JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yanting Liu,Yanzhu Wang,Lili Meng,Qi Pang,Hua Yao,Qian Chen,Sidi Ye,Yanting Li,Minyi Zheng
Herein, we successfully obtained Ho 3+ and Ag + -codoped Cs 2 NaBiCl 6 halide double perovskites (DPs) via a hydrothermal method , which exhibit orange-red broadband self-trapped excitons (STE) emission and visible (Vis) and near-infrared (NIR) narrow band emission attributed to Ho 3+ f-f transition, under 360 nm excitation. Compared to the single Ho 3+ -doped sample, the Vis PL intensity of the codoped sample was increased by nearly 13.8 times, and an enhanced photoluminescence quantum yield (PLQY) of 87.45 % was achieved. The PL enhancement is attributed to the partial substituting of Na + with Ag + , leading to an efficient STE emission, and the more energy transition from STE to Ho 3+ . Moreover, the synthesized phosphor exhibits good stability in thermal and atmospheric environments. White light-emitting diode (WLED) is fabricated by employing Cs 2 Na 0·997 Ag 0·003 Bi 0.935 Ho 0.065 Cl 6 on near-ultraviolet (n-UV) LED chips, achieving a color rendering index (CRI) of 95.0 and correlated color temperature (CCT) of 3814 K. Anti-counterfeit patterns and the application for night vision monitoring were also discussed. This study inspires the designing of high-quality phosphors of rare earth-doped DPs and expands the multi-domain luminescence applications of halide DPs.
研究领域:
材料科学
·
光学工程
·
稀土材料
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Lihong Qi,Song Wang,Hongyan Li,Wangsheng Jiang,Yusheng He,Ying Wang,Yue Wang,Ying Xie,Kai Pan
This study presents the synthesis and characterization of Cs2NaBiCl6 nanocrystals (NCs) doped with varying concentrations of In3+ to improve their luminescent properties. Utilizing a colloidal solution method, we systematically varied the In3+ concentration to identify the optimal alloying level for enhancing the photoluminescence (PL) properties of the Cs2NaBiCl6 NCs. Structural analysis confirmed that the In-alloyed NCs maintained high crystallinity and a uniform cubic shape. The optical properties were significantly improved with the In3+ alloying, reaching a peak photoluminescence quantum yield (PLQY) at an In/(Bi + In) ratio of 0.7. This optimal alloying concentration led to a nearly 2-fold increase in the average exciton lifetime to 6.98 ns, indicating an enhanced self-trapped exciton generation and improved radiative recombination efficiency. Temperature-dependent PL spectra revealed that the Cs2NaBi0.30In0.70Cl6 NCs exhibited a higher exciton binding energy and longitudinal optical phonon energy compared to the undoped NCs, suggesting superior thermal stability and reduced nonradiative recombination pathways. Density functional theory (DFT) calculations were employed to elucidate the charge density distribution, highlighting significant charge localization at the In–Cl and Bi–Cl bonds, which is attributed to the enhanced charge mobility in the alloyed NCs. The findings of this research not only address the limitations of current lead-free perovskites but also establish In-alloyed Cs2NaBiCl6 NCs as a promising candidate for blue light-emitting devices. This work advances the development of environmentally friendly optoelectronic technologies.
