Advanced Optical Materials
·
2019
·Vol. 7
·期 8
·1801435
·
IF 7.125
Jun Zhou,Ximing Rong,Peng Zhang,Maxim S. Molokeev,Peijia Wei,Quanlin Liu,Xiuwen Zhang,Zhiguo Xia
The halide double perovskite family represented by A 2 (B + ,B 3+ )X 6 can overcome the lead toxicity and enable generally large band gap engineering via B/B sites' transmutation or exotic dopants to fulfill the emerging applications in the optoelectronic fields. Herein, the design and the experimental synthesis of a new family of Mn 2+ -doped Cs 2 NaBi 1- x In x Cl 6 crystals with an intense orange-yellow emission band are reported, and the phase formation stability is discussed via a combined experimental–theoretical approach. Depending on the manipulation of Bi 3+ /In 3+ combination, the band gap increases with In 3+ content, and a subsequent evolution from indirect to direct band gap is verified. First-principles calculations and parity analyses indicate a parity forbidden effect on Cs 2 NaInCl 6 , and a combination effect of absorption on Cs 2 NaBi 1- x In x Cl 6 from both Cs 2 NaBiCl 6 and Cs 2 NaInCl 6 . The associated Mn 2+ -doped photoluminescence depending on the Bi 3+ /In 3+ substitution is also addressed from the variation of the different Mn–Cl environment and neighboring-cation effect.
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 RARE EARTHS
·
2025
·
IF 7.2
Zehua Zhang,Lili Wang,Ruiliang Zuo,Zhenzhen Jiang,Guangyong Jin
The single-component white light emission microcrystals were synthesized in Bi 3+ /Sb 3+ /Ho 3+ ions tri-doped Cs 2 Ag 0.2 Na 0.8 LuCl 6 double perovskites by a simple precipitation method. In Bi 3+ /Sb 3+ ions double-doped Cs 2 Ag 0.2 Na 0.8 LuCl 6 microcrystals, the tunable emission from yellow (Bi 3+ ) to blue (Sb 3+ ) can be achieved under ultraviolet light excitation. Particularly, the white light emission is obtained after doping Ho 3+ ion because of the energy transfer processes of Bi 3+ →Ho 3+ and Sb 3+ →Ho 3+ . The chromaticity coordinates (CIE) of Cs 2 Ag 0.2 Na 0.8 LuCl 6 :5 mol% Bi 3+ ,1 mol% Sb 3+ ,15 mol% Ho 3+ microcrystal are (0.3354, 0.3394) under 315 nm excitation. Meanwhile, the white light emissions with different color temperatures are obtained through varying the excitation wavelength (255–365 nm). Additionally, temperature-dependent fluorescence spectra show that the emission intensity of Bi 3+ /Sb 3+ /Ho 3+ tri-doped Cs 2 Ag 0.2 Na 0.8 LuCl 6 microcrystal at 423 K remains 54% of that at 303 K. Moreover, the fluorescence intensity ratio (FIR) of 641 and 665 nm is highly temperature-dependent, the relative sensitivity ( S r ) reaches 1.06%/K at 303 K under 315 nm excitation. Simultaneously, the microcrystal shows thermochromism phenomenon, and the emission changes from white to blue-purple with the increase of temperature from 303 to 513 K. The novel temperature sensing is achieved based on CIE coordinates and temperature technology in Cs 2 Ag 0.2 Na 0.8 LuCl 6 :5 mol% Bi 3+ ,1 mol% Sb 3+ ,15 mol% Ho 3+ microcrystal by exciting at 315 nm. The corresponding maximum S r is 0.34%/K. Accordingly, Bi 3+ /Sb 3+ /Ho 3+ ions tri-doped Cs 2 Ag 0.2 Na 0.8 LuCl 6 double perovskite has potential applications in the fields of white light emitting diode and optical temperature sensing.
