OPTICAL MATERIALS
·
2012
·
IF 2.023
Chundong Li,Jinpeng Lv,Zhiqiang Liang,Shulong Yao
The blue band optical absorption and green luminescence of ZnO phosphors doping with aluminum are systematic studied. The Al content is varied from 0.01 at.% to 1 at.%. SEM images illustrated that Al doping can effectively suppress the ZnO grain growth. XRD results clearly manifest that the Al solubility limit in ZnO is around 0.1 at.%. It is also found that the E 1 (LO) vibration mode in the Raman spectra exhibits a good correlation with the blue band optical absorption and green photoluminescence. The results revealed that both V O 0 and V O + can give rise to the E 1 (LO) vibration mode. We conclude that the V O and O i defects are the dominant reason of the green photoluminescence in ZnO phosphors, in oxygen-deficient and oxygen-rich conditions, respectively.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Haowei Lin,Kai Chen,Mingke Li,Beibei Ji,Yaohui Jia,Xinyu Liu,Jinling Li,Weiqiang Song,Chunlong Guan
We demonstrate that a novel photodetector is constructed by CdS/poly(p-phenylene vinylene) (PPV) homogeneous hybrid nanowire arrays via a simple template-assisted electrochemical codeposition approach. Owing to the well-matched energy levels between CdS and PPV, the recombination of photogenerated electrons and holes in CdS/PPV hybrid nanowire arrays is greatly inhibited. It is found that the homogeneous hybrid nanowire arrays exhibit remarkably enhanced photoelectric response and the ON/OFF ratio by 17 times compared to the individual CdS component. More importantly, the CdS/PPV hybrid nanowire arrays are observed with significant spectral selectivity especially for green light under 545 nm. In addition, a straight linear relationship is obtained between the ON/OFF ratios and the illumination intensities, implying that the quantitative detection of illumination intensity can be achieved. The new as-prepared homogeneous hybrid organic/inorganic semiconductor nanowire arrays have a bright prospect for applications in high-sensitivity and high-speed green photodetectors.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yuqin Guo,Guojuan Wang,Linrong Qiu,Chengwu Hong,Shuxing Li,Rong-Jun Xie
Using blue lasers to excite green-emitting phosphors offers a compelling solution to address the “green gap” issue, providing a high-brightness green light source for underwater wireless optical communication (UWOC). However, current green-emitting phosphors show poor light conversion efficiencies or inadequate luminance saturation thresholds, impeding the development of brighter green light sources. Herein, the porous Lu 3 Al 5 O 12 :Ce phosphor ceramics are designed, which shows no change in quantum efficiency (82%) even after 6000 h of extended aging. This design results in a substantial improvement in light conversion efficiency (61.6%), luminous efficacy (286 lm·W⁻¹), and an exceptional luminance saturation threshold of 33 W·mm⁻ 2 , culminating in a maximum green light flux of 4720 lm. Moreover, the high-directionality green light source device has been fabricated that achieves an illuminance of 6081 lx at a distance of 10 meters (15.0 W blue laser irradiation) with the electro-optical conversion efficiency up to 26.3%, much higher than that using green laser directly (usually <20%). This setup enables long-range underwater transmission of 65.3 meters with a peak data rate of 3.45 MHz, opening up new avenues for innovative advancements in UWOC technology.
