OPTICS EXPRESS
·
2025
·Vol. 33
·期 4
·8043-8054
·
IF 3.3
Mengjiao Li,Xiaoshuai Zhang,Xiaoyi Ma,Jia Li,Jie Gong,Panlai Li,Panlai Li,Xiaoyan Yu,Zixuan Wang,Chengrun Liu,Guodong Zhang,Guodong Zhang,Zhijun Wang,Zhijun Wang
To facilitate the development of near-infrared light sources for photovoltaic and night-vision lighting applications, it is crucial to obtain novel near-infrared emitting phosphors. Herein, a novel Eu2+-activated broadband near-infrared emitting phosphor CaScBO4: Eu2+ is reported. Under 558 nm light excitation, CaScBO4: Eu2+ exhibits broadband near-infrared emission centered at 780 nm with a full width at half maxima of 147 nm. The luminescence intensity is significantly enhanced by 7-fold through a cation modulation strategy using Ba2+ for Ca2+ substitution. The mechanism of the increase of the luminescence intensity is explained in detail by the change in the symmetric stretching force of the B-O bond before and after the substitution. Finally, the Ca0.85Ba0.15ScBO4: Eu2+ phosphor was encapsulated in a 558 nm chip to form a phosphor-converted light-emitting diode device, and exploratory experiments were performed to explore the applications in night vision lighting. The results show that the phosphor has great potential for application in the field of night vision lighting.
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
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-14
·
IF 4.259
Wang Baochen,Liu Yan-gai,Huang Zhaohui,Fang Minghao,Wu Xiaowen
Discovery of novel phosphors is one of the main issues for improving the color rendering index (CRI) and correlated color temperature (CCT) of white light-emitting diodes (w-LEDs). This study mainly presents a systematic research on the synthesis, crystal structure variation and photoluminescence tuning of novel (oxy)nitride solid solution Ca 3 Si 3− x
O 3+ x
N 4−2 x
: Eu 2+ phosphors. XRD refinements show that lattice distortion occurs when x value diverges the optimum one ( x = 1). The lattice distortion causes a widening of emission spectrum and an increase of Stokes shift (ΔSS), which leads to a bigger thermal quenching. With decrease of x value, the emission spectrum shows an obvious red-shift from 505.2 to 540.8 nm, which is attributed to the crystal field splitting. The enhanced crystal field splitting also broadens the excitation spectrum, making it possible to serve as the phosphor for near ultraviolet (n-UV) LEDs. A 3-phosphor-conversion w-LED lamp was fabricated with the as-prepared phosphor, which exhibits high CRI (Ra = 85.29) and suitable CCT (4903.35 K). All these results indicate that the Ca 3 Si 3− x
O 3+ x
N 4−2 x
: Eu 2+ phosphor can serve as the green phosphor for n-UV w-LEDs, with a tunable spectrum by controlling the crystal structure and morphology.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhiwei Xia,Yuhan Wang,Rujun Yang,Mengdi Xu,Cunjian Lin,Zhongyuan Li,Ying Lv,Xiaopeng Chi,Shihai You
The interstitial site engineering that purposely creates interstitial luminescent centers in suitable hosts has become an intriguing strategy in designing novel inorganic phosphors. However, effectively tuning the photoluminescence of interstitial activators remains tough challenging at this stage. Here, we demonstrate the effective modulation of interstitial luminescence in inorganic phosphor. In detail, the blue emission band ( λ em = 446 nm) of interstitial Eu 2+ doped α -cristobalite (SiO 2 :Eu 2+ ) is largely enhanced and broadened via a partial, aliovalent substitution of Si 4+ by Al 3+ . After introducing Al 3+ ions into SiO 2 lattice, the full width at half maximum of the blue emission band increase from 59 to 76 nm with a triple growth in quantum efficiency (10.82% → 35.56%). Moreover, the thermal stability improves significantly with a high emission retention of 60% at 325 °C (SiO 2 :0.06Al 3+ ,0.005Eu 2+ ), far higher than that of the parent SiO 2 :0.005Eu 2+ (30%). Encapsulating blue-emitting SiO 2 :Al 3+ ,Eu 2+ along with two commercial green and red phosphors on an ultraviolet LED chip ( λ em = 375 nm), a white LED device with high color rendering index (Ra > 90) was successful fabricated, showing the great potential of this phosphor for achieving high-quality white LED lighting. This study not only provides a promising bule emitter but also sheds light on modulating interstitial luminescence properties in inorganic phosphors.
