PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2013
·Vol. 90
·期 3
·496-502
·
IF 2.287
Kun Li,Qin Zhang,Mei Wang,Rongrong Zhu,Xiaoyu Sun,Xianzheng Wu,Shi-Long Wang
Tanshinone IIA (Tan IIA) has the properties of cardiovascular protection, anti-inflammation, antioxidation and anticancer. Its light-induced instability has drawn our interests in its photochemistry. Therefore, laser flash photolysis herein was used to investigate the transient photochemistry of Tan IIA. Our results show that direct photoexcitation by 355 nm laser pulses or photosensitization by energy transfer can lead to the formation of the triplet state of Tan IIA ( 3 Tan IIA*). The triplet absorption spectrum and molar absorption coefficient, and ISC quantum yield were determined. Self-quenching of 3 Tan IIA* by its ground state was identified as an autooxidation reaction. 3 Tan IIA* was proved to react quickly with N , N -dimethylaniline, tert-butylhydroquinone and propyl gallate via electron transfer with the diffusion-controlled rate constants. One of the products with maximum absorption around 390 nm was assigned to the radical anion of Tan IIA. Our results indicate that 3 Tan IIA* is a reactive transient species and can be generated by photosensitization or direct photoexcitation. According to our results, the possible role of Tan IIA as a photosensitizer to induce potential phototoxicity via Type-II pathway in the presence of O 2 can be predicted.
研究领域:
药理学
·
光化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Ting Chen,Youpeng Li,Chunxian Guo,Changqing Ye,Yuanhong Chen,Zhixiang Xie
Preparation of AgInS 2 quantum dots (AIS QDs) with high photoluminescence quantum yield (PLQY) and thermal stability remains an important challenge. In this paper, AIS QDs were successfully introduced into zeolitic imidazolate framework-8 (ZIF-8) by microwave-assisted hydrothermal method. Due to the effective isolation of the ZIF-8, the AIS QDs avoid the concentration quenching when they were assembled into white light emitting diodes (WLEDs) devices as color conversion materials. More importantly, the generation of ZnS layer between the interfaces of AIS QDs and ZIF-8 can efficiently improve the optical performance of AIS QDs, resulting in the fluorescence lifetime extended to 470.05 ns. Meanwhile, the PLQY of AIS/ZIF-8 composite reached up 34.30 % when microwave hydrothermal heating at 120 °C for 60 min with AgIn/Zn=1/3, which was higher than that of the pristine AIS QDs as 25.30 %. Finally, the WLED devices were fabricated by combining AIS/ZIF-8 composite fluorescent powder with (Ba, Sr)Si 2 O 2 N 2 :Eu 2+ phosphors and blue LED. At 20 mA, the AIS/ZIF-8 based WLED shows the luminous efficiency (LE) of 44.54 lm/W, correlated color temperature (CCT) of 4242 K and color rendering index (CRI) of 89.1. Moreover, the Commission International de L'Eclairage (CIE) was (0.36, 0.35), indicating the WLED emited warm white light. The present strategy aims at enhancing the optical performance of AIS QDs, which also may trigger the development of QDs-based WLED.
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
·
2025
·
IF 5.1
Shan shan Zhao,He-He Dong,Weichang Li,Lei Zhang,Shikai Wang,Chun Yu,Hu Li
Upconversion emission materials have many advantages, such as narrowband sharp line emission, excellent photochemical stability, and long lifespan. In particular, under 980 nm invisible laser-beam irradiation, materials with visible light upconversion luminescence have vital application value in optical anti-counterfeiting and laser displays. In this study, a library of upconversion phosphors of CaLaAl3O7:RE3+/Yb3+ (RE=Tm, Ho) was produced through a high-temperature solid-state reaction method. The powders exhibited different color emissions under different excited wavelengths. Under 980 nm laser excitation, Tm3+/Yb3+ co-doped phosphors exhibited upconversion emission of 474 nm blue light, which was attributed to the 1G4→3H6 transition of Tm3+, and the fitting slope of the upconversion luminescence intensity vs. laser-pump power density was n450-500=2.83, which indicated the three-photon absorption upconversion process. Additionally, Ho3+/Yb3+ co-doped phosphors had the strongest red emission at 660 nm, originating from the 5F4/5S2→5I8 transition of Ho3+, which belongs to the two-photon absorption process. Subsequently, the changes in chromaticity coordinates of the prepared samples were analyzed under different light excitations, and different light color emissions were observed. The color purities of Ho3+/Yb3+ and Tm3+/Yb3+ co-doped samples were 99.9% and 65.4%, respectively. Finally, we verified the practical application value of the prepared powder in the fields of multi-color luminescence optical anti-counterfeiting and laser displays. The results show that the produced phosphors have vital application potential in information security protection, optical data storage, and 3D laser displays.
