Journal of Physical Chemistry C
·
2023
·
IF 3.7
Liang Jing,Qingmei Cen,Qi Pang,Jin Zhong Zhang
In this work, lead-free zero-dimensional (0D) all-inorganic perovskite Mn2+-doped Cs2InCl5·H2O microcrystals (MCs) with introduced Bi3+ ion were synthesized by supersaturation recrystallization at room temperature. The electronic bandgap of the MCs is tuned from ∼5.1 to ∼3.1 eV, and the electronic absorption is enhanced in the 200–400 nm region by Bi3+ incorporation. Upon excitation at 365 nm, the MCs with introduced Bi3+ exhibit strong red emission peaking at 640 nm, which is attributed to the Mn2+ transition (4T1g → 6A1g). Simultaneous Mn2+ and Bi3+ incorporation into Cs2InCl5·H2O shows 60 times enhancement of the 640 nm emission band compared to Mn2+ alone. This PL enhancement is attributed to the energy transfer (ET) from the [BiCl6]3– octahedron, which acts as a UV light absorber and exciton donor, to [MnCl6]4–. In addition, a yellow-light-emitting diode (LED) device based on the Cs2In0.45Bi0.55Cl5·H2O:17%Mn MCs was fabricated and evaluated, showing high color saturation at a drive current of 420 mA and good stability. This study demonstrates a new method for achieving efficient red emission by incorporating ns2 metal ions and Mn ions in 0D lead-free metal halides.
研究领域:
材料科学
·
光电
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Pengpeng Lei,Peng Zhang,Shuang Yao,Shuyan Song,Lile Dong,Xia Xu,Xiuling Liu,Kaimin Du,Jing Feng,Hongjie Zhang
Bioimaging probes have been extensive studied for many years, while it is still a challenge to further improve the image quality for precise diagnosis in clinical medicine. Here, monodisperse NaGdF4:Yb3+,Tm3+,x% Bi3+ (abbreviated as GYT-x% Bi3+, x = 0, 5, 10, 15, 20, 25, 30) upconversion nanoparticles (UCNPs) have been prepared through the solvothermal method. The near-infrared upconversion emission intensity of GYT-25% Bi3+ has been enhanced remarkably than that of NaGdF4:Yb3+,Tm3+ (GYT) with a factor of ∼60. Especially, the near-infrared upconversion emission band centered at 802 nm is 150 times stronger than the blue emission band of GYT-25% Bi3+ UCNPs. Such high ratio of NIR/blue UCL intensity could reduce the damage to tissues in the bioimaging process. The possibility of using GYT-25% Bi3+ UCNPs with strong near-infrared upconversion emission for optical imaging in vitro and in vivo was performed. Encouragingly, the UCL imaging penetration depth can be achieved as deep as 20 mm. Importantly, GYT-25% Bi3+ UCNPs exhibit a much higher X-ray computed tomography (CT) contrast efficiency than GYT and iodine-based contrast agent under the same clinical conditions, due to the high X-ray attenuation coefficient of bismuth. Hence, simultaneous remarkable enhancement of NIR emission and X-ray CT signal in upconversion nanoparticles could be achieved by optimizing the doping concentration of Bi3+ ions. Additionally, Gd3+ ions in the UCNPs endow GYT-25% Bi3+ UCNPs with T1-weighted magnetic resonance (MR) imaging capability.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
医学成像
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Peipei Dang,Qianqian Zhang,Dongjie Liu,Guogang Li,Hongzhou Lian,Mengmeng Shang,Jun Lin
The equivalent or hetero-valent substitution strategy is an efficient method for stimulating photoluminescence tuning or optimizing the photoluminescence performances of phosphor materials. A new K 2 NiF 4 -type layered perovskite SrLaZnO 3.5 :Bi 3+ phosphor with broad-band yellow emission (558 nm) is first explored. Based on an efficient hetero-valent substitution strategy, a series of Sr 1- x La 1+ x ZnO 3.5+ x /2 :Bi 3+ (0 ≤ x ≤ 0.4) solid solution phases are successfully constructed. The different Bi 3+ local environments at two crystallographic sites and vacancy oxygen make the various distributions of emission and excitation spectra. Consecutive emission tuning from yellow (558 nm) to orange (585 nm), and improvement of emission intensity and internal quantum efficiency (IQE = 45%-64%) are achieved through La 3+ hetero-valent substitution for Sr 2+ in Sr 1- x La 1+ x ZnO 3.5+ x /2 :Bi 3+ (0 ≤ x ≤ 0.4). The structural stability and Bi 3+ occupation distribution in solid solution have been revealed by structural elaboration and crystal