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 LUMINESCENCE
·
2025
·
IF 3.6
Kuo Shen,Yahong Jin,Yanmei Li,Yihua Hu
Inorganic scintillator materials have garnered widespread attention due to their applications in high-energy X-ray detection and imaging. However, developing materials that possess both high thermal stability and the capability to provide high-resolution X-ray imaging remains a significant challenge in this field. This article reports the synthesis of Ba 1.31 Ca 0.69 SiO 4 inorganic scintillator materials doped with Eu 2+ and Dy 3+ through a high-temperature solid-phase method. Their structure, photoluminescent properties under visible light and X-ray excitation, and thermoluminescence characteristics were thoroughly characterized. Experimental results indicate that the material's traps were enriched through the aliovalent substitution of Dy 3+ , enhancing the afterglow at room temperature. Under 350 nm excitation, the material demonstrated excellent thermal stability (maintaining 90% of its intensity at 150 °C compared to 30 °C) and a high quantum efficiency (IQE = 96.64 %). Furthermore, under X-ray excitation, the material exhibits a high electron storage capacity, which can be read out under near-infrared light at 870 nm, and can be rapidly erased under heating conditions or under visible light at 470 nm. Finally, we prepared flexible films using the phosphor, demonstrating a spatial resolution of 11.9 lp/mm −1 under X-rays, as well as showcasing the real-time and delayed imaging capabilities of the flexible film under X-ray exposure.
研究领域:
材料科学
·
光学
·
医学影像
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 10
·6442-6452
·
IF 3.9
Jinlong Wang,Hao Song,Peipei Dong,Zihan Zhao,Yanjie Zhang
Nowadays, considerable efforts have been extensively devoted to explore a general strategy for improving the color uniformity and thermal stability of phosphors, which is vital for its applications in health and comfort lighting. In this study, the SrSi2O2N2:Eu2+/g-C3N4 composites were successfully prepared via a facile and effective solid-state method to improve their photoluminescence properties and thermal stability. The coupling microstructure and chemical composition of the composites were demonstrated by high-resolution transmission electron microscopy (HRTEM) and EDS line-scanning analyses. Notably, the dual emissions at ∼460 nm (blue) and ∼520 nm (green) were observed for the SrSi2O2N2:Eu2+/g-C3N4 composite under near-ultraviolet (NUV) excitation, attributed to the g-C3N4 and 5d–4f transition of Eu2+ ions, respectively. The coupling structure will be beneficial to the color uniformity of the blue/green emitting light. Further, SrSi2O2N2:Eu2+/g-C3N4 composites exhibited a similar photoluminescence intensity compared with the SrSi2O2N2:Eu2+ phosphor even after thermal treatment at 500 °C for 2 h due to the protection of g-C3N4. The decreased decay time (1798.3 ns) of green emission for SSON/CN compared with SSON phosphor (1835.5 ns) indicated that the coupling structure suppressed the non-radiative transition and improved photoluminescence properties and thermal stability. This work provides a facile strategy to construct SrSi2O2N2:Eu2+/g-C3N4 composites with coupling structure for improved color uniformity and thermal stability.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qinghai Sun,Zhibo Zheng,Xiaolu Yang,Yanxia Zhao,Zhou Luo,Chao Wang,Yanhua Song,Haifeng Zou,Shihou Sheng
