Laser & Photonics Reviews
·
2023
·Vol. 17
·期 5
·2200911
·
IF 11
Zuobin Tang,Feng Du,Lei Zhao,Hu Liu,Zhihua Leng,Huidong Xie,Gangyi Zhang,Yuhua Wang
An important challenge in the research and development of compact near-infrared (NIR) light sources is the discovery of new efficient ultra-broadband NIR luminescent materials to replace the conventional Cr 3+ -doped compounds. Herein, this work reports a divalent europium-doped Ba 3 GeO 4 Br 2 phosphor that exhibits a high photoluminescence quantum yield of 48.8% and an ultra-broad emission band ranging continuously from 500 to 1100 nm (full width at half maximum = 202 nm) under near-ultraviolet or blue light excitation. A strategy of embedding alumina crucible in high purity graphite crucible is devised and deployed during solid-state sintering to facilitate the conversion of Eu 3+ into Eu 2+ . Theoretical calculations, structural refinement, and spectral analysis demonstrate that the visible to NIR emission in Ba 3 GeO 4 Br 2 :Eu 2+ originates from the Eu 2+ ions occupying the distorted Ba3O 3 Br 4 polyhedra in the lattice. The as-prepared phosphor-converted light-emitting diode device achieves an optical output power of 30.1 mW@100 mA (520–1100 nm) and a photoelectric efficiency of 22%@100 mA (350–1100 nm). Experiments on tissue penetration and NIR imaging illustrate its application in spectral detection and food quality testing appears promising.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Ying Lv,Yuhan Wang,Yan Xue,Chunlai Huang,Shenyu Qiu
Phosphors featuring cyan emissions (480-520 nm) are highly demanded to obtain high-quality white light-emitting diodes (WLEDs). However, current cyan phosphors suffer from unsatisfactory luminescence efficiency, which limits their practical use. Herein, we report flux-assisted enhancement of cyan emission in Sr 8 Si 4 O 12 Cl 8 :Eu 2+ (SSOC:Eu 2+ ) through deliberate optimization of the flux species and amount. The introduction of H 3 BO 3 into this cyan phosphor facilitates crystallization and increases Eu 2+ ammount in the host, resulting in an enhancement of emission intensity. The optimized flux-assited (1.5 wt% H 3 BO 3 ) SSOC:4%Eu 2+ ( λ em = 489 nm) exhibits an emission intensity 2.39 times higher than that of the SSOC:Eu 2+ preapred without flux, together with high internal quantum efficiency (IQE, 84.4%) and external quantum efficiency (EQE, 45.2%) under 365 nm excitation. Moreover, the PL intensity of this cyan phosphor keeps 85.7% and 58.6% of its room-temperature value at 423 and 623 K, respectively. A high-quality WLED with both color rendering index (CRI) and R9 values of 91, was fabricated by combining the cyan phosphor with commercial green and red phosphors, demonstrating the great potential of H 3 BO 3 -assited SSOC:Eu 2+ in full-visible-spectrum WLEDs. This work provides an effective strategy for substantially improving the emission intensity of phosphors by regulating the microenvironment of the host.
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高影响因子
Advanced Optical Materials
·
2025
·Vol. 13
·期 29
·e01563
·
IF 7.2
Tao Hu,Hong Yang,Yulan Guo,Jiaqi Huang,Yan Gao,Hang Lin
Polycrystalline phase transition provides an effective method to modulate structure of luminescent materials, offering a promising pathway for expanding optical properties and adaptive optoelectronic applications. In this study, for the first time the controlled β → ɑ phase-transition engineering is reported in Sr 2 SiO 4 :Eu 2 + glass ceramic (GC) through chemical doping of Eu 2 + ions, where the Eu 2 + ions act dual-functionally as structural modulator and stabilizer. Molecular dynamics simulations reveal that Eu 2 ⁺ doping does not significantly modify the short-range order of glass, indicating that the β → α phase transition primarily results from dopant-induced crystallization dynamics. Interestingly, the α -phase variant demonstrates thermochromic properties, enabling fluorescent anti-counterfeiting applications; while the β -phase variant shows superior thermal stability (82% photoluminescence remained at 423 K), excellent water-resistance, and extraordinarily stable color emission, making it suitable for high-quality lighting with color rendering index up to 95. This work provides a new thought of designing a GC platform via controllable polymorphic phase transition toward multifunctional photonic applications.