field regulation. Based on the both hetero-valent substitution and site-selective excitation strategies, a novel orange-red luminescence can be observed peaking at ~609 nm under near-ultraviolet light (~390 nm) excitation without visible absorption. The fabricated full-spectrum phosphor-converted white light-emitting diodes (pc-WLEDs) show outstanding warm white light, and a high color rendering index (Ra = 97.1, R9 = 98) is achieved, implying that the as-prepared Sr 1- x La 1+ x ZnO 3.5+ x /2 :Bi 3+ (0 ≤ x ≤ 0.4) phosphors can used as yellow/orange-red components in pc-WLED lighting. These results indicate that hetero-valent substitution can predict and control site preference of luminescent centers, providing a new way for optimizing phosphor materials for solid-state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Ruixin Song,Sai Xu,You Li,Qun Zhang,Yuefeng Gao,Hongquan Yu,Yongze Cao,Xiangping Li,Shanpeng Zhang,Baojiu Chen
The content of Cu 2+ in lubricating oil and lubricant temperature are important indicators predicting mechanical failure. Therefore, developing a nontoxic fluorescence probe is necessary to detect Cu 2+ and temperature in lubricating oil. The lead-free inorganic double perovskite nanocrystals (NCs) Cs 2 AgInCl 6 are potential candidates. However, the low fluorescence intensity and the high excitation energy required of Cs 2 AgInCl 6 NCs limit their practical applications. In this study, Bi 3+ and Tb 3+ were successfully co-doped into Cs 2 AgInCl 6 NCs via the hot-injection method. The doping of Bi 3+ produces a broad emission originating from self-trapped excitons and reduces the excitation energy, allowing commercial LEDs as excitation sources. Tb 3+ ions doping offers characteristic emission peaks ( 5 D 0 - 7 F J ) of Tb 3+ ions and improves the fluorescence intensity of Cs 2 AgInCl 6 NCs. Furthermore, the Cs 2 AgInCl 6 : Bi 3+ /Tb 3+ NCs have been employed as optical thermometry, which provide a temperature calibration curve with the maximum absolute and relative sensitivities of 2.15% K −1 at 350 K and 2.25% K −1 at 303 K in the temperature range of 303–423 K, respectively. Finally, the nanocrystals have been applied to detect Cu 2+ in lubricating oil. The fluorescent probe shows a good detection sensitivity of 8.94 × 10 -4 nM −1 and a low detection limit of 14.3 nM in the range of 10–300 nM. This work not merely offers a novel way for improving the luminescence performances of double perovskite NCs Cs 2 AgInCl 6 , but broadens their potential for detection of Cu 2+ and temperature.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
光学传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shuzeng Zhang,Yang Ding,Zhixue Li,Kangrui Qiang,Chunhua Wang,Ning Han,Meijiao Liu,Jiasong Zhong
Long afterglow phosphors for optical information storage and anti-counterfeiting applications have attracted increasing attention due to their inherent atom defects triggered persistent emission properties. However, precisely modulating the defect concentration and trapping energy level distribution in phosphors is still a huge challenge, let alone understanding the relationship between the defect concentration/position and afterglow behavior. Herein, we reported the Bi 3+ induced oxygen vacancy engineering in MgGa 2 O 4 (MGO) phosphor for controlled afterglow and dynamic multimode emissions. A variety of spectrum characterizations and theoretical calculations confirmed that doping with a higher concentration of Bi 3+ leads to more oxygen defects in MGO host. Specifically, increasing oxygen defects can result in a gradually enhanced ratio of shallow trap and decreased ratio of deep trap in the band gap of MGO phosphor, being responsible for the modulated afterglow behaviors. Moreover, the abundant trapping state also induced dynamic luminescence performance upon persistent UV light irradiation. By virtue of the fantastic afterglow and dynamic luminescence emission properties, optical storage and information encryption applications of the prepared MGO:Bi 3+ phosphors were developed. The vacancy engineering for tunable multimode emission proposed in this work can spur several new ideas and concepts in designing advanced phosphors for multifunctional optoelectronic applications.
