Advanced Optical Materials
·
2023
·
IF 9
Shumei Wang,Chuang Ma,Xinmei Liu,Wenliang Huang,Tinghuan Yang,Chenxing Li,Haochen Ye,Zhan Liu,Lei Yin,Ningyi Yuan,Jianning Ding,Lihua Chen,Kui Zhao
Perovskite nanocrystals (NCs), such as MAPbX 3 (MA + = methylammonium; X = Cl, Br, or I), have received attention owing to their excellent optoelectronic properties and ease of integrating with flexible substrates. Lanthanide ion doping is widely used as an effective strategy to enhance the optoelectronic performance of perovskite NCs. However, incorporating the lanthanide dopant and ensuring the emission stability of the perovskite NCs in high-performance optoelectronic devices remains a major challenge. Herein, the synthesis of Eu 2+ -doped MAPbBr 3 NCs within the channels of SBA-15 is presented to improve their stability. The doped MAPbBr 3 NC@SBA-15 composites exhibit significantly improved stability than that of undoped MAPbBr 3 NCs. The doped MAPbBr 3 NC@SBA-15 composites exhibit moderate PL quantum yields and excellent stability under ambient conditions and UV irradiation. In addition, the MAEu 0.3 Pb 0.7 Br 3 NC@SBA-15 composite applied in white-light-emitting diodes (WLEDs) achieves a color rendering index of 73.5. Moreover, MAEu 0.3 Pb 0.7 Br 3 NC@SBA-15 can be combined with styrene-ethylene-butylene-styrene to fabricate a flexible direct X-ray detector, realizing a high sensitivity of 7592.2 µC Gy air −1 cm −2 and a low detection limit of <77 nGy air s −1 ; this is an outstanding value for a NC-based flexible direct X-ray detector. This work serves as a guide for the design of perovskite NCs for both WLEDs and flexible X-ray detectors.
研究领域:
材料科学
·
光学工程
·
电子器件
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Guoxiang Song,Chaogang Lou,Bowen Shen,Zi Wang,Ruiqi Zhu
We achieved a quantum cutting process in Pr 3+ -Yb 3+ co-doped CaF 2 that converts one visible photon into two near-infrared photons matching the silicon band gap. In this study, the quantum cutting process between Pr 3+ and Yb 3+ was experimentally verified through comparative analysis of the normalized absorption spectrum of Pr 3+ and the near-infrared excitation spectrum of Yb 3+ . Fluorescence lifetime measurements at the optimal doping concentration revealed an energy transfer efficiency of 60.99% from Pr 3+ to Yb 3+ . Temperature-dependent luminescence spectroscopy further estimated the luminescence efficiencies as 64.49% (Pr 3+ ) and 71.41% (Yb 3+ ). Based on these results, the theoretical quantum efficiency of the Pr 3+ →Yb 3+ system was obtained to be about 112.26%, confirming the occurrence of efficient photon down-conversion. Considering the limited energy gain from sunlight due to the narrow-band absorption of Pr 3+ by f-f forbidden transition, Eu 2+ ions were employed to perform broadband sensitization on the quantum cutting process of Pr 3+ -Yb 3+ . Studies have suggested that the incorporation of Eu 2+ can effectively assimilate the 250-400 nm band and transfer energy to Pr 3+ and Yb 3+ , causing them to emit stronger near-infrared spectra. These developed materials are capable of converting ultraviolet-visible photons into near-infrared photons matching the silicon bandgap, which reduces energy loss caused by spectral mismatch and has promising applications in silicon-based photovoltaics.
研究领域:
材料科学
·
光子学
·
无机非金属材料
·
能源材料
·
固体发光
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Jinlong Wang,Zihan Zhao,Yiping Wu,Chunwen Ye,Yanjie Zhang
Advanced fluorescent anticounterfeiting technology has received widespread attention due to the lack of sufficient security of traditional anti-counterfeiting. Hence, there is a great challenge to continuously develop multi-level anti-counterfeiting technology with higher security. Here, we develop a desired fluorescent anticounterfeiting technology based on CsPbBr3 perovskite quantum dots (PQDs) and CaAl2O4:Eu2+, Nd3+ composites with persistent luminescence properties. CsPbBr3 PQDs can be formed on the surface of the CaAl2O4 host and exhibit an average diameter of around 3.5 nm. The photoluminescence (PL) intensity of CsPbBr3 PQDs/CaAl2O4 composites is greatly enhanced to 125 times compared to that of pure CsPbBr3 PQDs, and the desired narrow FWHM of 19 nm is achieved under near-ultraviolet irradiation. Furthermore, highly stable CsPbBr3 PQDs/CaAl2O4:Eu2+, Nd3+ composites with triple-modal (UV, IR, and thermal) fluorescent anti-counterfeiting characteristics were developed and used in fabricating anti-counterfeiting labels through screen-printing technology. The results open up a pathway to enhance the photoluminescence properties and stability of perovskite quantum dots for the advanced fluorescent anticounterfeiting application.
