Crystals
·
2022
·Vol. 12
·期 7
·963
·
IF 2.67
Weili Wang,Shihai Miao,Dongxun Chen,Yanjie Liang
Trivalent lanthanides (Ln3+) doped bismuth-based inorganic compounds have attracted considerable interest as promising candidates for next-generation inorganic luminescent materials. Here, a series of K0.3Bi0.7F2.4(KBF) nanocrystalline particles with controlled morphology have been synthesized through a low-temperature aqueous-phase precipitation method. Using KBF as the host matrix, Eu3+, Tb3+, Pr3+, Nd3+, Sm3+,and Dy3+ions are introduced to obtain K0.3Bi0.7F2.4:Ln3+(KBF:Ln) nanophosphors. The as-prepared KBF:Ln nanophosphors exhibit commendable photoluminescence properties, in which multicolor emissions in a single host lattice can be obtained by doping different Ln3+ions when excited by ultraviolet light. Moreover, the morphology and photoluminescence performance of these nanophosphors remain unchanged under different soaking times in water, showing good stability in a humid environment. The proposed simple and rapid synthesis route, low-cost and nontoxic bismuth-based host matrix, and tunable luminescent colors will lead the way to access these KBF:Ln nanophosphors for appealing applications such as white LEDs and optical thermometry.
研究领域:
材料科学
·
纳米技术
·
光学
·
化学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 26
·8697-8705
·
IF 4.099
Yang Ding,Jie Liu,Ming Zeng,Xishu Wang,Junli Shi,Weili Wang,Yanru Miao,Xibin Yu
Rare earth (RE3+)-doped NaY(MoO4)2 nanocrystals are efficient materials for realizing multicolor emission, which plays an important role in displays, W-LEDs, solar cells and biolabeling. Up to now, research on the multicolor tuning properties of RE3+-doped NaY(MoO4)2 nanoparticles has mostly focused on traditional preparation routes such as the hydrothermal method and sol–gel process. However, the products obtained using these methods are usually large in size (on the micron/submicron scale) and agglomeration problems are inevitable. With the development of nano optoelectronic devices and bioluminescence labeling, there is an urgent need to find an efficient method to prepare nanoscale, monodispersed and NaY(MoO4)2:RE3+ nanocrystals (NCs) with good crystallinity and stronger emission properties. In this work, we demonstrate a simple, fast, reproducible and one-step synthesis of NaY(MoO4)2:Eu3+ NCs with sizes varying from 1–20 nm via a ligand-assisted reprecipitation strategy. The reaction mechanism and emission intensities of NaY(MoO4)2:Eu3+ NCs with various morphologies have been discussed in detail. Furthermore, Tb3+ and Eu3+ ion co-doped NaY(MoO4)2 NCs were also prepared, and various emission colors were obtained and tuned from red, orange-red, yellow and yellow-green to green. Energy transfer between the Tb3+ and Eu3+ ions in the NaY(MoO4)2 host matrix has also been demonstrated. Finally, a highly efficient and stable NaY(MoO4)2:0.05Tb,0.04Eu NC-based W-LED device was built, which indicates the promising future application for this material in the field of lighting. The tunable multicolour emission, ease of preparation and nanosize reveal that NaY(MoO4)2:RE3+ NCs have a potential application in full color displays and W-LEDs.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
无机化学
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ganggang Guo,Qiong Xi,Tao Yin,Jianju Nie,Yayuan Zhang,Li Guan,Zhenyang Liu,Fenghe Wang,Xu Li
Broadband near-infrared (NIR) phosphors are key materials for the preparation of NIR phosphor-converted light-emitting diodes (pc-LEDs). The wider coverage of the NIR spectrum means that more substances can be detected by NIR light and more applications are possible. However, ultra-broadband NIR phosphors with the full-width at half maximum (FWHM) greater than 200 nm still face challenges in terms of thermal stability as well as internal quantum efficiency (IQE). In this work, a series of La 2 CaTa x Zr (1- x ) O 6 (LCTZO): Cr 3+ phosphors was successfully synthesized by the high-temperature solid-phase method. The non-equivalent substitution strategy of Ta 5+ in place of Zr 4+ effectively modulates the crystal field environment of Cr 3+ and reduces the number of defects, thus modulating the luminescence properties of the phosphor. Under the 471 nm excitation, the spectrum of La 2 CaTa 0.3 Zr 0.7 O 6 : 2 % Cr 3+ can cover the 700–1400 nm band (FWHM = 201 nm) with IQE of 42.6 %, and the emission intensity can be maintained at 373 K at 74 % of that at room temperature . The prepared NIR pc-LED with ultra-wide spectral coverage shows better potential applications in the fields of night vision and biological tissue penetration.