研究领域:
材料科学
·
光电子学
·
固体化学
·
功能材料
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yanling Chen,Jianhua Lin,Jie Fu,Renguang Ye,Lei Lei,Yang Shen,Degang Deng,Shiqing Xu
Here, La 2 MgGeO 6 : Bi 3+ , Er 3+ samples were synthesized by the high-temperature solid-phase method, and the up/down-conversion luminescence properties were investigated with the excitation of near-infrared light (980 nm and 1550 nm) and ultraviolet light (322–378 nm). Under the excitation of ultraviolet light, the sample can exhibit the characteristic broadband blue emission (Bi 3+ ions) and green emission (Er 3+ ions). When excited with near-infrared light, the sample has only typical green and orange up-conversion emission bands. The green and orange luminescence could be achieved by adjusting the excitation wavelength. In addition, the sample can present multicolor luminescence with the change of pump power and temperature. At the same time, the temperature measurement performance of the phosphor was explored by using the fluorescence intensity ratio technique based on the Er 3+ ion thermal coupling energy level ( 2 H 11/2 / 4 S 3/2 ) and non-thermal coupling energy level ( 2 H 11/2 / 4 F 9/2 ). The maximum temperature sensitivity reached 1.23 %K −1 and 0.99 %K −1 , respectively. Therefore, La 2 MgGeO 6 : Bi 3+ , Er 3+ samples could be candidates for multicolor anti-counterfeiting and temperature sensors material.
研究领域:
材料科学
·
光学
·
纳米技术
·
传感器
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Bin Li,Yingfang Li,Bin Cao,Chong Yang,Rongbo Ma,Chaoyong Deng,Weichao Huang
The high-temperature solid-state method synthesized novel double perovskite CaSrLaSbO 6 : Bi 3+ , Mn 4+ phosphors. Its crystal structure, luminescence properties, crystal field strength, energy transfer process, and temperature-sensitive properties were comprehensively investigated. The band gap values of CaSrLaSbO 6 were calculated using density functional theory. In the CaSrLaSbO 6 host, Bi 3+ exhibits multiple emission properties in the violet, blue, and NIR regions due to the 3 P 1 → 1 S 0 transition, while the red emission is due to the 2 E g → 4 A 2g transition of Mn 4+ . Light-converting films fabricated using CaSrLaSbO 6 :Bi 3+ , Mn 4+ under 302 nm UV excitation with multiple emissions showed significant plant growth promotion. In addition, the optical temperature-dependent response of CaSrLaSbO 6 : Bi 3+ , Mn 4+ was analyzed using the luminescence intensity ratio technique, and the relative sensitivity of the best samples reached 2.1 % K −1 . The above results indicate that CaSrLaSbO 6 : Bi 3+ , Mn 4+ provides almost all the light sources necessary for plant growth and can be applied in the field of optical temperature sensors, which shows that this multifunctional phosphor has great potential for application.
研究领域:
材料科学
·
植物学
·
光学工程
✓ 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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ke Chen,Peixin Gao,Zengtao Zhang,Yibiao Ma,Zan Luo,Maxim S. Molokeev,Zhi Zhou,Mao Xia
Bi 3+ -activated phosphors have been proven to have potential applications foreground in white light-emitting diodes (WLED), plant growth lamps and temperature sensing. Therefore, it is urgent to exploit high-efficiency Bi 3+ -activated phosphors. Herein, a novel broadband yellow-emitting phosphor Ba 2 GdGaO 5 :Bi 3+ with high internal quantum efficiency (IQE = 77%) was obtained based on metal to metal charge transfer (MMCT) between Bi 3+ ground state and Gd 3+ excited states. The photoluminescence excitation (PLE) spectrum and photoluminescence (PL) spectrum range from 225 nm to 400 nm and 400 nm to 700 nm, respectively, which can avoid the reabsorption phenomenon efficiently. Besides, Ba 2 GdGaO 5 :Bi 3+ has superior thermal stability and it shows zero-thermal-quenching at 150 °C. The K + doping hardly changes the thermal stability and can improve the PL intensity to 133.1% when the K + concentration is 2%. Finally, a phosphor-convert WLED (pc-WLED) was simply synthesized by Ba 2 GdGaO 5 :Bi 3+ and BaMgAl 10 O 17 :Eu 2+ (BAM:Eu 2+ ) phosphors. The doping of Eu 3+ can significantly enhance the color rendering index (CRI, from 88.1 to 91.5) and reduce the correlated color temperature (CCT, from 4911 K to 4014 K). The above experimental results demonstrated that the phosphor has great application prospect in WLED.