研究领域:
材料科学
·
光子学
·
光电子学
·
固态化学
·
发光材料
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高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Muyao Wang,Yanjie Zhang,Zeqing Hu,Jinghui Zhang
The single-phased white light-emitting Ca 4 (PO 4 ) 2 O: Tm 3+ , Tb 3+ , Eu 2+ phosphors with tunable color emission were synthesized by solid-state reaction method. The photoluminescence properties, crystal structure, decay time and cross-relaxation from Tm 3+ to Eu 2+ were investigated in detail. Under excitation of 352 nm, Tm 3+ singly doped Ca 4 (PO 4 ) 2 O (denoted as TTCP) phosphors exhibited an intense emission peak at 458 nm attributed to 1 D 2 → 3 F 4 transition of Tm 3+ ions and a broad emission peak in the range of 400–411 nm ascribed to oxygen vacancies in TTCP host. The emission intensity of oxygen vacancies decreases along with the increasing of Tm 3+ doping concentration due to the substitution of Ca 2+ and oxygen vacancies sites by Tm 3+ ions. For Tm 3+ and Eu 2+ co-doped TTCP phosphors, the blue emission intensity (458 nm) of Tm 3+ ions obviously decreased and the red emission intensity (624 nm) with of Eu 2+ ions increased due to Eu 2+ doping. The cross-relaxation from Tm 3+ to Eu 2+ ions was further demonstrated by the decay times of TTCP: 0.03 Tm 3+ , yEu 2+ phosphors monitoring the emission peak at 458 nm. Further, Tb 3+ ions were also introduced in the TTCP phosphor for a green emission and Tb 3+ singly-doped TTCP phosphor displays the emission peaks at 488 nm and 545 nm due to the typical 5 D 4 → 7 F 5 and 5 D 4 → 7 F 5 transition of Tb 3+ ions, respectively. Finally, TTCP: Tm 3+ , Tb 3+ , Eu 2+ phosphor was obtained and emitted the white light with the blue (458 nm), green (545 nm), and red (603 nm) emission bands under excitation of 352 nm. Especially, white light with tunable color temperature (3000 K–6000 K) and high color rendering index (Ra > 90) can be easily acquired. A neutral white light with high color rendering index (Ra 91.1) can be achieved for the TTCP: 0.03 Tm 3+ , 0.25 Tb 3+ , 0.004Eu 2+ phosphor.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Wei Zhu,Jialing Zhou,Feifei Huang,Renguang Ye,Youjie Hua,Shiqing Xu
The color rendering index (CRI) of white light-emitting diodes (LEDs) is very important for lighting quality. Currently, high-CRI white LEDs are typically fabricated by combining multiple-color phosphors. Therefore, the realization of multipeak-emission phosphors in a single phosphor is valuable. The Sr 2 LiAlO 4 : Eu 2+ phosphor exhibits an obvious double-peak emission in the yellow-green spectral range and has excellent luminescence properties , suggesting its potential application in white LEDs. In this study, a series of Sr 2 LiAlO 4-1.5 x N x : Eu 2+ ( x = 0–0.7) phosphors were successfully synthesized by introducing N 3− ions to replace O 2− ions. The luminescence intensity was significantly enhanced by increasing the N 3− concentration. Upon reaching a concentration of 0.7, the intensity of the yellow emission exceeded that of the green emission, indicating a shift in emission color from green to yellow. The emission peak of the Sr 2 LiAlO 2.95 N 0.7 : Eu 2+ phosphor is at 568 nm, which exhibited broader yellow light emission. Finally, Sr 2 LiAlO 2.95 N 0.7 : Eu 2+ was fabricated with a CaAlSiN 3 : Eu 2+ red phosphor on 450 nm blue LED chips. The fabricated white LEDs was observed to be white light with a high CRI of 92.1 and an adjustable color temperature (4938-6665k), showing its potential application in white LEDs.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Siping Wang,Zhaoyang Chen,Shala Bi,Zuyang Gao,Houjin Hu,Yi Liu,Bolong Zhang