研究领域:
光学通信
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光子学
·
材料科学
·
固态照明
·
水下技术
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激光技术
·
通信工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shiyu Xiao,Shian Xie,Manbo Zhang,Shengmin Hu,Marc Adape,Jian Wang,Xinhui Zhang,Yongqin Wei,Wei Chen
Here we report two luminescent copper complexes with different structures and luminescent properties, the blue-green [CuI(dmpyHS) (PPh 3 ) 2 ]⸱CH 3 CN (CuPy-PPh 3 ) and the red [Cu 6 (dmpyS) 6 ]⸱H 2 O (CuPy). When the blue-green light (CuPy-PPh 3 ) is heated to above 147 °C, it loses the phosphine-containing ligand, PPh 3 , and turns into CuPy and instead emits red light. Many luminescent complexes show the change of luminescence properties when the temperature is lower than room temperature , while the luminescence change of CuPy-PPh 3 occurs during the heating process above room temperature. Even more interesting, the luminescence wavelength transition span is large, from blue-green light emission at 490 nm to red light at 676 nm. The luminescence of the two copper complexes covers the three primary colors of red, green and blue required for the formation of white light emitting diodes WLEDs, which has potential in the development of non-rare earth phosphor white color displays. The integration of CuPy-PPh 3 and CuPy on a 395 nm near-ultraviolet chip can assemble WLEDs with good white light properties, which provides a new way for the construction of rare earth-free phosphor WLEDs. The synthesis of the two luminescent copper complexes is simple and environmentally friendly. Even though the structures of two copper complexes have been reported, the synthesis methods are different from those in the related literature and the luminescence properties of these complexes have never been described previously. The red emission copper complex CuPy is obtained by the thermal conversion of the blue-green emission copper complex CuPy-PPh 3 , which is a new phenomenon discovered for the first time in this work.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 9
·2619-2630
·
IF 4
Xuejiao Wang,Xiaowen Feng,Maxim S. Molokeev,Huiling Zheng,Qiushi Wang,Chunyan Xu,Ji-Guang Li
Phosphors that exhibit tunable broadband emissions are highly desired in multi-functional LEDs, including pc-WLEDs and pc-NIR LEDs. In this work, broadband emissions were obtained and modulated in the unexpectedly wide spectral range of 517–609 nm for (Lu0.99−xGdxBi0.01)2WO6 phosphors by tuning the Gd3+ content (x = 0–0.99). The effects of Gd3+ doping on phase constituents, particle morphology, crystal structure, and photoluminescence were systematically investigated. Broadband green emission was obtained from Gd3+-free (Lu0.99Bi0.01)2WO6 phosphors (x = 0), whose emission intensity was enhanced by 50% with 5 at% Gd3+ (x = 0.05). The phase transition happened when x > 0.50 and the broadband red-NIR emission was obtained when x = 0.75–0.99. Three luminescence centers were proved to be responsible for the broadband green emissions via crystal structure, spectral fitting and fluorescence decay analysis. A pc-WLED with a high color rendering index (Ra = 91.3), a stable emission color, and a low color temperature (3951 K) was fabricated from the (Lu0.94Gd0.05Bi0.01)2WO6 broadband green phosphor, and an LED device that simultaneously emits high color rendering index white light and NIR light was obtained with the (Gd0.99Bi0.01)2WO6 broadband red-NIR phosphor. Night vision and noninvasive imaging were also demonstrated using the latter LED device.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinyu Zhang,Wanyuan Li,Chao Wang,Lin Zhang,Shuxing Li,Rong-Jun Xie
β-Sialon:Eu 2+ (Si 6-z Al z O z N 8-z :Eu 2+ , 0 < z ≤ 4.2) has been recognized as an excellent narrow-band green phosphor for wide-color-gamut backlights, but it is quite difficult to realize high quantum efficiency when further reducing the bandwidth of β-Sialon:Eu 2+ to achieve high color purity. Herein, we propose an ingenious sintering method to minimize the trade-off between color purity and luminescence intensity of β-Sialon:Eu 2+ , and finally obtain ultra-narrow band β-Sialon:Eu 2+ with an emission maximum of 527 nm, a full width at half maximum of 44.9 nm and an external quantum efficiency of 37.3 % when z is reduced to 0.03. Structural analyses indicate that β-Sialon:Eu 2+ shows higher structural ordering and rigidity with decreasing the Al-O substitution ( i.e. , z value). By combining β-Sialon:Eu 2+ (z = 0.03), a red phosphor K 2 SiF 6 :Mn 4+ with a blue InGaN LED chip, white light-emitting diodes with a luminous efficacy of 93.91 lm W −1 and a color gamut as high as 101.2 % National Television System Committee standard were demonstrated, which are superior to those in color gamut (4.3–16.8 % up) by using commercial β-Sialon:Eu 2+ .