研究领域:
材料科学
·
发光材料
·
固态化学
·
光电子学
·
无机功能材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 43
·15231-15237
·
IF 4.174
Guodong Zhang,Yi Wei,Peipei Dang,Hui Xiao,Dongjie Liu,Xinke Li,Ziyong Cheng,Jun Lin
Double perovskites have attracted wide attention due to their low toxicity and good thermal stability. Doping with active elements is a promising method to endow perovskites with excellent optical, electrical or magnetic properties. Herein, a facile aqueous solution method is developed to synthesize Bi3+–Yb3+ co-doped Cs2Na0.6Ag0.4InCl6 double perovskite. Besides the intrinsic warm white self-trapped exciton (STE) emission that originated from the Cs2Na0.6Ag0.4InCl6 host, the samples also exhibit a strong near-infrared emission assigned to the 2F5/2 → 2F7/2 transition of octahedral coordinated Yb3+ ions upon excitation with ultraviolet light. The optimized sample shows a markedly high photoluminescence quantum yield of 84.7%. The photophysical studies such as photoluminescence (PL) and photoluminescence excitation spectra, temperature-dependent PL spectra, and PL decay curves reveal that the strong Yb3+ emission is attributed to the energy transfer from STEs to the Yb3+ ions. Finally, the lead-free double perovskite phosphor-converted LED containing visible and NIR regions was fabricated, with 8.92 mW output power at 100 mA drive current. The results show the great potential of the as-prepared crystals in optoelectronics applications.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yawei Jiang,Yan Mi,Chufan Li,Wenjian Fang,Xiaochuan Li,Xianghua Zeng,Yongsheng Liu,Wenfeng Shangguan
The solid solution constructed by two or more semiconductors with different bandgaps can effectively modulate the energy band, satisfying the redox potential for both H + /H 2 and O 2 /H 2 O. In this paper, Sillen-Aurivillius compounds with layered structure Bi 3 O 4 Cl and Y 3 O 4 Cl solid solution (Bi 3−x Y x O 4 Cl) were successfully synthesized by the solid-phase method. The absorption edge of Bi 3−x Y x O 4 Cl could be dramatically changed from about 500–740 nm with the increase of Bi elements, which accounted for the entire UV-Vis region of the solar spectrum. Furthermore, the bandgaps for Bi 3−x Y x O 4 Cl could be adjusted from about 2.6–2.0 eV with the decreased Y/Bi ratio from 2 to 0.2. Significantly, the conduction band minimum energy (CBM) of Bi 3−x Y x O 4 Cl all satisfied the redox potential for H + /H 2 , which showed excellent visible-light photocatalytic water splitting.
研究领域:
材料科学
·
化学
·
光催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiangyan Yun,Jingheng Nie,Hanlin Hu,Haizhe Zhong,Denghui Xu,Yumeng Shi,Henan Li
Zero-dimension (0D) lead-free metal halide perovskites have attracted great attention because of their outstanding photophysical properties. However, the development of tunable-color-temperature white-light emission in single perovskite phosphors is still a challenge. Herein, a dual-band tunable multicolor emitters based on ns2 ions (Bi3+ and Te4+) codoped with a 0D hybrid perovskite derivative (C4H12N)2HfCl6 is reported. The prepared (C4H12N)2HfCl6:Bi3+/Te4+ samples exhibit broad dual-band emission originating from the dopant self-trapped excitons of [BiCl6]3– and [TeCl6]2–, respectively. By virtue of the energy transfer from blue-emitting (Bi3+) to yellow-emitting (Te4+), tunable dual-emission white-light emission covering the entire visible region is achieved. Meanwhile, Bi3+/Te4+-codoped perovskites exhibit unique excitation-dependent emission, and a wide color gamut can be obtained by precisely controlling the excitation wavelength, which corresponds to the color hue evolution from warm white to blue, then to white, and finally to orange. These findings provide fundamental insight into multicolor emission in the Bi3+/Te4+-codoped systems and open up more opportunities for multifunctional applications.
研究领域:
材料科学
·
光电
·
光子学
·
固体化学
✓ 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）