Herein, a variety of single-phase full-spectrum emission phosphors doped with Eu 2+ were synthesized. Under the 350 nm excitation, as K + and Y 3+ were introduced into Ca 10 Na(PO 4 ) 7 (CNP):1.5%Eu 2+ , respectively, the emission color of Ca 9.85 K y Na (1- y ) ( PO 4 ) 7 :1.5%Eu 2+ (0 ≤ y ≤ 1.0) was tuned from yellow to cyan, while that of Ca (9.85- z ) NaY 0.667 z (PO 4 ) 7 :1.5%Eu 2+ (0 ≤ z ≤ 1.0) was tuned from yellow to green. The internal quantum yield (QY) of Ca 9·85 K 0·4 Na 0·6 (PO 4 ) 7 (CKNP):1.5%Eu 2+ and Ca 9·45 NaY 0·267 (PO 4 ) 7 (CNYP):1.5%Eu 2+ reached 47.47 % and 27.11 %, respectively. The introduction of K + or Y 3+ made Eu 2+ selectively occupy the Ca sites and led to changes in the local environment of Eu 2+ , allowing for spectral tuning emission. In addition, the luminescence intensity of the samples retained 54.59 % and 31.34 % of their room temperature values. Eventually, two white light emitting diode (WLED) devices were fabricated, combining the synthesized white emitting phosphors with 365 nm ultraviolet (UV) chips. They exhibited high color rendering indices of 84.7 and 77.0, along with low correlated color temperatures of 5435 K and 5023 K. The Commission Internationale de L'Eclairage (CIE) color coordinates were (0.3349, 0.3975) and (0.3517, 0.4366), respectively. The results pointed to the phosphors' potential suitability for use in the WLED sector.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Xiaoshuai Zhang,Xi Wang,Tao Yin,Xuping Han,Panlai Li,Xiaoyan Yu,Zixuan Wang,Chengrun Liu,Zhijun Wang
The market demand for environmentally controlled agricultural indoor lighting is gradually increasing due to environmental pollution and drastic changes in the natural climate. Generally, matrix K 3 YSi 2 O 7 (phase 1) is difficult to synthesize compared to K 3 YSi 2 O 7 (phase 2), which has been illustrated by theoretical calculations. In this paper, large quantities of pure phase K 3 YSi 2 O 7 (phase 1) matrix were obtained by the substitution engineering strategy (Ca 2+ →Y 3+ ). Subsequently, Eu 2+ was doped to obtain a thermally stable ultra-wideband deep red light-emitting phosphor with an emission band centered at 721 nm and a full width at half maximum of 186 nm under 450 nm light excitation. It is noteworthy that compared with K 3 YSi 2 O 7 :Eu (phase 2), K 3 Ca 0.3 Y 0.7 Si 2 O 7 :Eu 2+ (phase 1) is superior in terms of emission wavelength, full width at half maximum, and thermal stability. Furthermore, the spectrum resemblance between its emission spectrum and the photosensitive pigment P fr was calculated to be 97.5%, which set the stage for subsequent plant lighting applications. Finally, light-emitting diode devices were prepared using K 3 Ca 0.3 Y 0.7 Si 2 O 7 :Eu 2+ phosphor for plant lighting experiments, and plants grown under deep red light emitting diode light show more luxuriant growth. The results show that the phosphor K 3 Ca 0.3 Y 0.7 Si 2 O 7 :Eu 2+ has promising applications in indoor plant culture. Meanwhile, the successful implementation of ion substitution engineering also provides a new strategy for transitions in host systems.