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
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 48
·19578-19585
·
IF 5.7
Junxiang Pei,Haofeng Li,Xiaodong Yuan,An Su,Dechao Yu,Dawei Zhang
Lead-free double perovskite is emerging as an intriguing optical material particularly due to its non-toxicity, higher instability, and tunable multicolor luminescence. Herein, Cs2NaBiCl6 (CNBC) double perovskite was employed as a versatile host to accommodate ionic dopants for multicolor emission properties. By Br− ion doping, the excitation peak can be modulated continuously from 357 to 374 nm, such as the CNBC:30%Br− sample, which just covers the emitting light of commercial ultraviolet (UV) ∼ 365 nm chip for possible lighting applications. Moreover, doping of Mn2+ into CNBC:30%Br− will retain the UV ∼ 365 nm excitation characteristics but with much strengthened intensity. The CNBC:30%Br−, Mn2+ yields robust broadband emission at 585 nm from the 4T1 (4G) → 6A1 (6S) transition of Mn2+, which after optimizing the Mn2+ concentration (about 15%) is about 72 times stronger than the emission of CNBC upon 365 nm excitation. Energy transfer from the self-trapping exciton (STE) state of halogen double perovskite to the Mn2+ activator, as well as the concentration quenching of Mn2+, were rationally proposed on the basis of experiments and theories. Using our prepared CNBC:30%Br−, 15%Mn2+ phosphor, a white light-emitting diode (WLED) with CIE chromaticity coordinate (0.35, 0.33) was fabricated by mixing commercial BaMgAl10O17:Eu phosphors on a UV ∼ 365 nm chip. Most interestingly, the CNBC:30%Br−, 15%Mn2+ can further host Er3+ and Yb3+ ions for a novel material that can be excited by 365 nm light for orange luminescence and by 980 nm for unique green up-conversion, respectively. With the help of screen printing, information encryption/decryption and optical anti-counterfeiting were practically carried out under irradiation of 365 and 980 nm, which can be further developed into a promising multi-level fluorescent anti-counterfeiting technology using these lead-free double perovskite systems.
研究领域:
材料科学
·
光学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Hang Liu,Zhi Ye,Ding Sun,Lixin Zhang,Xueyan Lv,Wentong Cai,Yuhong Zhang
Rear earth(RE)-doped halide perovskite has generated as an amazing optical material for multicolor luminescence. Free-lead halide double perovskites have attracted interesting because of their non-toxicity and higher instability. Here, RE 3+ doped chloride-based double perovskite phosphors are reported. A series of heavy concentration Ho 3+ /Yb 3+ doped Cs 2 NaBiCl 6 (CNBC) phosphors are prepared with a solvothermal route. The band structure of CNBC is calculated through density functional theory (DFT). The luminescence properties of CNBC:Ho 3+ and CNBC:Ho 3+ /Yb 3+ are investigated through upconversion(UC) and downshifting(DS) processes. From CNBC:Ho 3+ , the brightness orange, deep red and pale green lights are achieved under excitation at 365, 452 and 980 nm. The multicolor emissions of CNBC:Ho 3+ are used to multimode fluorescent anti-counterfeiting. Comparing with CNBC:Ho 3+ samples, the UC emission intensity of CNBC:Ho 3+ /Yb 3+ are dramatically enhanced. The brightness green light can be seen by naked eyes under super lower power pumping(∼10 mW). The temperature sensing properties of CNBC:Ho 3+ /Yb 3+ phosphor are investigated systematically based on the luminescence intensity ratio(LIR) of thermally coupled levels(TCLs)( 5 F 1 / 5 G 6 , 5 F 2,3 / 3 K 8 ) and non-TCLs( 5 F 4 / 5 S 2 , 5 F 5 ). The maximum relative sensitivity(S R ) reaches 5.089% K −1 at 293 K according to the LIR of non-TCLs. The work will broaden the application field of RE 3+ -doped free-lead perovskite such as anti-counterfeiting and thermometry.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 30
·4355-4363
·
IF 3.1
Ling Li,Yuwei Zhong,Yongfei Hu,Jilin Bai,Fen Qiao,Abdelaal S. A. Ahmed,Ghafar Ali,Xiujian Zhao,Yi Xie
All-inorganic lead halide perovskite (LHP) nanomaterials have been recognized as a competitive candidate for optoelectronic applications. However, the lead toxicity and intrinsic instability have limited their commercialization. Herein, a facile room-temperature approach is developed for the synthesis of an environmentally friendly all-inorganic orange-red-emitting Ag-doped and Mn-doped lead-free halide double perovskite Cs2NaBiCl6 (CNBC) in the shape of an octahedron. Only very weak orange-red photoluminescence (PL) is observed in the undoped CNBC octahedrons. However, both Ag and Mn doping heavily enhance the PL intensity of the CNBC samples. The stability of the representative Ag-doped and Mn-doped CNBC is studied under various conditions such as an ambient environment, high temperatures up to 400 °C, and UV irradiation. The alcohol-based photocatalytic performances of the samples are investigated by degradation of Rhodamine B (RhB), methyl orange (MO) and methylene blue (MB) in ethanol, demonstrating a strong and stable photodegradation activity. This work will offer a facile and cost-effective protocol in doped lead-free double perovskites as a stable and environmentally friendly alternative for environmental photocatalysts.