研究领域:
材料科学
·
光电技术
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2024
·
IF 8.4
Weibin Chen,Yuzhen Wang,Gaochao Liu,Yongsheng Sun,Zhiguo Xia
Laser phosphor display technology plays an important role in advanced display projection; however, it is a challenge in maintaining excellent color accuracy under high brightness due to the lack of red spectrum. Here, red-emitting Mg 2 Al 4 Si 5 O 18 :Eu 2+ ceramics as the phosphor wheel have been optimized in chemical compositions and texture orientation. The textured Mg 2 Al 4 Si 5 O 18 :Eu 2+ ceramics have high transparency and spot limiting ability, accordingly, the ceramic wheel outputs 1184 l m of ultra-bright red light under 50W·mm −2 laser power density. Moreover, the red spectral utilization (＞600 nm) of textured Mg 2 Al 4 Si 5 O 18 :Eu 2+ ceramics is 2.17 times that of traditional Y 3 Al 5 O 12 :Ce 3+ phosphor wheel. The red-emitting textured Mg 2 Al 4 Si 5 O 18 :Eu 2+ cordierite ceramic herein enables an improved light-color saturation experience, and it is potential in the next-generation laser phosphor display applications.
研究领域:
材料科学
·
光电技术
·
显示技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Pu Fan,Zefeng Xu,Qi Luo,Zongjie He,Yuhui Chen,Qiqi Miao,Cong Huang,Xiaoguang Liu,Ling Li
Phosphor-converted white LEDs are realized by combining blue InGaN chips with yellow and red emitting materials. Due to the lack of efficient red phosphor materials, we can design a broadband yellow phosphor material containing as many red components as possible. We found an abnormal broadband yellow-emitting Ba 2 CaB 2 Si 4 O 14 :Eu 2+ borosilicate phosphor inspired by natural minerals, which has been synthesized by traditional high temperature solid-state method. The structural information and photoluminescence characteristics of Ba 2 CaB 2 Si 4 O 14 :Eu 2+ were characterized in detail, and applied to the fabrication of white LED devices. Excited by near ultraviolet light at 365 nm, it displays a wide emission band from 400 to 800 nm centered on the 595 nm peak. White LED devices were fabricated by physically mixing the yellow phosphor Ba 2 CaB 2 Si 4 O 14 :Eu 2+ and synthesized blue phosphor BaMgAl 10 O 17 :Eu 2+ with 365 nm UV chip as excitation. The correlation color temperature (CCT) value and the chromaticity coordinates of the fabricated WLED devices were found to be 5522 K and (0.3293, 0.3036) respectively. In conclusion, Ba 2 CaB 2 Si 4 O 14 :Eu 2+ has great potential in the preparation of near UV excited white LEDs.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
HIGH TEMPERATURE MATERIALS AND PROCESSES
·
2021
·Vol. 40
·期 1
·389-396
·
IF 0.826
Yingwei Xu,Tingting Zhang,Li Zheng,Ailing Zou
KBaPO 4 :Eu 2+ /Sm 3+ phosphor was synthesized via the high-temperature solid-phase reaction method. The structural properties, surface morphology, and optical properties of the synthesized samples were obtained by the X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and fluorescence measurements. The XRD patterns indicate that the crystal structure of KBaPO 4 has not been changed by co-doped with two rare-earth ions. Under the excitation of 400 nm, the Eu 2+ and Sm 3+ co-doped KBaPO 4 phosphors showed typical emission peaks at 430 (blue), 562 (yellow), and 600 nm (red). Meanwhile, with the increase of the Sm 3+ content, the photoluminescent (PL) emission intensity of Sm 3+ increased until the content reaches 0.12. However, the PL intensity of Eu 2+ ions gradually decreased, which indicated that there was a possible energy transfer between the two ions. Therefore, the obtained results indicated that Eu 2+ /Sm 3+ co-doped KBaPO 4 is a promising phosphor for the use in white light-emitting diodes with near ultraviolet chips.
