IEEE Photonics Journal
·
2025
·
IF 2.4
Yexi Sun,Qianyu Huang,Xin Guo,Maohui Yuan,Kai Han
Lanthanide-doped phosphors are of importance in the practical applications. In this work, we investigated the photoluminescence properties and random lasing behaviors of Dy3+-doped Sr2MgMoO6 phosphors synthesized by the high-temperature solid-state method. The SEM, XRD, and EDS with elemental mapping results reveal the successful fabricating of the high-quality Sr2MgMoO6 phosphors and confirm the uniform distribution of constituent elements. Structural characterization through precise Rietveld refinement confirmed that the material crystallizes in a tetragonal system with space group I4/m (No. 87), and its refined lattice parameters are also determined. The effect of different Dy3+ doping concentrations on the luminescent properties was analyzed. The optimal doping concentration for achieving efficient luminescence is fixed at 0.08 mol%. Typical emission peaks centered at 484 nm, 576 nm, 656 nm, and 756 nm of Dy3+ were observed under the blue light excitation. Additionally, random lasing phenomena were observed in the Sr2MgMoO6 phosphors when excited with a 355 nm pulsed laser under varying pump power densities. The random lasing behaviours were confirmed by the emergence of narrow emission peaks with a narrow full width at half maximum (FWHM) and the dependence of the intensity on the excitation intensity. This work highlights the potential of Dy3+-doped Sr2MgMoO6 phosphors as efficient luminescent materials and demonstrates their application in random lasing, which opens new possibilities for their use in optoelectronic and laser technologies.
研究领域:
材料科学
·
光电子学
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光子学
·
固体物理
·
激光技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jianxu Wang,Yan Xie,Junlan Guo,Xuemei Yao,Xue Geng,Jing Gao,Xuyao Feng,Zijing Zhou,Yuanyuan Liu,Bin Deng,Ruijin Yu
Novel apatite-type NaCa 3 Bi(PO 4 ) 3 F: x Sm 3+ (0.01 ≤ x ≤ 0.30) orange-red-light phosphors were synthesized through the solid-state method at high temperature. The crystal structure, energy band structure , density of state, phase purity, particle morphology , photoluminescence properties, thermostability, and luminescence decay of the phosphors were comprehensively characterized. When λ ex = 404 nm, the optimal NaCa 3 Bi(PO 4 ) 3 F:0.05 S m 3+ phosphor showed the orange-red emission (597 nm). The NaCa 3 Bi(PO 4 ) 3 F:Sm 3+ phosphors exhibited abnormal thermal quenching properties as their emission intensity increased by about 2.57% from 300 to 380 K. Their intensity at 440 K was still 1.01-fold stronger than that at room temperature. The abnormal thermal quenching mechanisms were well explained via the coordinate configuration scheme. The thermal activation energy ( E a ) was calculated to be 0.79 eV. The color purity of all the phosphors reached 99.9%. Ultimately, a white light-emitting diode (w-LED) was fabricated based on the tri-color RGB method. The color rendering index and the chromaticity coordinates of the fabricated w-LED were 89 and (0.310, 0.319), respectively. Thus, these high thermostability NaCa 3 Bi(PO 4 ) 3 F:Sm 3+ orange-red phosphors can be potentially used in w-LED applications.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Photonics Research
·
2021
·Vol. 9
·期 11
·2182-2189
·
IF 7.08
Shunfa Gong,Ruirui Wu,Sen Yang,Lifang Wu,Minmin Zhang,Qiuju Han,Wenzhi Wu
The toxicity and instability of lead halide perovskite seriously limit its commercial application in lighting, although it has high photoluminescence (PL) efficiency and adjustable emission. Here, lead-free bismuth (Bi) and antimony (Sb) codoped Cs2SnCl6 (BSCSC) microcrystals (MCs) are prepared successfully by a solvothermal method. The PL spectrum is composed of dual emission bands with the peak at 485 and 650 nm, of which relative intensity can be tunable through the change of Bi and Sb feeding contents, respectively. Because of the phonon–electron interaction, the PL intensity is enhanced as the temperature rises within the range of 80–260 K. Then, the nonradiative transition is intensified until 380 K, which results in decrease in PL intensity. Simultaneously, combining with time-resolved PL, it is concluded that the emission peak at 485 nm is attributed to the [BiSn+VCl] as the luminescent centers with the lifetime of hundreds of nanoseconds, and the emission peak at 650 nm is attributed to microsecond-timescale self-trapped excitons. The maximum values of relative sensitivity (SR) and absolute sensitivity (SA) values obtained are 3.82% K−1 and 5.11 ns ·K−1, which for the first time to our knowledge demonstrate that BSCSC MCs can be novel luminescent materials for developing better optical thermometry. White-light-emitting diodes (WLEDs) are constructed using BSCSC MCs only combined with an LED chip, the Commission Internationale de L’Eclairage color coordinates of which are (0.30, 0.37). It provides a novel scheme for the lighting field to realize WLEDs without adding additional commercial phosphors.
