CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xinwei Li,Hualan Xu,Xianming Xia,Feiyan Xie,Shengliang Zhong,Dekang Xu
Sc 2 W 3 O 12 is an important host matrix for rare-earth doped luminescence. However, the conventional method to prepare the material is solid-state reaction, which results into coarse and irregular morphologies. In this work, Eu 3+ doped Sc 2 W 3 O 12 phosphors with high crystallinity and pure phase were successfully synthesized via one-step hydrothermal method . It was found that the crystalline phase changed from Sc 2 W 3 O 12 phase to Na 4 Sc 2 (WO 4 ) 5 phase when the molar ratio between Sc(NO 3 ) 3 and Na 2 WO 4 decreased. The temperature-dependent X-ray diffraction analysis was performed to prove the negative thermal expansion property of Sc 2 W 3 O 12 . A systematic study on the effect of reaction time, temperature and Eu 3+ doping concentration was explored. It was also found that the as-prepared samples displayed tunable emission colors, ranging from blueish white to orange red. Particularly, the white light emission with the chromaticity coordinate of (0.3395, 0.3289) can be realized in Sc 2 W 3 O 12 : 5% Eu 3+ . What's more, the photoluminescence properties of the samples were investigated under different ambient temperatures between 97 and 280 K. The result clearly showed energy transfer between Eu 3+ and WO 4 2− . The above results suggested that Sc 2 W 3 O 12 :Eu 3+ can be excellent candidate for solid-state lasing, panel display and WLEDs.
研究领域:
材料科学
·
光电
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Guowei Zhang,Ying Bai,Caiyan Yu,Tongtong Xuan
The core bottleneck problem of solid-state carbon nanodots (CDs) is aggregation-induced luminescence quenching (AIQ) effects. Herein, we report an approach to obtain a strong fluorescence emission CD@monodisperse mesoporous silica nanosphere-stellate (CD@MSNS) hybrid phosphor with highly concentrated emitting centers, where the CDs are effectively attached to the MSNS particles through physical adsorption and hydrogen bonding . The effective adsorption between CDs and MSNS could increase the distance between CDs, which could steadily hinder the AIQ effect of CDs. The highlight of this method is to prevent the aggregation of CDs upon drying. The obtained CD@MSNS hybrid phosphor possesses excellent thermal-stability and photostability. A white light-emitting diode (WLED) with a luminous efficiency of 40.6 lm/W, CIE coordinates of (0.3003, 0.3731), and color rendering index (CRI) of 80.9 is fabricated based on monochromatic converter of the yellow CD@MSNS hybrid phosphor. This study provides a new vision to solve the AIQ effects of quantum nanodots and offers a simple method for CDs application in WLED.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2022
·
IF 1.438
Junchao Cui,Zhenxing Qin,Jingjing Bai,Yufei Zhang,Xuewen Zhang,Runze Miao
It is profound to obtain simply carbon nanodots (CDots)-based solid-state fluorescent in photoelectric field. However, synthesizing such material is still faced with a challenge due to the serious quenching effect. Here, a microwave pyrolytic route is reported to rapidly synthesize sulfur (S) and nitrogen (N) co-doping CDots wrapped by the crystalline phthalate (CDots/PA). The results show that CDots/PA presents needle-like crystal to coat abundant cluster of CDots inside, after fully optimizing the preparation conditions. The solid state CDots/PA emits a dazzling fluorescence with the fluorescence quantum yield (FLQY) = 1 7 %, which is attributed to the formation of barrier from the crystal to avoid the aggregation of CDots. In addition, due to the co-doping of S and N elements, it also presents an orange–red light with a multipeak feature. The excellent photoluminescence (PL) property of CDots/PA gives it an advantage to fabricate light emitting diode (LED)/white light emitting diode (WLED) devices, which achieves an orange light with the correlated color temperature ( CCT ) = 1 8 1 0 K, color rendering index ( CRI ) = 5 9 and a warm-white light with the CCT ≈ 3700 K, CRI ≈ 82 at the Commission Internationale de L’Eclairage ( CIE ) = ( 0 . 4 3 , 0.40) combined with the commercial phosphors. Moreover, CDots/PA also shows an excellent recognition capacity in the application of detecting latent fingerprints, endowing such fluorescent nanomaterials broad prospect in the photoelectric industry.