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
ACS Applied Energy Materials
·
2022
·
IF 6.959
Yuhan Wu,Yuan Zhan,Wei Xin,Wenbing Cao,Jinhua Li,Ming Chen,Xuanfeng Jiang,Jianying Wang,Zhengguang Sun
Carbon dots (CDs) have attracted increasing attention in the field of luminescent solar concentrators (LSCs) due to their environmental and economic friendliness, simple synthesis method, and excellent optical properties. However, their limited solid-state photoluminescence hinders their applications in LSCs. Herein, novel CDs/organosilicon composites (OSi–CDs) with excellent solid-state emission and photostability were synthesized for LSC application. Two types of single-layer LSCs are fabricated by coating or injecting a mixture of OSi–CDs and a commercial silicone resin on a glass substrate (25 × 25 × 0.7 mm) or into a mold (25 × 25 × 1 mm), respectively, by thermal curing. The external optical efficiencies (ηopt) of the two LSCs can reach 4.50 and 5.89%, respectively, benefitting from the high photoluminescence quantum yield (∼49%) and efficient scattering of the composites. Moreover, the ηopt of the LSCs can remain above 80% after being treated at a temperature of 100 °C or under UV light radiation (λ = 365 nm and 1 W/cm2) for 168 h. This work not only provides highly emissive OSi–CDs for LSC application but also offers a valuable strategy to improve the stability of LSCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 11
·期 4
·1530-1540
·
IF 8.067
Shisheng Lin,Hang Lin,Pengfei Wang,Ping Sui,Hongyi Yang,Ju Xu,Yao Cheng,Yuansheng Wang
Phosphor-converted white laser diode (pc-wLD) technology requires high-color-quality white light, which involves the development of an efficient red-emitting phosphor color converter. With regard to this, we have developed a new kind of orange-yellow-emitting Lu2−xMg2Al2−yGaySi2O12:xCe3+ (LMAGS:Ce3+) solid-solution phosphor, which shows the desired abundant red-emissive components and nanosecond-range luminescent decay. LMAGS:Ce3+ is further compounded into an all-inorganic phosphor-in-glass (PiG) composite tightly bonded to a high-thermal-conductivity sapphire plate (SP) in the form of a film. There is no obvious interfacial reaction between phosphor and glass during co-sintering, which ensures good luminescent properties are retained. A comparative study was conducted to reveal the microstructure–property relationship and the key influencing factors of luminescence saturation upon being driven by a blue laser. “One-dimensional photonic crystal film” and “phosphor wheel” designs were adopted to further enhance the luminescent performance, successfully improving the luminous flux of the generated white light to 393.8 lm @ 5 W mm−2 under static–transmissive excitation mode and 1080 lm @ 20 W mm−2 under rotatory–reflective excitation mode. Probing into the luminescence saturation mechanism, the effects of thermal saturation and optical saturation were demonstrated, accounting for 44.0% and 56.0% contributions, respectively. A fabricated prototype neutral/warm-white LD lighting source based on LMAGS:Ce3+ PiG film-on-SP shows high light collimation and comfortable visual perception, demonstrating the bright application potentials of the developed composite material.