研究领域:
材料科学
·
化学
·
环境科学
·
纳米技术
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Yuhong Zhang,Xuezhong Yang,Hongqun Zhu,Chunhui Sun,Haoran Wang,Haozhou Tian,Hang Liu
Here, a new type of Sb 3+ ions alloying with RE 3+ (RE = Er, Ho) ions heavy concentration doped Cs 2 NaBiCl 6 double perovskites (DPs) was successfully synthesized by solvothermal method. The structure and morphology of all samples were characterized with X-ray diffraction, energy dispersive spectroscopy and X-ray photoelectron spectroscopy. The excitation and emission spectra for all samples are investigated in detailed. Under 354 nm excitation, a strong broad blue emission band from 400 to 500 nm is obtained in Cs 2 NaBiCl 6 :15 mol%Sb 3+ DPs. Compared with the Cs 2 NaBiCl 6 :RE 3+ sample, the emission intensities of Er 3+ and Ho 3+ ions for Cs 2 NaBiCl 6 :Sb 3+ /RE 3+ DPs are enhanced by 38 and 29 times due to alloying Sb 3+ ions, respectively. And the self-trapped exciton (STE) emission intensity is also dramatically increased. The energy transfer process from free exciton (FE) to STE and excited state level of RE 3+ contribute to increased luminescence intensity. In addition, the temperature-dependent luminescence spectra of Cs 2 NaBiCl 6 :Sb 3+ /RE 3+ samples were measured from 83 to 423 K. The luminescence thermal enhancement phenomenon is obtained at lower temperature range. At last, the anti-counterfeiting application of Cs 2 NaBiCl 6 :Sb 3+ /RE 3+ samples is elaborated due to their bright multi-color emission under different excitation and temperatures.
研究领域:
材料科学
·
光学材料
·
发光与光子学
·
稀土掺杂
·
防伪技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Yiying Zhu,Guoxun Sun,Yining Wang,Yixin Sun,Xiaole Xing,Mengmeng Shang
Doping lanthanide ions is an efficient method to modify the optical properties of lead-free double-perovskite halides. However, most lanthanide-doped double perovskites show a low luminescence efficiency and require a high excitation energy. Here, we have successfully prepared a series of Ho3+-doped Cs2NaBiCl6 microcrystals through a simple hydrothermal method and obtained strong characteristic emissions of Ho3+ at 492 and 657 nm under low-energy excitation (449 nm). After codoping Mn2+, apart from the characteristic emissions from Ho3+ under 450 nm wavelength excitation, the orangish-red luminescence consisting of the emission band centered at 591 nm from Mn2+ and a sharp emission peak at 657 nm from Ho3+ is obtained under 355 nm UV light excitation. Photoluminescence (PL) emission and excitation spectra, along with the PL decay curves, confirm the existence of an energy-transfer channel from Cs2NaBiCl6 to Mn2+ and then from Mn2+ to Ho3+. The enhanced absorption efficiency (10.5 → 70.7%) suggests that the codoping of Mn2+ overcomes the low absorption efficiency caused by f–f forbidden transitions of Ho3+. Finally, the diverse luminescent performance within the Cs2NaBiCl6:Ho3+, Mn2+ phosphor is realized by altering the excitation wavelength, thereby enabling its application in warm-white-light-emitting diodes and plant growth in this work.