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 SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Bin Duan,Changchun Ding,Mengjia Zhang,Yuxiang Wu,Yongqiang Li,Wei Jin,Fengyi Wang,Junshan Hu
Exploring novel oxysalt compounds remains significant due to their affordability and versatile applications, such as serving as laser crystals, piezoelectric crystals, frequency-doubling crystals, and luminescent materials. Specifically, this study introduces a new near-single green upconversion luminescent Ca 9 (VO 4 ) 7 : Yb 3+ /Er 3+ material, synthesized through high-temperature solid-phase methods. When subjected to 980 nm near-infrared laser irradiation, the Ca 9 (VO 4 ) 7 : 0.3 Yb 3+ , 0.02 Er 3+ phosphor demonstrates robust green luminescence at 531 nm ( 2 H 11/2 → 4 I 15/2 ) and 558 nm ( 4 S 3/2 → 4 I 15/2 ), accompanied by faint red luminescence at 665 nm ( 4 F 9/2 → 4 I 15/2 ). The optimal doping concentrations for Yb 3+ and Er 3+ ions, yielding the highest upconversion luminescence intensity, are determined to be 0.3 and 0.02, respectively. The investigation elucidates the upconversion luminescence mechanism through the downward shift spectrum in photoluminescence and the pumping power dependence of upconversion green-red luminescence. The primary excitation pathway identified for the upconversion process in Ca 9 Y(VO 4 ) 7 : 0.3 Yb 3+ , 0.02 Er 3+ involves Yb 3+ ( 2 F 5/2 ) + Er 3+ ( 4 I 11/2 ) → Yb 3+ ( 2 F 7/2 ) + Er 3+ ( 4 F 7/2 ). This research contributes to the exploration of new materials, injecting vitality into modern industries and production processes.
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 PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2022
·
IF 5.141
Hongxiang Li,Chunyue Zhao,Zhen Wang,Jinfeng Xing
The application of drug-loaded nanogels in the treatment of cancer has attracted much attention. Here, the stability of chrysin under green LED was investigated, the nanogels loaded with chrysin in situ were prepared and the effect of chrysin in the polymerization reaction was investigated. The morphology, chemical structure, and drug-polymer interactions of the nanogels loaded with chrysin (NG-C) were studied. Moreover, the time of gel point appearance and double bond conversion were also evaluated.
研究领域:
药学
·
材料科学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
OPTICS LETTERS
·
2024
·Vol. 49
·期 9
·2245-2248
·
IF 3.1
Xiaolan Zhou,Xiaolan Zhou,Shengyuan Chen,Shengyuan Chen,Cong Zhang,Cong Zhang,Xu Huang,Xu Huang,Kailei Lu,Kailei Lu,Jianqi Qi,Jianqi Qi,Jianqi Qi,Tiecheng Lu,Tiecheng Lu,Tiecheng Lu,Tiecheng Lu
Narrowband green-emission, combined with superior physicochemical stability and thermal performance, is regarded as a common pursuit in backlight display applications. However, mainstream phosphor-converted materials composed of resin or silicone resin easily encounter the dilemma of thermal decomposition and chemical corrosion for practical use. To overcome this problem, in this work, Mn2+/Mg2+ co-doped AlON ceramic is successfully realized with ultra-narrowband green-emission and high transparency. The luminescent property of AlON: Mn2+–Mg2+ ceramic exhibits narrowband green emission centered at 509 nm with a full width at half maximum of 36 nm, which is smaller than the corresponding powder counterpart (44 nm). Moreover, AlON: Mn2+–Mg2+ ceramic presents a wide color gamut (103.6%) and high color purity (74%). Concurrently, high transmittance of this ceramic, at 82%, unveils a potential innovation in the display technology field. This work may facilitate the development of narrowband green light-emitting converters based on AlON: Mn2+–Mg2+ transparent ceramics in large color gamut backlight display applications.