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
·
2023
·
IF 3.6
Yi Qin,Lingxiang Chu,Tao Yang,Jing Wan,Qiang Zhou,Yanqing Ye,Huaijun Tang,Zhengliang Wang
In this study, an efficient polyfluoride red-emitting phosphor, Cs 3 RbGe 2 F 12 :Mn 4+ (denoted as CRGF:Mn), has been synthesized using a simple co-precipitation method. The crystal and electronic structures, spectroscopic properties, and photoluminescence thermal stability of CRGF:Mn have been systematically characterized. The results show that Mn 4+ ions experience a strong crystal field and present a series of intense red emission peaks under blue light excitation. Moreover, CRGF:Mn exhibits a high color purity (95.1 %), high internal quantum efficiency (82.4 %), and enhanced photoluminescence thermal stability at 150 °C, with an intensity of 113 % relative to room temperature . A warm white light-emitting diode exhibiting a low correlated color temperature (3572 K), high color rendering index (90.7), and suitable luminous efficiency (132.6 lm/W) was prepared using CRGF:Mn as a red component, demonstrating viable application in solid-state lighting.
研究领域:
材料科学
·
光学
·
固态照明
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Wenwen Gao,Wenxia Liu,Yanhua Leng,Xiaowei Wang,Xingqi Wang,Bin Hu,Dehai Yu,Yuanhua Sang,Hong Liu
We, herein, report the synthesis of the first photocatalyst, tetragonal In 2 S 3 nanoparticles, to display broad-spectrum photocatalytic properties under ultraviolet (UV), visible, and near-infrared irradiation from a simple hydrothermal method. The as-synthesized In 2 S 3 nanoparticles have irregular morphology and possess a primary particle size of 5–20 nm with high photo-degradation abilities under UV (96.2% within 30 min), visible light (95.4% within 3 h) and near-infrared light (67.2% within 3 h), a phenomenon extremely rare in character with respect to a broad class of photocatalysts that have a single crystalline phase. This current work in broadband spectrum photocatalysis affords a new paradigm for the full utilization of solar light.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Peng Du,Jun Tang,Weiping Li,Laihui Luo
To overcome the existence challenge of the luminescent materials in versatile applications, NaLuF 4 : x Eu 3+ nanopariticles and NaLuF 4 :0.15Eu 3+ @ y g-C 3 N 4 composites were designed. Under irradiation of 394 nm, dazzling red emissions with high color purity of 87.6% are observed in the NaLuF 4 : x Eu 3+ nanoparticles and the optimizing content of the dopants is 15 mol%. The electric dipole-dipole interaction leads to the concentration dependent quenching effect. Through assessing the resistance performance of the resultant nanoparticles to the temperature, the studied samples are certified to show high thermal stability. Furthermore, the proper color rendering index (80.2), low correlated color temperature (5014 K) and suitable luminous efficiency (12.1 lm/W) of packaged white light-emitting diode reveal that the NaLuF 4 :0.15Eu 3+ nanoparticles can be employed as the red component for white light-emitting diode. On account of the inconsistent photoluminescence performances of the NaLuF 4 :0.15Eu 3+ nanoparticles and g-C 3 N 4 , the thermometric properties of the NaLuF 4 :0.15Eu 3+ @ y g-C 3 N 4 composites are explored. The maximum absolute and relative sensitivities of the designed composites are 0.0057 K −1 and 0.455% K −1 , respectively, and their values are able to be manipulated via composition regulation. This work proposes a new sight into the exploitation of diverse photoluminescence behaviors of the g-C 3 N 4 and NaLuF 4 : x Eu 3+ nanoparticles to realize versatile applications.