研究领域:
材料科学
·
光学工程
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Aochen Du,Xingke Zheng,Genzhuang Li,Yun Ye,Enguo Chen,Sheng Xu,Tailiang Guo
The lead-free double perovskite, increasingly sought for optoelectronic pursuits, is distinguished by its notable stability, optical properties, and non-toxic characteristic. An extensive inquiry into the structural and photoelectric properties of Cs 2 NaBiCl 6 at heightened temperatures was undertaken using experimental evaluations and theoretical computations. The compound Cs 2 NaBiCl 6 , synthesized using a hydrothermal technique, was confirmed via various analytical methods. Advanced techniques such as high-temperature X-ray diffraction, X-ray fluorescence, X-ray photoelectron spectroscopy, and selected area electron diffraction were employed for the investigation of its crystal structure. Further investigation of microstructure was undertaken using electron microscopes. High-temperature luminescence stability disclosed a high exciton binding energy of 326 meV. The Huang-Rhys factor (6.4) denotes a robust electron-phonon coupling effect and facile formation of self-trapped excitons (700 nm). Applied first principles render valuable insight into structural and photoelectric nuances, notably at escalated temperatures. Cs 2 NaBiCl 6 as an indirect bandgap semiconductor and details the experimental and theoretical bandgap, which exhibits an increasing trend before subsequently declining at elevated temperatures. These results strongly support the material's high-temperature stability, emphasizing its applicability in applications such as rare-earth-doped phosphors. The dynamic stability of the material, evidenced by its mechanical performance, further underscores its potential for application in photoelectric devices.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2025
·
IF 7.2
Minkun Jin,Wang Chen,Changheng Chen,Yanqi Wu,Lukasz Marciniak,Chongfeng Guo
Chloride double perovskites have sparked significant interest and opened new avenues for luminescent materials hosts due to their lower phonon energy, flexible compositions, and excellent luminescent property. However, the instability to water has limited its fundamental applications, especially in the biological fields, although its stability has been improved in comparison with lead−based perovskites. Here, nanophosphor Cs 2 NaBiCl 6 : Nd 3+ , Yb 3+ (CNBC: Nd 3+ , Yb 3+ ) is prepared by a hot-inject method, and then its stability to water is enhanced by coating a layer of SiO 2 shell. For improving its photothermal conversion ability, organic photothermal agents IR780 is adsorbed on the surface of CNBC: Nd 3+ , Yb 3+ @SiO 2 to form monodispersed temperature self−monitoring photothermal agents CNBC: Nd 3+ , Yb 3+ @SiO 2 @IR780, where the temperature sensing property is based on the temperature−dependent lifetimes of Yb 3+ and the photothermal conversion property comes from the synergistic effect of IR780 and the nonradiative transition of Nd 3+ during luminescence. The maximum relative sensitivity and photothermal conversion efficiency of CNBC: Nd 3+ , Yb 3+ @SiO 2 @IR780 reach 1.44% K −1 at 280 K and 36.8%. Finally, the temperature detection and photothermal antimicrobial ability of CNBC: Nd 3+ , Yb 3+ @SiO 2 @IR780 are evaluated through chicken tissue temperature measurement and photothermal ablation effect against Escherichia coli and Staphylococcus aureus (93.3% and 95.1%).
研究领域:
材料科学
·
纳米技术
·
光学材料
·
生物医学工程
·
光热治疗
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 21
·2201182
·
IF 10.05
Keming Zhu,Zhiying Wang,Hanyu Xu,Zuoling Fu
Lead halide perovskites have been very promising for versatile optoelectronic applications, whereas the inherent toxicity and instability of lead halide restrict its wide application. Herein, a kind of high-performance multifunctional phosphor is designed based on heavy concentration Er 3+ -activated lead-free double perovskite Cs 2 NaBiCl 6 (CNBC), which realizes the self-sensitization of Er 3+ ions and emits high-brightness pure green emission upon dual near-infrared (dual-NIR) excitation. The luminescence properties can be further optimized by adding sensitizers (Yb 3+ /Nd 3+ ). Interestingly, the emission intensity of the green region is heightened by 212-fold after Yb 3+ ions doping, which is 40 times higher than that of the current popular phosphors (α-NaYF 4 :2%Er 3+ ,18%Yb 3+ ). Meanwhile, the temperature sensing properties of the thermally coupled levels (Er 3+ : 2 H 11/2 , 4 S 3/2 ) in Cs 2 NaBiCl 6 :40%Er 3+ are also investigated systematically based on the luminescence intensity ratio principle, and the maximum relative sensitivity is calculated to be as high as 1.27% K -1 (980 nm) and 1.57% K -1 (808 nm). Fortunately, the thermal stability and the performance for temperature readout of the studied phosphors are still maintaining a high level after doping sensitizers. The insights provided by this work will broaden the scope of lead-free halide double perovskites in the fields of luminescence and thermometry.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Di Wu,Yuting Wu,Qi Wang,Zhiling Guo,Xinyue Yang,Zhangwen Long,Dacheng Zhou,Jingchang Lin,Tao Han,Jianbei Qiu