研究领域:
材料科学
·
光学工程
·
显示技术
✓ 已验证
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2023
·
IF 7
Chenyang Zhan,Haomiao Zhu,Sisi Liang,Yingping Huang,Zihao Wang,Maochun Hong
Weak blue light absorption severely limits the application of Mn2+-activated narrowband green phosphors. Herein, a strategy to improve the absorption of Mn2+-activated phosphors is proposed by selecting a suitable host to achieve a high doping concentration of Mn2+. Specifically, a magnetoplumbite-type compound La0.827Al11.9O19.09 with a unique layered structure is selected as the host to accommodate Mn2+ (La0.827Al11.9−xMnxO19.09,LAO:xMn2+) and a high doping concentration of x = 0.30 is obtained. Upon 450 nm excitation, the prepared phosphor LAO:0.30Mn2+ displays an intense narrowband green emission peaking at 517 nm with a full width at half-maximum (FWHM) of 28 nm, a color purity of 88% and an internal/external quantum yield of 90%/16%. Furthermore, it exhibits a low thermal quenching (6% at 423 K) and negligible color drifting (3.29‰ at 423 K). The LED device fabricated from the green phosphor LAO:0.30Mn2+, the commercial red phosphor K2TiF6:Mn4+ and a blue InGaN chip can emit bright white light with a corresponding correlated color temperature (CCT) of 5464 K and a color gamut value of 124% of the National Television Commission (NTSC) standard. These results indicate that the LAO:0.30Mn2+ phosphor has great potential for usage as a green component in wide-color gamut LCD backlight applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Xinyi Zhang,Wenqi Xia,Zehua Xue,Wanyu Zhao,Xiyuan Zhang,Zuobin Tang
Broadband yellow-green-emitting materials help to improve the color rendition performance of phosphor-converted white light-emitting diodes (pc-WLEDs). Herein, we report a Bi 3+ -activated double perovskite (La 2 MgHfO 6 ) broadband yellow-green-emitting phosphor synthesized via high-temperature solid-state reaction. Structural characterization confirms phase-pure crystallization in the P21/n space group, while spectral analysis reveals a broad yellow-green emission (λ em = 544 nm, FWHM = 137 nm) under 370 nm excitation, attributed to the parity-allowed 3 P 1 → 1 S 0 transition of Bi 3+ in [LaO 8 ] dodecahedron and [Mg/HfO 6 ] octahedra. The material effectively suppresses concentration quenching owing to the relatively large interionic distances within its crystal structure. Meanwhile, its emission peak exhibits a red-shifting (Δλ = 30 nm) with varying excitation wavelengths, which stems from the distinct responses of different luminescent centers to excitation energy. Additionally, it demonstrates good thermal stability, with minimal temperature-induced changes in peak position and full width at half maximum (FWHM). When combined with commercial red (CaAlSiN 3 :Eu 2+ ) and blue (BAM:Eu 2+ ) phosphors, the fabricated WLED exhibits bright white light with superior color rendering (Ra = 86.9) and comfortable correlated color temperature (CCT = 4994 K). The yellow-green emission significantly enhances spectral continuity, demonstrating great potential as a rare-earth-free component for high-quality full-spectrum lighting systems.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2021
·
IF 3.314
Guojun Zhou,Qiqiong Ren,Maxim S. Molokeev,Yayun Zhou,Jian Zhang,Xian-Ming Zhang
The discovery of narrow-band luminescent materials remains an immense challenge to optimize the performance of white light-emitting diodes (LEDs). So far, the zero-dimensional (0D) Mn2+-based halides with near-unity narrow-band emissions have emerged as a class of promising phosphors in solid-state displays, but the related large-scale synthesis strategies have not been proposed and evaluated. Herein, we report an in situ synthetic process of 0D Mn2+-based halides and utilize (C20H20P)2MnBr4 as a case to investigate the photoluminescence characteristics and the structural essence of ultrafast self-assembly. The bright green emission peak at 523 nm with a full width at half maximum of 48 nm for (C20H20P)2MnBr4 is attributed to the d–d transition (4T1–6A1) of tetrahedrally coordinated [MnBr4]2– centers, and the fabricated white LED device shows a wide color gamut of 103.7% National Television System Committee (NTSC) standard. Remarkably, the experimental and theoretical results indicate that there are hydrogen bonding of C–H···Br and weak van der Waals interactions between [C20H20P]+ and [MnBr4]2–, resulting in the root for the realization of ultrafast self-assembly in 0D Mn2+-based halides. This work reveals a feasible and general synthesis method for preparing 0D Mn2+-based halides, thereby providing a possibility for their industrial application in solid-state displays.
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）