研究领域:
材料科学
·
光学工程
·
生物医学工程
·
分子成像
·
光电子学
·
纳米医学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Zhao Zhenfu,Wu Zhihai,Cheng Jiong,Jing Liang,Hou Yafei
Organometal halide perovskite quantum dots (PQDs) have recently received much attention as a very promising family of materials with excellent performance in electronic and optoelectronic fields, but these perspectives are being restrained by the severe stability, such as chemical and optical degradations. Herein, we propose and demonstrate a facile solution synthesis of nanocomposites of CH3NH3PbX3 (X = Cl, Br, I) PQDs embedded in magnesium silicate hollow spheres. The resultant nanocomposites preserved the strong photoluminescence of the CH3NH3PbX3 PQDs, and the emission peak can be tunable from blue to red region. Photostability tests demonstrated that the nanocomposite samples were obviously more stable than the bare CH3NH3PbX3 PQDs. The photoluminescence (PL) of the nanocomposite sample still remained at 80% after 72 h UV LED illumination, which was much higher than the remnant PL (30%) of the pure CH3NH3PbX3 PQDs. With their high thermal stability and photostability, we demonstrated that these nanocomposites can be used as phosphors in an on-chip UV LED for multicolor display. It offers a facile method to protect perovskite quantum dots and may have great potential applications in solid-state lighting systems with demand of high-color quality such as lasers, displays, and light-emitting diodes.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
显示技术
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 18
·7333-7342
·
IF 4.569
Hua Yu,Liuyan Zhou,Renguang Ye,Degang Deng,Shiqing Xu
Polychromatic emission can be achieved by controlling the distribution of the rare earth activator in multi-cation lattices, which can be used in the fields of white light LED and fluorescence temperature sensing. However, it is still a challenge to control their distribution and location of the target site in a given host material because the distribution of the rare earth activator is uncertain. In this paper, we have chosen Li4SrCa(SiO4)2 as the multi-cation site host and induced the distribution of Eu2+ ions between different cation sites through anion substitution, for the first time, to regulate the luminescence characteristics of a series of Li4SrCaSi2O8−yN2y/3:Eu2+ phosphors. In Li4SrCa(SiO4)2:Eu2+ phosphors, the substitution of O2− by N3− triggered a distinct ordered to disordered structure transition of the SiO4 tetrahedron and induced the remote distribution of the Eu2+ activator, which was verified through the analysis of the XRD, EPR, FT-IR and fluorescence spectra. Due to the location of Eu2+ ions in different cation sites (Eu2+Sr and Eu2+Ca), two distinguishable emission peaks with tunable color emissions and different responses to temperature were realized. The white LED that utilized blue-orange-emitting Li4SrCaSi2O4N8/3:Eu2+ and green-emitting BaSi2O2N2:Eu2+ (500 nm) displayed an outstanding color rendering index (Ra) of 85.1. Based on the fluorescence intensity ratio (FIR) technique, an optical temperature measurement mechanism was hypothesized and studied in the temperature range of 293–473 K. The highest Sa of the material was 0.086 K−1, and Sr was 1.76% K−1 based on the FIR detection technology, revealing obviously better than most inorganic optical temperature-measuring materials reported before. Our work indicates that Li4SrCaSi2O8−2yN4y/3:Eu2+ is a promising material for application in White LEDs and optical thermometers.
研究领域:
材料科学
·
发光材料
·
无机化学
·
光电子学
·
传感器技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yixin Sun,Yining Wang,Minliang Deng,Xiaole Xing,Yiying Zhu,Mengmeng Shang
The swift progress in portable spectrometer technology has fostered a widespread need for compact light sources. Concurrently, near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs), characterized by their low cost and compact structure, emerge as an optimal choice. Inspired by phase optimization through fluxes, we successfully synthesized pure phase Lu 3 Mg 2 GaSi 2 O 12 (LMGS):Cr 3+ , 3 wt%MgF 2 luminescent materials by incorporating various fluxes including LiF, NaF, MgF 2 , CaF 2 , SrF 2 and BaF 2 . These materials emit broadband NIR light ranging from 620 nm to 1150 nm, with full width at half-maximums (FWHMs) exceeding 125 nm. By employing a dual-fluxes strategy to further enhance the luminescence intensity of Cr 3+ , the LMGS:3%Cr 3+ , 1 wt%NaF, 2 wt%MgF 2 sample exhibits a 2.45 times increase in emission intensity compared to the LMGS:3%Cr 3+ , 3 wt%MgF 2 sample. Concurrently, the quantum efficiency rises from 24 % to 46 %. Moreover, the integrated emission intensity of LMGS:3%Cr 3+ , 1 wt%NaF, 2 wt%MgF 2 retains at 75 %@425 K of its value at RT. Upon coupled with a 430 nm LED chip, the luminescent material exhibits an NIR output power of 43.8 mW@300 mA, indicating promising applications in rapid night identification, night vision and non-destructive testing.