研究领域:
材料科学
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光学
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光子学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 39
·6910-6916
·
IF 3.756
Hanmei Fu,Chunli Jiang,Chunhua Luo,Hechun Lin,Hui Peng
Organic–inorganic manganese halide hybrids have attracted attention in the field of light-emitting diodes (LEDs) due to their simple preparation, environmental friendliness and tunable luminescence. Herein, two manganese halide hybrids, (C5H8N2)2MnCl4 and C5H8N2(MnCl2)xCly, are synthesized by adopting different ratios of 1-ethylimidazole and MnCl2. (C5H8N2)2MnCl4 and C5H8N2(MnCl2)xCly show strong green and red emission with photoluminescence quantum yields (PLQYs) of up to 79.77% and 83.33%, respectively, which is attributed to the different coordination environments of Mn2+. The reversible conversion between red and green emission of C5H8N2(MnCl2)xCly coming from its decomposition and recovery makes it an interesting fluorescent material. Their applications in fabrication of a white LED (WLED) and a tunable color LED by combining with a blue GaN LED illustrate their great potential as effective phosphors for solid-state light-emission.
研究领域:
材料科学
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光电子学
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光子学
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2020
·Vol. 5
·期 3
·1468-1476
·
IF 6.788
Hao Cai,Zhen Song,Quanlin Liu
Photodynamic therapy needing ultraviolet (UV) in deep tissue is hindered due to the low biological tissue penetration ability of UV light. Here, we demonstrate a persistent ultraviolet-emitting phosphor, LiLuGeO4:Bi3+,Yb3+, which can be re-stimulated by near infrared (NIR) light. Yb3+-doping significantly enhances the trap density without changing the thermoluminescence peak positions. The phosphor can be effectively activated by a 254 nm lamp and exhibits prominent persistent luminescence peaking at 350 nm. The decay time can be recorded much longer than 15 h. This phosphor exhibits simulated in vivo photostimulated persistent luminescence after a longtime decay by using in vitro NIR light penetrating biological tissue. Combined with CaAlSiN3:Eu2+, red persistent luminescence from Eu2+ is obtained. LiLuGeO4:Bi3+,Yb3+ makes up the shortage of excellent UVA persistent phosphors. It is expected to have potential applications as an in vivo renewable excitation source to trigger photosensitizers or fluorescent probes when used for biophotonic applications.
研究领域:
材料科学
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生物光子学
·
医学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Ying Chen,Han Zhang,Yi-Yang Sun
To achieve healthy illumination, phosphor-converted white light-emitting diodes (WLEDs) that can be excited by ultraviolet (UV)-violet light are becoming increasingly important. Herein, we report a novel yellow-emitting phosphor, Ba 2-x Sc 2 B 4 O 11 : x Eu 2+ (BSBO:Eu 2+ ), which exhibits exceptional optical properties and is suitable for UV-violet-excited WLEDs. BSBO:Eu 2+ shows a broad excitation spectrum ranging from 230 to 450 nm, and emits a yellow light with an ultrawide FWHM of about 137 nm centered at 577 nm. The internal and external quantum efficiencies of the phosphor were measured to be 89% and 41%, respectively. The fluorescence lifetime of BSBO:0.01Eu 2+ was determined to be 2.74 μs. By combining BSBO:0.01Eu 2+ with a commercial blue phosphor (BaMgAl 10 O 17 :Eu 2+ ) and a 365 nm LED, we achieved a warm WLED with a correlated color temperature (CCT) of 4543 K. By further integrating a green phosphor ((Ba, Sr) 2 SiO 4 :Eu 2+ ), the WLED achieved superior color quality, reaching an Ra of 93.0, in comparison with the commercial YAG:Ce 3+ with an Ra of 78.4, and a CCT of 7078 K—well-suited for precise color reproduction needs.