研究领域:
材料科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Yanying Bi,Hang Yang,Xiaohan Yun,Hang Zhang,Xiangjie Ma,Guogang Li,Yujun Liang,Yongjun Chen
Currently, the development of highly efficient emission tunable phosphor materials is necessary for improving the lighting quality of UV light based white emitting diodes (WLEDs). Herein, a series of new blue-emitting Ca 7 (Mg, Zn) 2 P 6 O 24 : Eu 2+ (CM/ZP: Eu 2+ ) phosphors were successfully synthesized through a high temperature solid phase reaction process. Interestingly, through constructing Ca 7 (Mg, Zn) 2 P 6 O 24 : Eu 2+ solid solutions based on a complete substitution of Mg 2+ by Zn 2+ , the controllable blue-shift emission from 441 to 418 nm could be realized. This result could be attributed to the selective occupation of different Ca 2+ ions for Eu 2+ ions due to distortion of coordination polyhedron. The corresponding full width at half maximum (FWHM) exhibits a gradual narrowing from 66 to 27 nm after [Zn→Mg] replacement, and the color purity of Eu 2+ emission in Ca 7 Zn 2 P 6 O 24 (CZP) could reach 93.2%. Finally, the thermal quenching resistance of the as-prepared Ca 7 (Mg, Zn) 2 P 6 O 24 : Eu 2+ phosphors show remarkably excellent performance. Moreover, the thermal stabilities working at 150 °C of CMZP: Eu 2+ were gradually improved from 71% for CZP: Eu 2+ to 97% for CMP: Eu 2+ of original photoluminescence intensity. Generally, the cation substation induced selective occupation of Eu 2+ to control FWHM is an efficient design to achieve emission-tunable phosphors, and the developed narrow-band Ca 7 (Mg, Zn) 2 P 6 O 24 : Eu 2+ blue-emitting phosphors could serve as potential blue phosphors for WLEDs application.
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
·
2018
·Vol. 6
·期 13
·3346-3351
·
IF 5.976
Jun Wan,Yuting Zhang,Yuan Wang,Ronghua Ma,Yimin Wu,Xvsheng Qiao,Xianping Fan
Commercial LED phosphors are usually prepared by a conventional solid-state reaction method and a subsequent ball milling process, which often results in non-uniform size distributions, irregular shape and impurity contamination of the phosphors. In this work, the SrAl2O4:Eu2+ cage-like microspheres with a uniform size distribution and excellent photoluminescence (PL) quantum yield (QY) are prepared by an epoxide-driven sol–gel route and subsequent heat treatment in a reducing atmosphere. This unique cage-like microstructure not only makes better use of the excited light but also significantly increases the PL quenching concentration of the Eu2+ ions. The optimum internal QY of the SrAl2O4:Eu2+ cage-like microspheres is measured to be up to 94.94%, much higher than the highest internal QY (55%) of the SrAl2O4:Eu2+ phosphors reported so far. The approach may be readily applied to prepare other lanthanide ions doped cage-like microspheres, implying a new route for preparing highly efficient PL phosphors with regular shape and uniform particle size.
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
·
2022
·Vol. 49
·期 7
·10273-10279
·
IF 5.532
Daiyuan Liu,Ting Wang,Yichun Liu,Chao Wang,Zhichao Liu,Xiaodie Zhu,Ya Liu,Jian Zhang,Zhaowei Teng,Yang Zhong,Yakovlev Alexey Nikolaevich,Xuhui Xu
The photoluminescence behavior of inorganic phosphors is generally influenced by thermal stability, which determines the luminescence efficiency of the corresponding devices. Here, a series of Eu 2+ , Mn 2+ co-doped LiAl 5 O 8 blue-green-emitting phosphors with thermal robust are successfully fabricated. The concentration-dependent emission spectra and the decay curves of the as-obtained LiAl 5 O 8 : Eu 2+ , Mn 2+ samples manifest the occurrence of the energy transfer from Eu 2+ to Mn 2+ ions via dipole-dipole interaction, and the corresponding emitted colors are gradually modulated from blue to green under the excitation of 310 nm. Moreover, the zero-thermal-quenching luminescence is observed when the operation temperature is up to 423 K, which is attributed to the energy release from the trapping centers to emitting centers (Eu 2+ and Mn 2+ ) at high temperature. Furthermore, a warm white light-emitting diodes (WLEDs) device with correlated color temperature of 5061 K, a color rendering index of 80.6 and long-term stability is fabricated by combining UV LED chip (λ ex = 310 nm), as-obtained LiAl 5 O 8 : Eu 2+ , Mn 2+ phosphor, commercially available red phosphor and green phosphor. These results prove the potential application of the as-obtained LiAl 5 O 8 : Eu 2+ , Mn 2+ phosphor for UV-pumped WLEDs devices.