研究领域:
材料科学
·
光电领域
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 47
·17966-17973
·
IF 4
Shuai Wei,Zeyu Lyu,Dashuai Sun,Pengcheng Luo,Zheng Lu,Luhui Zhou,Mingrui He,Sida Shen,Hongpeng You
In this work, a series of BaSrGd4O8:xBi3+ blue phosphors was synthesized employing the high-temperature solid-state method. Phase purity of the samples was verified by X-ray diffraction and Rietveld refinement. Time-resolved photoluminescence spectra revealed the existence of two distinct Bi sites. Subsequent optimization of dopant types and doping levels in the batch led to an almost twofold increase in quantum efficiency. The introduction of Eu3+ into the phosphors facilitated the construction of an energy transfer pathway. As the concentration of Eu3+ was increased, the emission color changed from blue to purple and finally to red. In addition, the thermal stability and potential applications of the phosphors were extensively investigated. Finally, two WLED devices were successfully fabricated with color rendering indices of 96.27 and 92.18, and correlated color temperatures of 5198 and 2475 K. This underscores the prospective application of these phosphors in the field of high-quality warm WLEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Liu Lu,Zhang Anlin,Sun Huapeng,Lei Yanhua,Deng Bin
To address the insufficient color performance in contemporary solid-state lighting, a novel series of orange-red-emitting KSr 6 ScSi 4 O 16 :Sm 3+ (KSSSO: Sm 3+ ) phosphors was synthesized employing conventional solid-state synthesis. Comprehensive characterization encompassing phase analysis, luminescence properties, and thermal behavior was performed on the temperature-optimized material. Under 402 nm excitation, the Sm 3+ -activated phosphors exhibit four distinct emission bands centered at 562 nm, 599 nm, 645 nm, and 708 nm, corresponding to the characteristic 4 G 5/2 → 6 H 5/2 , 4 G 5/2 → 6 H 7/2 , 4 G 5/2 → 6 H 9/2 , and 4 G 5/2 → 6 H 11/2 transitions of Sm 3+ ions, respectively. Notably, the 599 nm emission ( 4 G 5/2 → 6 H 7/2 transition) dominates the luminescence spectrum, resulting in an orange-red emission color for the phosphor. The ideal Sm 3+ concentration was determined to be 2 mol%, exceeding this level induces concentration quenching primarily via dipole-dipole interactions. All synthesized samples demonstrate exceptional color purity exceeding 98%. The phosphor exhibits the remarkable property of very low thermal quenching, demonstrating exceptional thermal stability with a retention intensity of 99.58% even at an elevated temperature of 420 K. A phosphor-converted white light-emitting diode (pc-WLED) was fabricated via a tri-color blending approach, demonstrating an ideal correlated color temperature (CCT) of 5638 K and an excellent color rendering index ( R a = 92.8). These outstanding photometric properties confirm the exceptional suitability of the phosphor for high-performance WLEDs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Zhanghai Tian,Kang Wang,Heng Yu,Huangyao Chen,Xiang Guo,Ruirui Cui
Er 3+ -activated Ca 2 GaTaO 6 double-perovskite phosphors were synthesized by a high-temperature solid-state method and investigated for their structural and optical properties. X-ray diffraction and ionic-radius analysis confirm that Er 3+ ions preferentially replace Ca 2+ sites in the orthorhombic Pnma lattice, forming a stable single phase. Microstructural and XPS results verify uniform dopant distribution and the presence of oxygen-related defects beneficial to luminescence. Under 379 nm excitation, the phosphors exhibit strong green emission bands ( 2 H 11/2 , 4 S 3/2 → 4 I 15/2 ) and a weaker red band ( 4 F 9/2 → 4 I 15/2 ). The optimal Er 3+ concentration ( x = 0.02) achieves the highest emission intensity with a critical interaction distance of 11.5 nm, indicating quadrupole–quadrupole-type concentration quenching. Temperature-dependent up-conversion spectra show reliable fluorescence-intensity-ratio (FIR) behavior based on the thermally coupled 2 H 11/2 and 4 S 3/2 levels. The maximal absolute and relative sensitivities reach 1.17 %/K and 2.23 %/K, respectively, demonstrating excellent temperature-sensing capability comparable to other Er 3+ -based perovskites. Furthermore, the phosphor exhibits near-infrared emission around 1545 nm with similar concentration-dependent trends, indicating potential for dual-mode Visible/Near-infrared (NIR) detection. These results highlight Ca 2 GaTaO 6 :Er 3+ as a multifunctional luminescent material combining efficient green–red emission, competitive thermometric sensitivity, and NIR capability, showing promise for solid-state lighting and non-contact optical temperature sensing applications.
