /Mn 2+ activated transparent fluorosilicate GCs containing perovskite KMgF 3 nanocrystals were successfully prepared, and the effect of heat-treatment process and/or Mn 2+ ion content on the UC luminescence modulation has been investigated. Our results show that the spontaneous crystallized precursor sample exhibits only a green emission at ~538 nm, while additional orange-emitting band centered at ~613 nm is noticeable in the GCs with the gradual precipitation of KMgF 3 nanocrystals after heat-treatment. The controllable luminescence can be assigned to the formation of Yb 3+ -Mn 2+ dimers that are located in multiple coordination environments provided by the glass matrix and crystalized nanocrystals. In addition, the prepared GC samples exhibit excellent reversible emission characteristics during heating and cooling cycles. This research not only provides a new option to design desirable coordination environment for Yb 3+ -Mn 2+ dimers, also helps to recognize the UC process in the transparent matrix in detail.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Enbei Yang,Han Ma,Peng Ren,Wenting Liu,Mengyan Yang,Jing Wan,Yurong Guo,Qiang Zhou,Zhengliang Wang
The growing demand of high-performance near-infrared (NIR) phosphors has sparked significant globe interest. In this study, we present a thermally stable NIR-emitting fluoroperovskite phosphor, KMgF 3 :Cr 3+ , synthesized via a hydrothermal method through substitution of Mg 2+ with Cr 3+ . The physicochemical and spectroscopic properties, including crystal structure, bandgap, morphology, spectral feature, and photoluminescence thermal stability, were systematically investigated. Results reveal that KMgF 3 :Cr 3+ exhibits a broadband NIR emission spanning 600-1000 nm (peaking at 780 nm) under blue light excitation and demonstrates exceptional thermal stability, retaining 86% of its room-temperature emission intensity at 423 K. Leveraging these properties, we fabricated a prototype light-emitting diode by coupling the KMgF 3 :Cr 3+ phosphor with a blue InGaN chip. The resulting device enabled high-contrast night vision imaging and clear visualization of human palm veins, highlighting its potential for advanced spectroscopic applications.
研究领域:
材料科学
·
光电子学
·
固态照明
·
光谱学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lili Li,Yingdan Song,Hongxin Song,Kaige Cheng,Qiang Xu,Lei Zhao
The light waveguiding effect of transparent glass ceramics (GCs) on mechanoluminescence (ML) signals is highly attractive for remote stress sensing and structural health monitoring applications. However, a prerequisite for generating ML in GCs is pre-irradiation with high-energy rays, which not only increases application costs but also poses a risk of GCs devitrification. Herein, we propose a safe, non-destructive, and convenient charging method for the ML of KMgF 3 : Tb 3+ GCs, namely ultraviolet (UV) light charging. By effectively filling the intrinsic defects in KMgF 3 : Tb 3+ nanocrystal using UV light, we achieved trap-controlled ML in rigid GCs. Moreover, this ML is attributed to thermoluminescence (TL) induced by frictional heating during mechanical stimulation. Additionally, when the GCs powder is combined with flexible polydimethylsiloxane (PDMS), a self-powered (without any pre-charging) ML induced by interfacial triboelectricity can also be achieved, which is similar to the results observed in most flexible ML systems. This work proposes a more straightforward and safer approach for applications such as mechanical sensing based on the ML of transparent GCs.
研究领域:
材料科学
·
光学
·
传感技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）