研究领域:
材料科学
·
发光材料
·
固态化学
·
光电子学
·
无机化学
·
器件物理
·
纳米材料
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Haitao Lv,Yanmin Wang,Zhidong Pan
(Eu 2+ , Dy 3+ )-co-doped strontium/calcium aluminate phosphor as one of color-tunable emission materials was synthesized via solid-state reactions at 1300 °C for 3 h. Effect of strontium/calcium ratio on the crystal structure, particle size/morphology as well as photo- and mechano-luminescent properties of the phosphors was investigated by X-ray diffraction, Rietveld method, scanning electron microscopy with energy dispersive X-ray spectroscopy, and spectrophotometry . The mechano-luminescent properties were measured by two mechanical stress instruments (i.e., impact and compression), respectively. The results reveal that a mixed phase with SrAl 2 O 4 and CaAl 2 O 4 has a monoclinic structure with a space group P2 1 for Sr x Ca 1-x Al 2 O 4 : 0.001Eu 2+ , 0.001Dy 3+ phosphor (x = 0.2–0.8), resulting in the change of crystallographic parameters due to different calcium/strontium ratios. According to the results of photo- and mechano-luminescent characterizations, SrAl 2 O 4 : 0.001Eu 2+ , 0.001Dy 3+ phosphor (x = 1.0) has a superior mechano-luminescent property rather than CaAl 2 O 4 : 0.001Eu 2+ , 0.001Dy 3+ phosphor (x = 0), although they both have photo-luminescent properties. Furthermore, the CEI diagram indicates that the emission color of the phosphor can be tuned from blue to bluish white and eventually to green, and the mechano-luminescent peak appears and becomes intense as Sr 2+ ions substitute for Ca 2+ ions in the phosphor gradually. In addition, the photo- and mechano-luminescent mechanisms of phosphor were also discussed.
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 RARE EARTHS
·
2021
·Vol. 40
·期 11
·1691-1698
·
IF 3.712
Qingsong Hu,Zaifa Pan,Guijie Liang
White light-emitting diodes (WLEDs) fabricated by single-phase full color emitting phosphor are an emerging solution for health lighting. The crystallographic site occupation of activators in a proper host lattice is crucial for sophisticated design of such phosphor. Here, we report a high quality white light-emitting phosphor Ba 2 Ca(BO 3 ) 2 :Ce 3+ (K + ),Eu 2+ ,Mn 2+ with spectral distribution covering whole visible region. Blue light emission originates from Ce 3+ ions occupying preferentially Ba 2+ site by controlling synthesis conditions. Green and red lights are obtained from Eu 2+ occupying Ba 2+ (and Ca 2+ ) site and Mn 2+ occupying Ca 2+ site, respectively. In this triple-doped phosphor, strong red emission with a low concentration of Mn 2+ is realized by the efficient energy transfer from Ce 3+ and Eu 2+ to Mn 2+ . Furthermore, high quality white light is accomplished by properly tuning the relative doping amount of Ce 3+ (K + )/Eu 2+ /Mn 2+ based on efficient simultaneous energy transfer. The results indicate that Ba 2 Ca(BO 3 ) 2 :Ce 3+ (K + ),Eu 2+ ,Mn 2+ is a promising white light-emitting phosphor in WLEDs application.
研究领域:
材料科学
·
无机化学
·
发光材料
·
固态照明
·
能源材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）