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
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 11
·2207296
·
IF 19
Zhijun Wan,Yuemiao Li,Yizi Zhou,Dongping Peng,Xuejie Zhang,Jianle Zhuang,Bingfu Lei,Yingliang Liu,Chaofan Hu
Carbon dots (CDs) have excellent properties and have made great progress in synthesis and applications. However, it is still a challenge to realize convenient preparation and highly emissive solid-state luminescence without the assistance of matrix. In this study, high-efficiency hydrophilic yellow emissive CDs (Y-CDs) with aggregation-induced emission (AIE) characteristics are synthesized by a one-pot microwave method. Y-CDs show weak yellow emission with a photoluminescence quantum yield (PLQY) of 6.14% in aqueous solutions, but exhibit a significantly enhanced PLQY of 58.35% in the solid state. The AIE characteristic is confirmed by the phenomenon that the fluorescence emission intensity of Y-CDs continues to increase with the gradual increase of the poor solvent fraction. The AIE phenomenon of Y-CDs is derived from the suppression of surface piperazine groups motions and decrease of the non-radiative rate, as is verified by a series of experiments. Finally, based on the high PLQY and AIE property, Y-CDs are applied as a color-converting layer on blue-light-emitting chips to fabricate white-light-emitting diodes with color coordinates of (0.31, 0.35), while Y-CDs are also explored for their potential applications in anti-counterfeiting, encryption and bioimaging.
研究领域:
材料科学
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光学
·
生物成像
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Zhihao Zhang,Huimin Li,Ran Pang,Wenjing Wang,Da Li,Lihong Jiang,Su Zhang,Hongjie Zhang
Phosphor-converted light emitting diodes (pc-LEDs) are essential for current lighting and display areas because of their unique properties of being uncomplicated, durable and economical. In previous studies, Pr 3+ doped red-emitting phosphors have attracted enormous research interest due to their high color purity. However, their photoluminescence excitation (PLE) spectra are always hard to be combined with LED chips. This mismatch is a great obstacle to achieve Pr 3+ phosphors utilizing in LED devices. Here, to circumvent this issue, Pr 3+ -doped Ca 3 MgTiGe 3 O 12 (CMTG) red-emitting phosphor was optimized with PLE band shifting from 330 nm to 360 nm after tuning with Bi 3+ co-doping based on the structure and phosphorescence properties. The chip-matched excitation makes it a good candidate for white LEDs (wLEDs) fabrication to improve the output quality of device. Meanwhile, the high color purity of 93.02 % was obtained, which is conducive to widening the color gamut of backlight display applications. The photoluminescence (PL) spectra, fluorescence lifetime, and X-ray photoelectron spectroscopy (XPS) analysis were employed and discussed in detail to explain the role of Bi 3+ played in the system. Finally, wLEDs were fabricated with CMTG:Pr 3+ , Bi 3+ , showing a high color rendering index (Ra) of 94.4. And the color gamut covers ∼80 % of the National Television System Committee (NTSC) standard, suggesting great potential for applications of wLEDs and backlight display.