Developing luminescent materials with lower cost and higher temperature sensitivity can provide more options for achieving precise optical thermometry. Therefore, the Tb 4 O 7 and Eu 2 O 3 co-doped BaO-ZnO-P 2 O 5 -B 2 O 3 glasses for optical thermometry were designed and synthesized using a high-temperature melting and quenching method. Due to the low optical basicity and the formation of defects of the glasses, the coexistence of Eu 2+ and Eu 3+ ions was achieved without the reducing agent. In Eu 2 O 3 doped glasses, the relative content variation of Eu 2+ and Eu 3+ ions was analyzed using high-resolution X-ray photoelectron spectroscopy. Emission spectra and fluorescence lifetimes confirmed the effective energy transfer processes between Eu 2+ and Tb 3+ or Tb 3+ and Eu 3+ , which play critical roles in the tunable white emission properties of the material. In the temperature-dependent fluorescence spectra, Eu 2+ ions exhibit significant thermal quenching behavior, which is key to achieving higher temperature sensitivity in optical thermometry. The Eu 2+ /Tb 3+ /Eu 3+ co-doped glasses were investigated for their optical temperature sensing behavior, utilizing the fluorescence intensity ratio techniques, within the temperature range of 273 K–498 K. The maximum absolute (at 498 K) and relative (at 273 K) sensitivity based on the fluorescence intensity ratio, were observed for Eu 2+ /Eu 3+ pairs were 0.145 K −1 and 1.46 % K −1 , respectively, outperforming the conventional Tb 3+ /Eu 3+ combination. Additionally, no significant fluctuation occurred during the repeated experiment. This work demonstrates that Eu 2+ /Tb 3+ /Eu 3+ co-doped BaO-ZnO-P 2 O 5 -B 2 O 3 glasses could be considered a promising candidate for optical thermometry.
研究领域:
材料科学
·
光学
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高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Dan Zhang,Xiangting Zhang,Zhengce An,Rujia Dong,Zhan Shi,Yanhua Song,Haifeng Zou
Here, the crystal structure, phase analysis, site occupancy, and luminescence properties of NCMP:Eu2+,Tb3+,Mn2+ have been studied for the first time. Under 335 nm ultraviolet excitation, the NCMP:Eu2+ phosphors show narrow-band blue emission. In addition, we discuss the reason for a continuous red shift for the emission spectra of NCMP:xEu2+ by raising the x value. The efficient ET processes of Eu2+ → Tb3+ and Eu2+ → Mn2+ were investigated by the luminescence spectra and decay curves. The ET efficiencies reach 92.58% at y = 0.15 for NCMP:0.01Eu2+,yTb3+ and 99.85% at z = 0.15 for NCMP:0.01Eu2+,zMn2+ phosphors, respectively. The efficient energy transfer processes greatly improve the quantum efficiency, luminous intensity, and thermal stability. Bright green and red emissions can be realized through changing the related ratio of Eu2+, Tb3+, and Mn2+. In addition, the excellent performance of the prepared white LED lamps utilizing a 385 nm chip combined with our prepared NCMP:Eu2+,Tb3+/Mn2+ phosphors indicates that NCMP:0.01Eu2+,yTb3+ and NCMP:0.01Eu2+,zMn2+ phosphors can be potential green and red phosphors for white LEDs.
研究领域:
材料科学
·
光学
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Shuai Huang,Mengmeng Shang,Yu Yan,Peipei Dang,Jun Lin
Co-doping mixed-valence Eu2+/3+ in a single-phase phosphor is an efficient method to realize the emission color regulation, which holds great potential for anticounterfeiting and ratiometric temperature sensing. Here, the mixed-valence Eu-doped Sr1.95+xLi1–xSi1–xAlxO4F (0 ≤ x ≤ 0.25) phosphors were designed and prepared under a reducing atmosphere. The correlation of local phase structures and luminescence properties was discussed. Replacing Si4+–Li+ ion pairs with Al3+–Sr2+ ion pairs compresses the Sr sites occupied by Eu2+, and it stabilizes Eu3+ in a reducing atmosphere and leads to the coexistence of Eu2+ and Eu3+ in single-phase Sr1.95+xLi1–xSi1–xAlxO4F:0.05Eu (0 ≤ x ≤ 0.25) phosphors. Based on the wavelength-dependent luminescence color behaviors of Sr1.95+xLi1–xSi1–xAlxO4F:0.05Eu phosphors, the fluorescent anticounterfeit papers/patterns containing Sr1.95+xLi1–xSi1–xAlxO4F:0.05Eu phosphors were the same as ordinary paper under ambient conditions. However, the hidden colors or images can be read out with green-orange luminescence under 365/300 nm light excitation. Benefiting from the diverse thermal response emission behaviors of Eu2+ (530 nm) and Eu3+ (703 nm), Sr1.95+xLi1–xSi1–xAlxO4F:0.05Eu phosphors exhibit temperature sensing performances, with the maximum absolute and relative sensitivity being 0.0294 K–1 at 573 K and 0.83% K–1 at 348 K. More importantly, Sr1.95+xLi1–xSi1–xAlxO4F:0.05Eu phosphors showed excellent stability in humid, acid, and alkali environments, which contributed to applying mixed-valence Eu2+/3+-doped Sr1.95+xLi1–xSi1–xAlxO4F to the fields of multicolor anticounterfeiting and noncontact optical thermometry.
