ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 5
·055011
·
IF 2.07
Jian Zhang,Ming Wang,Zhiyong Fang,Xiaohui Lai,Zhiqiang Zhong,Rui Zhang
Bi3+-activated luminescence materials have gained growing attentions for optoelectronic applications. In this work, a novel BaLu2MgGa2Si2O12: Bi3+ garnet phosphor was synthesized through a traditional high-temperature solid phase reaction method. The crystal structure was ascertained through X-ray diffraction analysis and Rietveld structural refinement. The particle morphology and constituent elements distributions were investigated through scanning electron microscope and element mapping. Excited at 330 or 370 nm, the phosphors exhibit two emission peaks located at 413 and 495 nm, which is ascribed to the allowed transitions of Bi3+: 3P1 → 1S0. The luminescence intensity reaches the maximum at the 4 mol% Bi3+ doping content, and the emission color is easily manipulated by tuning the excitation wavelength. Besides, the luminescence intensity at 150 ℃ remains 80% of that at room temperature. These results suggest that the novel phosphors have promising application in the near-UV excited white LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
OPTIK
·
2023
·
IF 3.1
Shan Liu,Mingxia Lv,Jun Zhou,Yaohui Zhu,Rong Hu,Xiong Li,Denghui Xu
A series of CaLa 1- x LiTeO 6 : x Dy 3+ phosphors were synthesized via a conventional solid-state reaction method, and the effects of different Dy 3+ doping concentrations on the luminescence properties of the phosphors were studied. The excitation spectrum indicated that these synthesized phosphors had strong absorption bands in near-ultraviolet (n-UV) region in the range from 300 to 500 nm. There were two sharp emission peaks in the visible region, which were located at 483 nm, 574 nm, corresponding to transitions of 4 F 9/2 → 6 H 15/2 (magnetic dipole transition) and 4 F 9/2 → 6 H 13/2 (electric dipole transition), respectively. The phosphor CaLa 0.95 LiTeO 6 :0.05Dy 3+ shows superior thermal stability. When the temperature rises to 425 K, the luminous intensity remains at 79% compared with the initial intensity of 300 K. These results demonstrate that the CaLa 1- x LiTeO 6 : x Dy 3+ phosphors have great potential as a single-phase luminescence material for near-ultraviolet (n-UV) excitation.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Peng Du,Weiguang Ran,Yafei Hou,Laihui Luo,Weiping Li
The Eu3+-activated NaGdF4 nanorods were achieved through a simple precipitation procedure at ambient temperature. With the irradiation at 396 nm, the designed nanorods exhibited visible red light with admirable color purity of 90.5% and the optimal doping concentration was 50 mol %. The concentration quenching mechanism was revealed to be decided by dipole–quadrupole interaction and the critical distance was 11.14 Å. The optical transition parameters, which were estimated from Judd-Ofelt theory, of the Eu3+ ions were obtained to confirm its local symmetry behaviors. Moreover, the emission spectra of the designed nanorods at diverse temperatures were used to identify its thermal quenching performance. In comparison with that of the Y2O3:Eu3+ compound, the emission intensity of the Eu3+-activated NaGdF4 nanorods with optimum doping content was 2.47 times higher and its internal quantum efficiency was around 62.3%. Furthermore, the developed white light-emitting diode device, which was constructed by resultant nanorods, green-emitting phosphor (i.e., (Ba,Sr)2SiO4:Eu2+), blue-emitting phosphor (i.e., BaMgAl10O17:Eu2+), and a near-ultraviolet chip, exhibited admirable colorific properties (i.e., good color coordinates, low correlated color temperature, high color rendering index). These achieved features implied that the NaGdF4 nanorods doped with Eu3+ ions were sutiable red-emitting platforms for indoor illumination.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 35