研究领域:
材料科学
·
光学材料
·
固态照明
·
光子学
·
无机化学
✓ 已验证
DOI
高影响因子
Advanced Physics Research
·
2022
·Vol. 2
·期 4
·2200056
·
IF 0
Kuangnan Lyu,Gaochao Liu,Maxim S. Molokeev,Zhiguo Xia
Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are desired for optoelectronic and biomedical applications, while the development of target broadband NIR phosphors still remains a significant challenge. Herein, a kind of Cr 3+ -doped AlNbO 4 phosphors with a broad NIR emission ranging from 650 to 1400 nm under 450 nm excitation are reported. A giant red-shift emission peak from 866 to 1020 nm together with broadened full width at half-maximum of 320 nm is achieved simply by varying the doped Cr 3+ concentrations. Structural and spectroscopy analysis demonstrate that a concentration-dependent site-occupation of Cr 3+ emitters in different Al 3+ sites is responsible for the tunable NIR luminescence. The as-fabricated NIR pc-LED based on optimized AlNbO 4 :Cr 3+ phosphor exhibits great potential in night-vision applications. This work provides a novel design principle on the Cr 3+ -doped AlNbO 4 phosphor with tunable broadband luminescence from NIR-I to NIR-II, and these materials can be employed in NIR spectroscopy applications.
研究领域:
光学材料
·
生物医学光学
·
光电子学
·
无机功能材料
·
分子影像
✓ 已验证
DOI
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2022
·Vol. 78
·期 1
·83-88
·
IF 1.712
Arif Ullah,Jinghao Zhuang,Xiaozhan Yang,Wenlin Feng
Red emitting Li 2 CaSnO 4 : x Eu 3+ phosphors were successfully synthesized by the high-temperature solid-state method. The crystal structure, composite and luminescence properties (e.g. the excitation and emission spectra, fluorescent lifetimes, and CIE chromaticity coordinates) of the samples were investigated by X-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM), energy dispersive spectrometer (EDS) and spectral analysis technique. The emission spectra consist of the characteristic peak resultant to Eu 3+ under the excitation of 395 nm and the dominant emission peak is at 621 nm ( 7 F 0 → 5 L 6 ). The optimal red emission was obtained through 4% Eu 3+ doping. These new red Li 2 CaSnO 4 : Eu 3+ phosphors have the potential application for white LEDs.
研究领域:
材料科学
·
光电技术
·
固体化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
Bing Wang,Yonglin Wang,Ming Cui,Ting Yu,Zurong Du,Wanfu Wang,Pengbo Lyu
Lead-free copper halides have emerged as promising candidates for solid-state lighting, yet many reported systems still face challenges of limited efficiency, severe self-absorption, or insufficient device stability. Here, we report the synthesis of transparent millimeter-sized single crystals of (C8H20N)2Cu2Br4 (TEA2Cu2Br4) via a facile antisolvent-assisted evaporation method. Structural analysis confirmed that bulky TEA+ cations encapsulate [Cu2Br4]2− units, forming a spatially confined low-dimensional framework that promotes efficient radiative recombination of self-trapped excitons (STEs). TEA2Cu2Br4 exhibits deep-blue emission at 478 nm with a large Stokes shift of 166 nm, a long photoluminescence lifetime of 54 µs, and an ultrahigh PLQY of 98%. The material demonstrates remarkable robustness against continuous illumination, thermal cycling, electrical bias, and ambient exposure, with decomposition occurring only above 300 °C. Furthermore, ultraviolet-excited WLEDs fabricated by integrating TEA2Cu2Br4 with CsCu2I3 deliver balanced white emission with CIE coordinates of (0.3175, 0.3593), a correlated color temperature of 6138 K, and retain 93.8% of their initial electroluminescence intensity after 20 days of continuous operation. These results highlight TEA2Cu2Br4 as a structurally well-defined, high-performance hybrid copper halide with strong potential for environmentally friendly solid-state lighting.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 36
·期 9
·1835-1845
·
IF 3.089
Chen Changsong,Wu Yihua,Zhu Zhi-Gang,Shih Wan Y.,Shih Wei-Heng