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 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
Advanced Optical Materials
·
2021
·Vol. 9
·期 19
·2100337
·
IF 9.926
Dan Zhang,Xiangting Zhang,Baofeng Zheng,Qi Sun,Zhibo Zheng,Zhan Shi,Yanhua Song,Haifeng Zou
A series of Eu 2+ single doped Ca 9 Na 1– x Li x Sc 0.667 (PO 4 ) 7 phosphors with full-spectrum emission have been synthesized. Under the 385 nm excitation, the Eu 2+ single doped Ca 9 NaSc 0.667 (PO 4 ) 7 without Li + doping displays a broad cold white light emission with the peaks at about 480 and 610 nm. With the introduction of Li + ions, the Eu 2+ ions selectively occupy the Ca1, Ca2/Ca3, and Na sites. The variation of local environment of Eu 2+ ions caused by Li + ions enhances the luminous intensity, solves the problem of the lack of a red light component, and realizes the emission color tuning from cold white via warm white to orange. A special charge compensation method caused by Li + migration avoids the generation of defects and is beneficial to the improvement of luminescence properties. Eventually, a warm white light-emitting diode device is prepared by combining the white emitting Ca 9 Na 0.8 Li 0.2 Sc 0.667 (PO 4 ) 7 :2%Eu 2+ phosphors with 385 nm LED chip, which exhibits a high color-rendering of 92.9, low correlated color temperatures of 4529 K, and excellent color stability under working temperature. The as-reported warm white emitting Eu 2+ -doped phosphors have potential applications in full-spectrum solid-state lighting. The site engineering strategy provides an extensive guide for optimizing and designing novel single-composition white-emitting phosphor materials.
研究领域:
材料科学
·
光学工程
·
固态照明
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 7
·6832-6837
·
IF 2.195
Li Chunzhe
A series of Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ and Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ /Mn 2+ phosphors were fabricated by a solid state reaction. The phase composition and luminescent properties of the fabricated phosphors were investigated. The XRD patterns show that Eu 2+ and Mn 2+ were doped into the Ca 3 La 6 (SiO 4 ) 6 host in the present experiment. The Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ phosphors show the emission band in blue region and the Ca 3 La 6 (SiO 4 ) 6 :Mn 2+ phosphors exhibit the emission band in yellow region. The excitation band of Ca 3 La 6 (SiO 4 ) 6 :Mn 2+ overlaps with the emission band of Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ that means a possibility for the energy transfer process from Eu 2+ to Mn 2+ in the Ca 3 La 6 (SiO 4 ) 6 :Eu 2+ /Mn 2+ phosphors. Tunable luminescence was obtained due to this energy transfer process and warm white light was emitted by Ca 3 La 6 (SiO 4 ) 6 :0.05Eu 2+ /0.04Mn 2+ and Ca 3 La 6 (SiO 4 ) 6 :0.05Eu 2+ /0.05Mn 2+ phosphors.
研究领域:
材料科学
·
无机化学
·
固体物理
·
发光材料
·
光学材料
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xiaoyi Liu,Haiping Xu,Yunxiao Zhang,Zhendong Fu,Feng Hong,Ge Pang,Guixia Liu,Dan Li,Xiangting Dong,Jinxian Wang
Chrysanthemum-like K 2 LiAlF 6 :Mn 4+ phosphors were synthesized by simple co-precipitation method without using HF. The K 2 LiAlF 6 :Mn 4+ phosphor can be effectively excited through blue light at 465 nm, then produces sharp red-light emission near 634 nm. The luminescence quenching of Mn 4+ is caused by the d-d interaction between Mn 4+ ions. The effects of surfactant and lithium source on the luminescent properties of K 2 LiAlF 6 :Mn 4+ phosphors were discussed. Mn 4+ is located in a strong crystal field environment in the K 2 LiAlF 6 matrix and its emission mechanism is discussed. Warm white light emitting diode (WLED) device, which is fabricated by coating a certain proportion mixture of yellow YAG:Ce 3+ phosphor and red K 2 LiAlF 6 :5%Mn 4+ phosphor on the blue GaN chip, has low correlation color temperature (CCT = 3588 K), high color rendering index (R a = 90.8) and good electroluminescence stability under different currents. These properties illustrate that K 2 LiAlF 6 :5%Mn 4+ phosphor is a promising red light emitting material.
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）