研究领域:
材料科学
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发光材料
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固态照明
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显示技术
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无机化学
·
光电子学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Zhaowu Wang,Haipeng Ji,Jian Xu,Xinghui Hou,Jumpei Ueda,Setsuhisa Tanabe,Shasha Yi,Ying Zhou,Deliang Chen
A single-crystalline defect-less phosphor is desired for efficient luminescence of the therein doped optical activators. In this paper, microsized MgAl2O4:Mn4+ single-crystal phosphors with bright red luminescence were grown in molten LiCl salt at 950 °C, for application in blue LED pumped white lighting. By comparing the phosphor formation from various Mg2+- and Al3+-bearing sources, both the template-formation and the dissolution-diffusion processes were evidenced to account for the formation of the microsized MgAl2O4:Mn4+ crystallites. Using nano γ-Al2O3 as the Al3+-bearing precursor, the uniform MgAl2O4:Mn4+ microcrystallites with a {111} planes-exposed tetragonal bipyramid morphology were obtained. The photoluminescence property was studied at various temperatures, and Mg ↔ Al anti-site disorder induced luminescence broadening was discussed. The Mn4+2Eg → 4A2g transition in MgAl2O4 shows a quite short luminescence wavelength peaking at 651 nm and ultrabroadband emission extending to 850 nm. The luminescence is relatively robust against thermal effect with relatively high thermal quenching temperature of 400 K and activation energy of 0.23 eV. Employing the red-emitting MgAl2O4:Mn4+ crystallites, blue LED pumped white lighting prototypes were fabricated which simulate the solar-like spectrum and show neutral to warm white.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 39
·10241-10250
·
IF 5.256
Mengmeng Zhu,Yuexiao Pan,Luqing Xi,Hongzhou Lian,Jun Lin
Mn4+-activated red phosphors have attracted considerable attention as promising red components in the spectra of white light emitting diodes (WLEDs) to achieve warm white light with superior performance. Herein, a novel red phosphor based on Mn4+-doped dodec-fluoride Li3Na3Al2F12:Mn4+ (LNAF:Mn) with microcubic morphology was obtained at room temperature. To elucidate the underlying relationship between the crystal structure and photoluminescence of LNAF:Mn, a phosphor LiNa2AlF6:Mn4+ with similar composition has been prepared, and their morphology and optical properties were comparatively investigated. The emission of the red phosphor LNAF:Mn is blue shifted compared to LiNa2AlF6:Mn4+ suggesting that the chromaticity coordinates of LANF:Mn are closer to the ideal red point (0.67, 0.33). The luminescence properties of LNAF:Mn have been improved by optimizing the synthetic conditions. This work exhibits a strategy to explore a novel Mn4+-doped fluoride except for the identified hexa-fluorides. Employing the as-prepared red LNAF:Mn as a red component, a high-performance WLED with a correlated color temperature (CCT) of 3874 K and a color rendering index (CRI) of 90.6 was obtained. This suggests the phosphor is a potential commercial red phosphor in warm WLEDs.
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
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 36
·9255-9263
·
IF 5.256
Luqing Xi,Yuexiao Pan,Mengmeng Zhu,Hongzhou Lian,Jun Lin
A kind of red-emitting phosphor NaKSnF6:Mn4+ (NKSF:Mn) has been obtained from NaF and KF with a certain molecular ratio in HF solution at room temperature. The phosphor NKSF:Mn exhibits superior optical properties including high color purity with narrow-band emissions as well as better chromaticity coordinates compared to the red phosphors Na2SnF6:Mn4+ (NSF:Mn) and K2SnF6·H2O:Mn4+ (KSFH:Mn). The composition and structure of NKSF:Mn have been identified by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and transmission electron microscopy (TEM). The formation mechanism of NKSF:Mn is discussed and the morphology, thermal stability, and optical properties of NKSF:Mn have been investigated. The luminescence intensity of NKSF:Mn has been improved by optimizing synthetic parameters. A white light-emitting diode (WLED) fabricated using a blue GaN chip, a yellow YAG:Ce phosphor, and the as-prepared red phosphor NKSF:Mn exhibits superior warm white light with a color rendering index (CRI) of 90.3 at a correlated color temperature (CCT) of 3746 K.
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
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Liangjie He,Shiliang Mei,Qiuhang Chen,Wanlu Zhang,Jie Zhang,Jiatao Zhu,Guoping Chen,Ruiqian Guo
In situ growth of ZnO layer on the surface of carbon dots was realized via a two-step method, which resulted in an enhancement of the broad visible emission with a high quantum yield. Influence of the refluxing time, the temperature and the oleylamine/octadecene ratio was investigated to address the key factors on the preparation of the carbon dots. Under the optimal conditions, the carbon dots with an average diameter of 3.4 ± 0.4 nm and a photoluminescence quantum yield of 29.3% were achieved. Remarkable improvements of photoluminescence were achieved by the hybridization of the ZnO layer, which can eliminate the surface-trap from the C cores and form the new centers of emission. The synergistic effect arising from the C/ZnO hybridized structure obviously broadened the visible emission and enhanced their photoluminescence quantum yield from 29.3% to 47.3%. The as-prepared highly emissive quantum dots exhibited a broad and stable emission with the Commission Internationaled ‘E’ clairage chromaticity coordinate of (0.23, 0.34), which could offer a promising solution for the future-generation white light emitting diodes.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）