Rare-earth (RE)-doped upconversion luminescence (UCL) materials are essential for advanced optoelectronic technologies, yet their performance is severely compromised by thermal quenching (TQ) at elevated temperatures, hindering practical deployment in high-temperature environments. In this study, we introduce a defect-mediated strategy to achieve thermally enhanced UCL in Yb 3+ /Er 3+ co-doped Cs 2 NaBiCl 6 double perovskites, focusing on the dynamic behavior of chloride vacancy-related centers (V Cl -related centers) and their possible role in modulating energy transfer between RE ions. By systematically tuning V Cl -related centers relative abundance through different processing routes and LiCl doping, we establish data-consistent mechanistic interpretation and a clear correlative relationship between defect-related states and the thermal enhancement of UCL emission. The ground sample, characterized by high defect density, exhibits a 2.1-fold increase in UCL intensity at 573 K compared to room temperature. With moderate LiCl doping (5%), the thermal enhancement factor increases to 5.9-fold—nearly three times greater than that of the undoped ground counterpart. Using electron paramagnetic resonance (EPR), Hall effect measurements, and fluorescence lifetime analysis, we show that defect-related states associated with V Cl are consistent with non-radiative trapping centers affecting the Yb 3+ -sensitized upconversion pathway under ambient conditions. Upon heating, the combined results are consistent with a thermally activated reconfiguration of the defect landscape, plausibly involving partial compensation or transformation of V Cl -related centers by mobile chlorine-related species, thereby suppressing non-radiative pathways and enhancing Yb 3+ →Er 3+ energy transfer efficiency. Critically, singly Er 3+ -doped samples show negligible thermal enhancement, confirming that the observed effect specifically targets Yb 3+ sensitizers rather than Er 3+ activators. This work provides a data-supported working model for thermally enhanced UCL in halide double perovskites and establishes a general defect-engineering approach for designing RE-doped UCL materials with superior resistance to thermal quenching. These advances open new avenues for applying such materials in extreme-environment optoelectronic devices, including high-temperature optical sensors and NIR-driven light sources.
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2026
·
IF 5.8
Yunong Wang,Yiting Wang,Bo Jiang,Ji Sun,Huiting Mao,Jindou Huang,Wei Zhang,Ruinian Hua
A dual-channel energy transfer in Ag + /Er 3+ co-doped Cs 2 NaBiCl 6 was revealed. • The energy transfer from STE to Er 3+ is a phonon-assisted cooperative foster energy transfer. • White LEDs with a single Ag + /Er 3+ co-doped Cs 2 NaBiCl 6 phosphors were achieved. Herein, the photoluminescence of hydrothermally synthesized Cs 2 NaBiCl 6 is controlled by Ag + and Er 3+ co-doping, and a dual-channel ET mechanism is proposed. When doped with Ag + , the photoluminescence of Cs 2 NaBiCl 6 increases by as much as 24.7 times. We have discovered that Ag + can reduce the band gap width, break the parity symmetry of the transition, and significantly enhance the strength of STE. Futher, new luminescence center was introduced in Ag + /Er 3+ co-doped Cs 2 NaBiCl 6 . Femtosecond transient absorption (fs-TA) spectroscopy data indicate that there exists a dual-channel ET process from (Ⅰ) the host to Er 3+ and from (Ⅱ) the host to the self-trapping exciton state and then back to Er 3+ . As the bridge of ET, Ag + alters the local symmetry of the Er 3+ site, significantly facilitating the energy transfer from STE to Er 3+ , and increasing the probability of Er 3+ radiation recombination. Futhermore, white LEDs with a single host phosphors have been achieved. Download: Download high-res image (145KB) Download: Download full-size image To address the problem of low photoluminescence efficiency in double perovskite materials, Ag + and Er 3+ were doped into Cs 2 NaBiCl 6 to enhance luminescence. Doping with Ag + increased the photoluminescence of Cs 2 NaBiCl 6 by 24.7 times. The energy transfer mechanisms among ns 2 metals, transition metals, and rare earth ions were investigated, and a dual-channel energy transfer mechanism was proposed. Furthermore, white LEDs using a single phosphor have been achieved, with color coordinates of (0.327, 0.338). This work provides a new perspective for designing novel double perovskites to realize unique dual-channel energy transfer and white LEDs.
✓ 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）