·10802-10809
·
IF 6.641
Peng Du,Weiguang Ran,Weiping Li,Laihui Luo,Xiaoyong Huang
A series of NaTbF4 and Eu3+-activated NaTbF4 nanorods with high luminescent efficiency were designed by using an ingenious reaction technique at room temperature. The effect of the synthesis time on the morphology evolution of NaTbF4 nanorods was investigated. Moreover, the influences of the Eu3+ doping concentration on the crystal structure, morphology, electronic structure and photoluminescence properties of NaTbF4 nanorods were systematically studied. Near-ultraviolet (NUV) light was the proper excitation light source for the final products and the optimum Eu3+ doping concentration was 30 mol%. The critical distance of Eu3+ ions in the NaTbF4 host lattices was 11.42 Å and the concentration quenching mechanism was dominated by electric dipole–dipole interactions. The local symmetry properties of Eu3+ ions in the NaTbF4 host were explored by analyzing the optical transition parameters based on the Judd–Ofelt theory. The resultant nanorods not only exhibited splendid thermal stability but also had a high internal quantum efficiency of 50.2%. Additionally, the fabricated light-emitting diode (LED) device can emit glaring white light emission with admirable color properties (i.e., good color coordinates, high color rendering and low correlated color temperature) which slightly changed at high injection current. These achievements suggested that the Eu3+-activated NaTbF4 nanorods were promising red-emitting candidates for high-powered NUV-pumped white-LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zaichun Sun,Shaoyong Qin,Daichi Oka,Huijuan Zhang,Tomoteru Fukumura,Yuji Matsumoto,Bingchu Mei
Semitransparent and homogeneous bismuth oxychloride (BiOCl) thin films with (001) preferred orientation were synthesized on polycrystalline Sn:In2O3-glass substrates by mist chemical vapor deposition. The films showed photocathodic activity even under near-ultraviolet light within the band gap due to the in-gap states induced by oxygen vacancies. Higher synthesis temperatures resulted in a significant increase of photocurrent density under ultraviolet light. While the longer lifetime of photocarriers led to an increase of internal quantum efficiency, the larger band-edge absorption significantly contributed to the higher external quantum efficiency.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Linfang Ma,Yanan Li,Xiaoyi Liu,Shengda Liu,Guixia Liu,Dan Li,Jinxian Wang,Wensheng Yu,Xiangting Dong
The self-activated and rare earth Dy 3+ and Eu 3+ ions doped Na 2 YMg 2 V 3 O 12 phosphors with single garnet structure were obtained by using solid state reaction method. Self-activated Na 2 YMg 2 V 3 O 12 phosphors have a wide excitation band in near-ultraviolet range, Dy 3+ and Eu 3+ ions were co-doped in Na 2 YMg 2 V 3 O 12 host to broaden the excitation peak range of the phosphors. Using 365 nm near-ultraviolet light as the excitation wavelength, Na 2 YMg 2 V 3 O 12 :Dy 3+ ,Eu 3+ phosphors simultaneously emit sharp transition peaks of Dy 3+ ions at 487 nm and 576 nm, and red transition peaks of Eu 3+ at 595 nm, 611 nm and 635 nm. The energy transfer processes between VO 4 3− , Dy 3+ and Eu 3+ were discussed. The multicolor light emitting can be adjustable and white light can be realized due to the changing amount of the doped ions. Emission spectra dependent of temperature showed that Na 2 YMg 2 V 3 O 12 :Dy 3+ , Eu 3+ phosphors had good thermal quenching performance, indicating that the phosphors can be used in the field of near ultraviolet excited WLED.