研究领域:
材料科学
·
光电技术
·
固体物理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Zihao Wang,Sisi Liang,Chenyang Zhan,Kunyuan Xu,Jie Hu,Dejian Chen,Liping Song,Haomiao Zhu
Full-spectrum phosphor-converted white-light-emitting diodes (pc-WLED) are emerging as a mainstream technology in semiconductor lighting. Nevertheless, high-performance blue phosphor which can be excited efficiently by a 400 nm NUV diode chip is still lacking. Herein, we present a blue-emitting Na 3 KMg 7 (PO 4 ) 6 :Eu 2+ phosphor synthesized by the solid-reaction method. Particularly, we find that the using of Li 2 CO 3 as flux can significantly improve the crystal quality and thus the emission efficiency of the phosphor. Meanwhile, the excitation peak of the phosphor shifts from 365 to 400 nm, which is pivotal for efficient NUV (400 nm) diode chip excitation. The practical Eu 2+ concentration is also enhanced by using Li 2 CO 3 as flux, and the absorption efficiency is greatly increased. This phosphor exhibits superior PL thermal stability, namely retains 94% integrated photoluminescence intensity at 150 °C of that at 25 °C. As a result, the optimized phosphor shows an emission band peaked at 437 nm with a bandwidth of 40 nm and a high external photoluminescence quantum yield of 51.7%. Finally, a pc-WLED was fabricated by using NKMPO:Eu 2+ blue, Sr 2 SiO 4 :Eu 2+ green, CaAlSiN 3 :Eu 2+ red phosphors, and a 400 nm NUV diode chip. It shows a high color rendering index of R a = 96.4 and a correlated color temperature of 4358 K. These results prove that NKMPO:Eu 2+ is a promising blue phosphor for full-spectrum WLED based on NUV diode chips.
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
LUMINESCENCE
·
2024
·Vol. 39
·期 7
·e4836
·
IF 3.2
Guoxiang Song,Chaogang Lou,Ruiqi Zhu,Han Diao,Bowen Shen
The near-infrared (NIR) down-conversion process for broadband sensitization has been studied in Eu 2+ -Nd 3+ co-doped BaAl 2 O 4 . This material has a broad absorption band of 200–480 nm and can convert photons in the visible region into NIR photons. The NIR emission at 1064 nm, attributed to the Nd 3+ : 4 F 3/2 → 4 I 11/2 transition, matches the bandgap of Si, allowing Si solar cells to utilize the solar spectrum better. The energy transfer (ET) process between Eu 2+ and Nd 3+ was demonstrated using photoluminescence spectra and luminescence decay curves, and Eu 2+ may transfer energy to Nd 3+ through the cooperative energy transfer (CET) to achieve the down-conversion process. The energy transfer efficiency (ETE) and theoretical quantum efficiency (QE) were 68.61% and 156.34%, respectively, when 4 mol% Nd 3+ was introduced. The results indicate that BaAl 2 O 4 :Eu 2+ -Nd 3+ can serve as a potential modulator of the solar spectrum and is expected to be applied to Si solar cells.
研究领域:
材料科学
·
光电技术
·
可再生能源
·
光子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Kangliang Peng,Huiqing Xu,Xueqing Yang,Lin Chen,Lifang Chen
The exploitation of phosphors with tunable color emissions is of great significance in the field of display and lighting. Herein, a series of Eu 3+ /Dy 3+ /Eu 2+ ions single-/multiple-doped NaMgPO 4 phosphors have been successfully synthesized via a high-temperature solid-state reaction method. The luminescence properties of the synthesized NaMgPO 4 phosphors were systematically investigated. The incorporation of Dy 3+ enables the tuning of emission peaks in NaMgPO 4 :Eu 3+ phosphors through an efficient energy transfer (ET) process from Eu 3+ to Dy 3+ , thereby facilitating white light emission in a single-composition phosphor. Eu 3+ and Eu 2+ co-activated NaMgPO 4 phosphors were achieved by controlling the reduction of Eu 3+ to Eu 2+ under a reducing atmosphere generated by activated carbon. Photoluminescence (PL) spectra revealed simultaneous blue emission from Eu 2+ and red emission from Eu 3+ . By varying the amount of activated carbon, tunable emission colors can be realized in the Eu 3+ /Eu 2+ codoped NaMgPO 4 phosphors. Consequently, through the strategic design of rare-earth ion codoping, the Eu 3+ /Dy 3+ /Eu 2+ ions single-/multiple-doped NaMgPO 4 phosphors exhibit promising practical applications in phosphor-converted white light-emitting diodes (LEDs).