研究领域:
材料科学
·
光学
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高影响因子
Laser & Photonics Reviews
·
2021
·Vol. 15
·期 11
·2100392
·
IF 13.138
Jianwei Qiao,Yayun Zhou,Maxim S. Molokeev,Qinyuan Zhang,Zhiguo Xia
It remains a critical challenge to develop narrow-band emitters for wide color gamut displays. Herein, it is designed by the selective site occupancy engineering and an unprecedented narrow-band green-emitting phosphor is prepared through chemical substitution. By introducing Ga 3+ ions into Sr 2 LiAlO 4 :Eu 2+ phosphor, the distribution of Eu 2+ ions in Sr1 and Sr2 sites is effectively controlled, and only one type of luminescent centers Eu 2+ (Sr1) is remained in Sr 2 LiAl 0.6 Ga 0.4 O 4 :Eu 2+ due to the compression effect of Sr2O 8 polyhedra. Sr 2 LiAl 0.6 Ga 0.4 O 4 :Eu 2+ phosphor presents an extremely narrow-band green emission centered at 512 nm with a full-width at half-maximum of only 40 nm. The wide color gamut (107% National Television System Committee) of the as-fabricated white liquid crystal displays and the vivid figures captured from the projector demonstrate the potential application of narrow-band emitter for wide-color gamut displays. This work provides the design principles of realizing narrow-band emission by selective site occupancy engineering and can set the stage for the exploring of Eu 2+ -activated phosphor for high definition displays.
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高影响因子
CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Yi Wei,Ling Cao,Lemin Lv,Guogang Li,Jiarui Hao,Junsong Gao,Chaochin Su,Chun Che Lin,Ho Seong Jang,Peipei Dang,Jun Lin
Highly efficient phosphor materials with superior thermal stability are indispensable for phosphor-converted white light-emitting diodes (pc-WLEDs) solid state lighting. In order to obtain a high quality warm white light, near-ultraviolet (n-UV) chips combined with trichromatic phosphors have be extensively studied. Among them, the development of efficient blue phosphor remains a challenging task. In view of the close correlation between 5d–4f transitions of rare earth ions and the coordination environment of host lattice, many studies have been dedicated to improving the photoluminescence performances by modifying the lattice coordination environment including the lattice rigidity and symmetry. In this work, we reported highly efficient blue-emitting Eu2+-doped BaAl12O19 (BAO) phosphors with excellent thermal stability, which were prepared via the traditional high-temperature solid state reaction routes. According to the X-ray powder diffraction (XRD) Rietveld refinement analysis, BAO owned a highly symmetric layer structure with two Ba polyhedrons, marked as Ba(1)O9 and Ba(2)O10, respectively. The diffuse reflectance spectra revealed the optical band gap to be 4.07 eV. Due to the suitable optical bandgap, the Eu2+ ions could realize a highly efficient doping in the BAO matrix. The photoluminescence excitation (PLE) spectra for as-prepared BAO:Eu2+ phosphors exhibited a broad absorption band in the region from 250 to 430 nm, matching well with the n-UV LED chip. Under the UV radiation, it is highly luminous (internal quantum yields (IQYs) = 90%) with the peak around 443 nm. Furthermore, the color purity of BAO:Eu2+ phosphors could achieve 92%, ascribing to the narrow full width at half-maximum (fwhm = 52 nm), which was even much better than that of commercially available BAM:Eu2+ phosphor (color purity = 91.34%, fwhm = 51.7 nm). More importantly, the as-prepared BAO:Eu2+ phosphor showed extra high thermal stability when working in the region of 298–550 K, which was a bit better than that of commercial BAM:Eu2+ phosphors. According to the distortion calculation of Ba crystallographic occupation, the superior thermal stability could be attributed to the highly symmetric crystal structure of BAO host. In view of the excellent luminescence performances of BAO:Eu2+, it is a promising blue-emitting phosphor for n-UV WLED.