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 COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaoyi Liu,Haiming Cheng,Bin Yue,Zhu Wen,Ying Jin,Guixia Liu,Shengda Liu,Dan Li,Jinxian Wang,Wensheng Yu,Xiangting Dong
Novel eye-sensitive Ba 3 Nb 2 O 2 F 12 (H 2 O) 2 :Tb 3+ green and Ba 3 Nb 2 O 2 F 12 (H 2 O) 2 :Mn 4+ red oxyfluoride phosphors with extremely strong absorption in the UV region were designed and synthesized by simple co-precipitation strategy. Particularly, Tb 3+ ions were doped in this matrix for the first time, which greatly improves their absorption efficiency in the near ultraviolet region (367 nm) and emits sharp green light (544 nm). In addition, the Ba 3 Nb 2 O 2 F 12 (H 2 O) 2 :Mn 4+ red phosphors have strong zero phonon line (ZPL) emission at 625 nm, which is conducive to improving the sensitivity of human eye and color purity. Meanwhile, the optical properties of the red phosphor are significantly enhanced via doping K + cations as charge compensators. Crystal field environment and nephelauxetic effect of the as-prepared phosphors before and after K + cation doping were systematically analyzed. Moreover, these synthesized red/green phosphors have good thermal stability and moisture resistance. Remarkably, the as-prepared Ba 3 Nb 2 O 2 F 12 (H 2 O) 2 :5%Mn 4+ or K 0.9 Ba 2.1 Nb 2 O 2 F 12 (H 2 O) 2 :5%Mn 4+ red phosphors can be directly mixed with the as-synthesized Ba 3 Nb 2 O 2 F 12 (H 2 O) 2 :13%Tb 3+ green phosphor coating on 365 nm near-ultraviolet LED chip to package WLED devices with excellent electroluminescence performance. These findings are conducive to opening an avenue for screening the unique structure of optical materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE ELECTRON DEVICE LETTERS
·
2023
·Vol. 44
·期 7
·1152-1155
·
IF 4.9
Weishuai Duan,Zhe Liu,Xinfa Zhu,Biao He,Chao Fan,Yonghui Zhang,Mengjun Wang,Hongxing Zheng,Erping Li
Near-ultraviolet (NUV) detectors based on two-dimensional (2D) materials have garnered considerable attention owing to their atomic-scale thickness, varied bandgap, and strong interaction with incident light. In this work, homostructures composed of tin disulfide/chromium–doped tin disulfide (SnS
2
/Cr–SnS
2
) were proposed for 405 nm near-ultraviolet detectors. Afterward, superlative detectors were fabricated through the employment of micro-mechanical exfoliation and polydimethylsiloxane-assisted dry-transfer methods, anchored by the SnS
2
Cr–SnS
2
homostructures. The detectors demonstrated exceptional detection performance for 405 nm NUV radiation with a significant responsivity of
$2.04\times 10^{{3}}\,\,\text {A}\cdot \text {W}^{-{1}}$
and a short response time of 8 ms, exceeding that of detectors based on most 2D materials and even commercial light detectors (Thorlabs FD11A–Si). The work presents an effective homostructure for high-performance SnS
2
-based detectors, thereby opening an opportunity for the utilization of SnS
2
in NUV detectors.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 12
·期 5
·3112-3120
·
IF 6.97
Li Li,Lei Wang,Chenglin Du,Zhongyuan Guan,Yinxiao Xiang,Wei Wu,Mengxin Ren,Xinzheng Zhang,Aiwei Tang,Wei Cai,Jingjun Xu
Strong coupling originating from excitons of quantum dots and plasmons in nanocavities can be realized at room temperature due to the large electromagnetic field enhancement of plasmons, offering building blocks for quantum information systems, ultralow-power switches and lasers. However, most of the current strong coupling effects were realized by the interaction between excitons and far-field light excited bright plasmon modes in the visible range. Beyond that, there is still a lack of direct imaging of polariton modes at the nanoscale. In this work, by using cathodoluminescence, ultrastrong coupling with Rabi splitting exceeding 1 eV between bonding breathing plasmons of aluminum (Al) metal–insulator–metal (MIM) cavities and excited states of CdZnS/ZnS quantum dots was observed in the near-ultraviolet (UV) spectrum. Further, the hybridization of the QDs excitons and bonding breathing plasmonic modes is verified by deep-subwavelength images of polaritonic modes in real-space. Analytic analysis based on the coupled oscillator model and full-wave electromagnetic simulations is consistent with our experimental results. Our work not only indicates the great potential of electron excited plasmon modes for strong coupling applications, but also extends the polaritonic frequency to the UV range with Al nanocavities.
研究领域:
光学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 5
·2718-2726
·
IF 2.956
Hong Chen,Yao Wang,Jianhui Lin,Minmin Shuai,Haidi Zhu,Wengong Zhang,Qidan Ling
Herein, a novel transparent phenyl vinyl silicone resin nanocomposite containing exfoliated fluorescent Eu-containing hydrotalcite-like compound (EFHSN) is developed to serve as a dual role of color conversion and encapsulation material. Excited by near-NUV light, the EFHSN emits a strong characteristic red light (614 nm). Meanwhile, the EFHSN shows not only excellent transparency ( T > 95%) in the UV-Vis region and high refractive index (1.46) but also superior thermal stability, which could meet the need of commercial encapsulation materials and optical application. Therefore, the EFHSN is expected to be used in InGaN-based NUV light-emitting diodes and flexible optoelectronic device.