研究领域:
材料科学
·
发光材料
·
光电子学
·
固态化学
·
照明技术
✓ 已验证
产品关联
DOI
高影响因子
Heliyon
·
2022
·
IF 3.776
Hao Song,Xiuping Wu,Yanjie Zhang,Shichang Xu,Bing Li
Deep-trap luminescent materials have attracted great attention for optical information storage applications. However, the flexible luminescence films based on red luminescence materials with temperature and infrared response are scarce. In this study, we have successfully developed various novel flexible red emitting films based on Eu 2+ /Dy 3+ co-doped Sr 2 Si 5 N 8 phosphors through screen-printing and spin-coating technologies, respectively. Interestingly, the fabricated flexible luminescence films exhibit unique temperature and infrared responsive properties for optical information storage by releasing photons in response to thermal or infrared stimulation. Notably, deep-trap red emitting Eu 2+ /Dy 3+ co-doped Sr 2 Si 5 N 8 phosphors are crucial for the optical information storage properties of the films. Two emission peaks of Sr 2 Si 5 N 8 :Dy 3+ phosphors at 476 nm and 577 nm are observed under excitation at 345 nm, corresponding to the radiative transition occurs from the 4 F 9/2 level to the 6 H 13/2 and 6 H 15/2 levels of Dy 3+ . When Dy 3+ and Eu 2+ ions are co-doped in Sr 2 Si 5 N 8 , the energy transfer from Dy 3+ to Eu 2+ in Sr 2 Si 5 N 8 matrix is found and the decay time confirms that Dy 3+ ions can be acted as deep trap centers to storage photons. For Sr 2 Si 5 N 8 :Eu 2+ ,Dy 3+ phosphors and the corresponding flexible luminescence films, the specific patterns (for example apple and note patterns) are firstly recorded under NUV or blue light excitation and then reappear through thermal stimulation or near-infrared photo-stimulation (980 nm laser). This work not only validates the feasibility of Sr 2 Si 5 N 8 :Eu 2+ ,Dy 3+ phosphors as deep-trap red emitting luminescence materials, but also suggests the applications of flexible luminescence films for optical information storage.
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
Zhichao Zhang,Jun Zhou,Jintai Wen,Fangnan Liang,Fang Zhang,Qianxiu Liu,Jifan Hu
Currently, data-driven methodologies for discovering advanced luminescent materials are receiving considerable focus, driven by the potential to expedite material development timelines and provide multi-faceted insights into material properties. This study implements machine learning to develop a predictive model for emission wavelengths in Eu 2+ -activated A I B II PO 4 -type phosphors, thereby advancing rational design strategies. Furthermore, the model's performance is rigorously evaluated by synthesizing a novel Na 18 Ca 13 Mg 5 (PO 4 ) 18 :Eu 2+ phosphor and comparing its emitting wavelength with the value predicted by the model, showing satisfactory agreement. The compound Na 18 Ca 13 Mg 5 (PO 4 ) 18 exhibits a glaserite-type crystal structure and belongs to the R-3m space group of the Trigonal crystal system. The Eu 2+ -activated Na 18 Ca 13 Mg 5 (PO 4 ) 18 phosphor demonstrates intense broadband absorption spanning 250–400 nm in the near-ultraviolet region, emitting bright blue-cyan luminescence under 365 nm excitation. The high Ra (93.3) and low correlated color temperature (CCT: 5096 K) values of the as-fabricated w-LED lamp indicate that Na 18 Ca 13 Mg 5 (PO 4 ) 18 :Eu 2+ can act as a promising blue-cyan-emitting phosphor for full-spectrum healthy lighting applications.
研究领域:
材料科学
·
机器学习
·
光电子学
·
固态照明
·
晶体学
·
发光材料
·
数据驱动发现
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Kuo Shen,Ruiting Zhang,Yahong Jin,Yanmei Li,Yihua Hu
X-ray storage phosphors are found wide-ranging applications in medical diagnosis, nondestructive testing and X-ray imaging. However, designing X-ray storage phosphors with high electron storage capacity still poses a daunting challenge. In this study, we designed a fluorescent powder based on Eu 2+ -doped BaSiO 3 , demonstrating excellent optical information storage characteristic. Under high-energy X-ray filling, shallow traps exhibit low electron capacity and only produce weak afterglow, which greatly helps to minimize the impact of afterglow on the image quality during X-ray imaging. In addition, the deep traps at 1.01 eV filled with high-energy X-ray allow the material to store information for a long time. The crystal structure, photoluminescence (PL) and thermoluminescence (TL) spectra were studied systematically. The electron trapping properties of the material were analyzed using TL spectroscopy. Finally, we fabricated a flexible film with phosphors, the flexible film has been utilized to demonstrate high-quality real-time X-ray imaging and achieve time-delayed X-ray imaging of curved objects, such as flexible circuit boards.
研究领域:
材料科学
·
医学成像
·
放射学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）