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xiaoyi Liu,Haiping Xu,Yunxiao Zhang,Zhendong Fu,Feng Hong,Ge Pang,Guixia Liu,Dan Li,Xiangting Dong,Jinxian Wang
Chrysanthemum-like K 2 LiAlF 6 :Mn 4+ phosphors were synthesized by simple co-precipitation method without using HF. The K 2 LiAlF 6 :Mn 4+ phosphor can be effectively excited through blue light at 465 nm, then produces sharp red-light emission near 634 nm. The luminescence quenching of Mn 4+ is caused by the d-d interaction between Mn 4+ ions. The effects of surfactant and lithium source on the luminescent properties of K 2 LiAlF 6 :Mn 4+ phosphors were discussed. Mn 4+ is located in a strong crystal field environment in the K 2 LiAlF 6 matrix and its emission mechanism is discussed. Warm white light emitting diode (WLED) device, which is fabricated by coating a certain proportion mixture of yellow YAG:Ce 3+ phosphor and red K 2 LiAlF 6 :5%Mn 4+ phosphor on the blue GaN chip, has low correlation color temperature (CCT = 3588 K), high color rendering index (R a = 90.8) and good electroluminescence stability under different currents. These properties illustrate that K 2 LiAlF 6 :5%Mn 4+ phosphor is a promising red light emitting material.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 46
·16516-16523
·
IF 4.099
Lei Zhang,Luqing Xi,Yuexiao Pan,Yajun Jia,Mingmei Wu,Hongzhou Lian,Jun Lin
A series of red-emitting phosphors composed of Li2ZrF6:Mn4+ (LZF:Mn) have been synthesized via an ionic-exchange reaction route at room temperature. The microstructure and optical characterizations have been investigated according to the detailed experiments. The morphology of the phosphor LZF:Mn changes with the concentration of HF, the reaction time and temperature. The uniform crystals of LZF:Mn with regular hexagonal tablets have been obtained in 30–40 wt% HF solutions by conducting the reaction at room temperature for about 8 h. The influences of reaction parameters on the morphology and photoluminescence properties of LZF:Mn have been systematically investigated. The luminescence intensity of LZF:Mn has been optimized by controlling the synthesis procedure and parameters. The white light-emitting diode (WLED) fabricated with LZF:Mn and Y3Al5O12:Ce3+ (YAG:Ce) on InGaN LED chip displays a warm white light with correlated color temperature (CCT) at 3789.4 K and color rendering index (CRI) of 91.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Haoshuang Fan,Xianguo Meng,Yingchao Xu,Yi Lu,Yue Liu
A series of novel Ca 2-x ScNbO 6 :xEu 3+ double perovskite phosphors were synthesized by high-temperature solid-state reaction technique. The physical phase, micromorphology, photoluminescence properties, concentration and thermal quenching effect of the phosphors were analyzed. Research shows that: Ca 2-x ScNbO 6 :xEu 3+ phosphors can be excited by ultraviolet or Blu-ray LED chips and displays a strong orange-red light luminescence at 614 nm. The sample with optimum doping concentrations has a quantum efficiency of 99.13% at room temperature, and the brightness only decays by 7.49% at 433 K. The sample has excellent thermal stability, with a thermal quenching extinction activation energy of 0.497 eV. Finally, the samples are packaged with 395 nm chips together with green and blue phosphors to obtain white LED, that emits bright white light under forward bias currents and have the advantages of lower correlated color temperature (less than 4390 K) and higher color rendering index (higher than 89). The above results indicate that Eu 3+ ion-doped Ca 2 ScNbO 6 phosphor can be applied to white LED technology.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Yan Zhang,Lei Zhou,Dan Li,Hui Li,Lei Zhang,Wei Shen,Ming Li,Rongxing He