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
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jianwei Dao,Zihao Han,Zhihao Jiang,Tiqun Wei,Junlin Xue,Bin Wang,Sicheng Yi,Liang Yang
Narrow-band red phosphors excited by near-ultraviolet light (n-UV) are significant for enhancing the R9 index and can produce high color rendering white LEDs. A range of KSr 1-x-y Ca y PO 4 :xEu 3+ red phosphors were synthesized by high-temperature solid-state reaction method. We investigated the effects of partially substituting Sr 2+ ions with Ca 2+ ions on the phosphors' crystal structure, photoluminescence and thermal stability. Significantly, incorporating Ca 2+ ions enhances the luminescent properties and thermal stability. Under n-UV light excitation, all samples exhibit red emission around 614 nm, corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. At the doping concentration of Eu 3+ ions (x = 0.08), an optimal KSr 0.52 Ca 0.4 PO 4 :0.08Eu 3+ (y = 0.4) sample was obtained. The excitation wavelength exhibited a slight violet shift from 398 nm to 396 nm. At 150 °C, the luminescence intensity of KSr 0.92 PO 4 :0.08Eu 3+ remains 80.1 % of its value at room temperature, while that of KSr 0.52 Ca 0.4 PO 4 :0.08Eu 3+ reaches 89.7 %. White LED device can be fabricated by combining the as-prepared KSr 0.52 Ca 0.4 PO 4 :0.08Eu 3+ red phosphor with commercial BaMgAl 10 O 17 :Eu 2+ blue and (Ba, Sr) 2 SiO 4 :Eu 2+ green phosphors, along with encapsulation using n-UV LED chip (395–400 nm). The device emits bright white light and exhibits a high color rendering index (Ra = 87.6, R9 = 89.8) and suitable correlated color temperature (CCT = 5523 K) at 300 mA drive current. The results demonstrate that this work provides new application prospects for the fabrication of high color rendering white LEDs using n-UV light.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Pengju Xia,Yifeng Lei,Wanyuan Li,Kaiting Wu,Chengyu Ni,Man Xu,Wubin Dai
With the growing public awareness of protecting vision and prevention of hazardous effects, there is much-needed research on a “healthy” full visible spectrum under near-ultraviolet (nUV) excitation in phosphor-converted white light-emitting diodes (pc-wLEDs) to fill the “cyan gap” and avoid employing a blue LED chip. Herein, a novel series of borosilicates Ba2CaB2Si4O14 (BCBS): Ce3+/Tb3+/Sm3+/Sr2+/Na+ phosphors, presenting color-tunable photoluminescence (PL), high quantum yield (QY), and thermal stability, were designed and synthesized via a facile solid-phase reaction. The Rietveld analyses, density functional theory (DFT) simulations, and theoretical calculations of bond energy together imply the site occupations of Ce/Tb/Sm on Ba2+/Ca2+ sites with a preferred location on Ca2+ over the Ba2+ site. The broad/bright cyan-PL from BCBS: Ce under nUV excitation is associated with the allowed f–d transitions of Ce3+ and dual-site occupancies. The forbidden f–f transitions of both the green-PL of Tb and the red-PL of Sm were insensitive to the site environment and helpful to PL color regulation. The cascading Ce → Tb → Sm energy transfer is confirmed, where Tb is regarded as an energy transfer (ET) bridge to avoid the metal–metal charge transfer (MMCT) effect. The introduction of Na+ as both flux and charge compensator is for the sake of decreasing defects from heterovalent substitutions and regulating morphology. Further incorporation of Sr2+ is to modulate the lattice environments of dopants for controlling the shift of PL. Finally, as a proof-of-concept implement, a pc-wLED assembled by BCBS: Ce/Tb/Sm/Sr/Na and an nUV LED chip via a remote “capping” packaging strategy show attractive performance.
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
危险品化学品经营许可证（带存储）