研究领域:
材料科学
·
光电子学
·
荧光粉化学
·
固态照明
·
发光材料
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 55
·13819-13827
·
IF 5.236
Pan Liang,Wen-Li Lian,Zhi-Hong Liu
Highly efficient inorganic phosphors are crucial for solid-state lighting. In this paper, a new method of low-temperature self-reduction was used for preparing a highly efficient deep blue-emitting phosphor of Ca[B 8 O 11 (OH) 4 ] : Eu 2+ (CBH : Eu 2+ ). The crystal structure, morphology, chemical state, and photoluminescence (PL) properties of the CBH : Eu 2+ phosphor have been investigated. By using the screened hybrid function (HSE06), the band gap ( E g ) of CBH was calculated to be 7.48 eV, which is a necessary condition for achieving high quantum yield phosphors. The experiment results show that almost all the added raw materials of Eu 3+ can be reduced to Eu 2+ in CBH crystal under a non-reducing atmosphere. The CBH : Eu 2+ phosphor shows a broad excitation spectrum centered at 277 and 327 nm in the range of 220 to 400 nm, and a narrow-band emission spectrum centered at 428 nm in the range of 400 to 500 nm, with a full width at half maximum (fwhm) of 42.35 nm. Under UV radiation, the CBH : 2 %Eu 2+ exhibits high photoluminescence quantum yield (PLQY=95.0 %), high external quantum efficiency (EQE=31.1 %), and ultra-high color purity (97.6 %). The PL intensity of CBH : 2 %Eu 2+ remains 62.6 % of the initial intensity at 150 °C. Finally, the white light-emitting diodes (WLED) fabricated by CBH : 2 %Eu 2+ , excited by a 365 nm chip, presents outstanding performances with a luminous efficacy (LE) of 13.9 lm/W, a color rendering index (CRI) of 89.4, and a correlated color temperature (CCT) of 5825 K. The above results show that CBH : Eu 2+ can be used as a promising blue phosphor for WLED. This new method of low-temperature self-reduction can be applied to design and prepare other new types of highly efficient phosphors. Graphical Through a new method of low-temperature (only 350 °C) self-reduction, a highly efficient deep blue-emitting phosphor Ca[B 8 O 11 (OH) 4 ] : Eu 2+ was prepared, with a high PLQY of 95 % and a color purity of 97.6 %. Then, a WLED fabricated by the as-prepared CBH : 2 %Eu 2+ presents outstanding performance with a luminous efficacy (LE) of 13.9 lm/W, a color rendering index (CRI) of 89.4, and a correlated color temperature (CCT) of 5825 K.
研究领域:
材料科学
·
光学材料
·
固态照明
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荧光粉化学
·
发光学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Yawen Deng,Jianwei Qiao,Dehong Li,Qiufeng Shi,Haijie Guo,Lei Wang,Chengyan Gao,Zhiguo Xia
Highly efficient Eu 2+ -activated phosphors are indispensable for solid-state lighting, yet the parasitic Eu 3+ emission remains a significant efficiency killer. Herein, we report a robust strategy to suppress Eu 3+ formation in Li 2 CaSiO 4 :Eu 2+ via a heterovalent substitution strategy by combining a two-step sintering process with charge compensation. We effectively promote the Eu 3+ →Eu 2+ reduction, boosting the external quantum efficiency (EQE) from 22% to 60%, and the deep defect levels induced by Si 4+ -P 5+ heterovalent substitution impart superior thermal stability to Li 2 CaSi 0.96 P 0.04 O 4 :Eu 2+ (94%@423 K), while retaining a remarkable 98% of its initial intensity after 30 days of water immersion. The as-fabricated phosphor-converted light-emitting diodes achieve a high color rendering index ( R a = 90.6) and a 50% reduction in blue-light hazard, demonstrating great potential for healthy illumination. Notably, this Eu 2+ stabilization strategy also effectively enhances the emission intensity of Li 2 CaGeO 4 :Eu 2+ and Li 2 MSiO 4 :Eu 2+ (M = Sr, Ba), thus establishing a general paradigm for the rational design of high-performance phosphors for next-generation light sources.
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高影响因子
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