Hitherto, three-dimensional (3D) perovskite single crystals with a low exciton binding energy generally possess inferior photoluminescence (PL) performance due to the spatially unconfined nature of excitons. In this work, 3D CsCdCl3 single crystals with multiple emissions from self-trapped excitons (STEs) have been developed, which unsurprisingly exhibit a discouraging PL quantum yield (PLQY) of ∼4.8%. To improve the luminescence efficiency, Mn2+ and Sn2+ are introduced into the lattice as dopants, respectively. By embedding Mn2+ ion into CsCdCl3, the long Mn–Mn distance enables the resultant material to produce an intense orange emission (∼100% PLQY) from the d–d orbital transition (4T1–6A1) of Mn2+. Intriguingly, the embedded Sn2+ triggers the formation of Jahn–Teller-like STEs that induces a subsequent deep red emission with a PLQY of ∼28.22%, which is quite high for 3D bulk perovskites. Such a remarkable PL efficiency is attributed to the distinctive bonding mode of CsCdCl3 that encourages the expression of the Sn 5s2 lone pair. Furthermore, a white-light-emitting diode (WLED) is also fabricated with Mn2+-doped CsCdCl3 to show its potential in lighting application. This work paves a new avenue to improve the luminescence performance of bulk 3D perovskite materials.
研究领域:
材料科学
·
光电
·
光子学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Guoxiu Xing,Xinyue Zhang,Kai Sheng,Chenyi Wang,Yu Zhang,Ruijin Yu,Shili Liu
The novel Er 3+ -doped Li 3 Gd 3 Te 2 O 12 (LGTO) phosphors were synthesized via the solid-state reaction method. Under the 377 nm excitation, strong green luminescence was observed from the phosphors, resulting from the typical Er 3+ transitions 2 H 11/2 – 4 I 15/2 and 4 S 3/2 – 4 I 15/2 . The optimum doping concentration was 1.5 mol%. The Inokuti-Hirayama (I-H) model and Dexter theory confirmed that the energy transfer mechanism occurs primarily through the nearest neighbor ion interactions. The LGTO:1.5 mol%Er 3+ phosphor exhibited outstanding thermal stability, retaining 125.19% at 480 K. At 300 K, the prepared phosphor exhibited a relative sensitivity of 1.12% K −1 . The fabricated white light-emitting diode (w-LED) showed excellent performance with a high color rendering index ( R a ) of 88, Commission International de L’Eclairage coordinates of (0.341, 0.329), and a low correlated color temperature 5097 K. The LGTO:Er 3+ phosphors not only possess good solid-state luminescent properties but also serve as an outstanding basis for the development of high-sensitivity optical thermometry.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Rong-Yan Zhang,Ting Zhu,Jin Zhang,Dong-Sheng Shao,Ying-Zhao Ma,Guo Peng,Xiaoming Ren
Single-component white-light-emitters ensure color stability while reducing device complexity, which are ideal candidates for white light-emitting diodes (WLEDs). However, the realization of single-component white-light emission with high efficiency and stability is still a challenge. Herein, a supramolecular cation strategy was used to synthesize the organicinorganic hybrid copper(I) halide [(AMTA)(18C6)]₂Cu₂I₄ (1), with AMTA = 1-adamantanamine and 18C6 = 18-crown-6. The structure of 1 comprises a [Cu₂I₄]²⁻ anion, formed from two edge-sharing CuI₃ triangles, and two [(AMTA)(18C6)]⁺ supramolecular cations. Compound 1 exhibits efficient white-light emission featuring dual bands centered at 480 nm and 642 nm. The CIE coordinate (0.32, 0.33) approaches the pure white point (0.33, 0.33), while the quantum yield reaches 62.09%. Such efficient white-light emission arises from two self-trapped exciton (STE) states within the inorganic unit.Furthermore, compound 1 shows remarkable stability, remaining stable for over 90 days in air and for 15 days under 75% humidity conditions. The single-component WLED fabricated using this material achieved a color rendering index (CRI) of 84, meeting the requirement for everyday lighting applications. This study demonstrates a novel approach to engineering single-component white-light phosphors suitable for solid-state lighting applications.
研究领域:
无机化学
·
材料科学
·
光电子学
·
固态照明
·
杂化材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）