Abstract All-inorganic perovskite materials have many advantages such as adjustable emission range, narrow emission peaks, and good crystallinity, which have attracted widespread interest. They can be used as solar cells, LEDs, photodetectors, displays, and other optoelectronic devices. However, poor environmental stability is the major factor limiting its applications. We introduced a Poly(styrene-ethylene-butylene-styrene) SEBS polymer to create perovskite/SEBS composite films which have excellent stability even in the water environment. Besides, due to the elastic nature of SEBS, the composite films exhibited good mechanical deformability and could maintain most of its fluorescence intensity after being stretched hundreds of times. A WLED device was constructed by stacking CsPbBr 3 /SEBS films and CsPbI 3 /SEBS films over a blue LED. The WLED performed well with color rendering index of 82.6 with chromaticity coordination (0.35, 0.36) and color temperature 4784 K. Graphic Abstract
In order to create a stable and flexible photoluminescent material, we combined a
poly(styrene-ethylene-butylene-styrene) (SEBS) polymer and cesium lead-halide
nanocrystals forming a flexible photoluminescent composite. The composite films
show both good environment stability and excellent flexibility.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
光子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Feiyan Xie,Junqiang Gu,Dekang Xu,Jiao Zou,Lihong Liu,Xuan Zhu,Sitong Lin,Huihao Zhong,Jinyu Yang
In the field of white-light LED lighting technology, the development of single-phase white light emitting phosphors with excellent luminescent thermal stability has been the core research focus. This study introduced a color-tunable Na 3 YSi 2 O 7 : x Tm 3+ , y Dy 3+ (abbreviated as NYSO: x Tm 3+ , y Dy 3+ ) phosphor. Under an excitation wavelength of 351 nm, through the energy transfer (ET) process from Tm 3+ to Dy 3+ dominated by dipole-dipole interactions and by finely adjusting the doping ratios of Tm 3+ and Dy 3+ ions, white light emission was successfully achieved in the NYSO:5%Tm 3+ ,1%Dy 3+ phosphor. The phosphor exhibited color coordinates at (0.340, 0.344), which were extremely close to the ideal white light region. Notably, the NYSO:5%Tm 3+ ,1%Dy 3+ phosphor exhibited remarkable thermal stability luminescent performance. At high temperatures of 424 K and 474 K, its emission intensity only decreased by 3.64% and 6.10%, respectively. Moreover, at a high temperature of 474 K, the chromaticity shift ( Δε ) of the phosphor was merely 6.16×10 -3 , demonstrating far superior anti-thermal quenching and luminescent color stability performance compared with similar phosphor materials. This work provided a new strategy for addressing the thermal stability issue of white LED phosphors and was expected to facilitate the advancement of white LED lighting technology.
研究领域:
材料科学
·
光学材料
·
固态照明
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xiao-Na Shen,Yu-Guo Yang,Wei Zhao,Xu-Ping Wang,Yuan-Yuan Zhang,Bing Liu,Hua-Jian Yu,Cheng-Cheng Qiu,Xian-Shun Lv,Rui Zhang,Lei Wei,Hua-Di Zhang
Phosphor-converted near-infrared light-emitting diodes (pc-NIR-LEDs) exhibit unique advantages over traditional NIR light sources, shifting the research focus toward high-performance NIR phosphors. The transition metal Cr 3+ ion serves as an ideal NIR activator, displaying highly sensitive emission characteristics that are strongly influenced by the primary crystal field environment. However, reports on Cr 3+ doping in SrLaGaO 4 (SLG) with a disordered structure as the host material remain limited. This study focuses on the synthesis of SrLaGa 1-x O 4 :x%Cr 3+ phosphors, where x ranges from 0.2 to 1.2. The optimized SLG:Cr 3+ phosphor demonstrates ultra-wideband NIR emission spanning from 650 to 1250 nm under excitation at 429 nm. Notably, the material exhibits superior thermal stability (ΔE = 0.35 eV, E G = 5.17 eV), retaining 66.55 % emission intensity at 423 K. Detailed optical analysis reveals that the emission from Cr 3+ -Cr 3+ ion pairs during the ( 4 A 2 , 4 T 2 → 4 A 2 , 4 A 2 ) transitions results in non-uniform broadening of the optical transition, which is one of the key factors contributing to its superior NIR performance. The output power of the pc-NIR-LED based on the SLG 0.99 :1.0 % Cr 3+ and 430 nm chip reached 0.418 W@150 mA. The results suggest that the novel SLG:Cr 3+ phosphor holds great prospects for advancing NIR lighting technology.
研究领域:
材料科学
·
光学物理
·
固态照明
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）