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
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Zhihao Zhang,Huimin Li,Ran Pang,Wenjing Wang,Da Li,Lihong Jiang,Su Zhang,Hongjie Zhang
Phosphor-converted light emitting diodes (pc-LEDs) are essential for current lighting and display areas because of their unique properties of being uncomplicated, durable and economical. In previous studies, Pr 3+ doped red-emitting phosphors have attracted enormous research interest due to their high color purity. However, their photoluminescence excitation (PLE) spectra are always hard to be combined with LED chips. This mismatch is a great obstacle to achieve Pr 3+ phosphors utilizing in LED devices. Here, to circumvent this issue, Pr 3+ -doped Ca 3 MgTiGe 3 O 12 (CMTG) red-emitting phosphor was optimized with PLE band shifting from 330 nm to 360 nm after tuning with Bi 3+ co-doping based on the structure and phosphorescence properties. The chip-matched excitation makes it a good candidate for white LEDs (wLEDs) fabrication to improve the output quality of device. Meanwhile, the high color purity of 93.02 % was obtained, which is conducive to widening the color gamut of backlight display applications. The photoluminescence (PL) spectra, fluorescence lifetime, and X-ray photoelectron spectroscopy (XPS) analysis were employed and discussed in detail to explain the role of Bi 3+ played in the system. Finally, wLEDs were fabricated with CMTG:Pr 3+ , Bi 3+ , showing a high color rendering index (Ra) of 94.4. And the color gamut covers ∼80 % of the National Television System Committee (NTSC) standard, suggesting great potential for applications of wLEDs and backlight display.
研究领域:
材料科学
·
发光材料
·
固态照明
·
显示技术
·
无机化学
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光电子学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 12
·期 6
·2053-2062
·
IF 6.4
Zixuan Huang,Jinju Zheng,Hui Fu,Jialiang Jiang,Zilong Li,Chunhong Gu,Zhentao Du,Yang Yang,Weiyou Yang,Jialong Zhao
Non-toxic lead-free vacancy-ordered double perovskites (DPs) are attracting more and more wide interest, thanks to their environment- and eco-friendly nature with exciting applications in modern optoelectronic devices. However, most intrinsic vacancy-ordered DPs exhibit a simple luminescence mode with poor photoluminescence (PL) quantum yield (QY). Herein, we report the exploration of ns2-type ion (Bi3+ and Sb3+) co-doped vacancy-ordered DP Cs2HfCl6 microcrystals (MCs) by a room-temperature precipitation method. Different to single-dopant analogues, the co-doped DPs deliver dual emission bands, which are sensitive to the excitation wavelength and tunable across the full-color region. It is verified that the emission band peaked at 460 nm should have originated from the triplet self-trapped excitons (STEs) of Bi3+ with a lifetime of hundreds of nanoseconds, while that peaked at 590 nm should be ascribed to the microsecond-timescale STEs of Sb3+, respectively. Accordingly, based on these co-doped DPs, high-performance devices such as multi-color anti-counterfeiting and single-component white light emitting diodes (WLEDs) (CIE = (0.344, 0.337), CRI = 84) have been achieved. Moreover, the as-assembled optical temperature sensor exhibits relative sensitivity (SR) and absolute sensitivity (SA) of 1.2% K−1 and 0.013 K−1, respectively, representing their bright future toward multifunctional optoelectronic applications.
研究领域:
材料科学
·
光学工程
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 13
·2506-2512
·
IF 5.066
X. Y. Liu,H. Guo,Y. Liu,S. Ye,M. Y. Peng,Q. Y. Zhang
The design of white-light luminescent materials with excellent thermal stability is still a challenge in the field of white-light emitting diode (W-LED) application. In this paper, a pair of novel Bi3+/Mn2+ ions co-doped into white-emitting borosilicate glasses were successfully prepared using a melt-quenching method. Their luminescence properties were evaluated using transmission spectra, photoluminescence excitation and emission spectra in the temperature range of 300–573 K, and lifetime decay curves. Upon excitation with a ultraviolet (UV) light, the co-doped glasses exhibit intense tunable emitting color between the blue and the orange-red region due to efficient energy transfer from Bi3+ to Mn2+, and a perfect white light emission is realized by appropriately adjusting the Mn2+ concentrations. Furthermore, the Bi3+ singly doped glass presents good thermal stability, showing about 72.3% of the observed room temperature (300 K) emission intensity at 423 K, while the thermal stability becomes lowered after Mn2+ ions are incorporated into the singly doped sample, attributed to serious thermal quenching from Mn2+. This work may help to better understand the interactions between Bi3+ and transition metal ions, and it might also be helpful in the future design of organic resin-free W-LEDs.
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
Reziwanguli Yantake,Aierken Sidike,Palidan Aierken,Taximaiti Yusufu
In the field of luminescent materials, the search for good substrates and the use of a single substrate to excite near-ultraviolet chips to produce white LED devices has always been of great interest. This study utilized energy transfer between Bi 3+ and Eu 3+ to design KAlSiO 4 : 0.02Bi 3+ , 0.04Eu 3+ red emission phosphors with a potassium nepheline structure, which were calcined in air with a high-temperature solid-state method. Under 286 nm excitation, energy transfer between Bi 3+ and Eu 3+ up to 85.9 %. Through DFT theoretical calculations, it was found that the bandgap of the matrix was 4.86 eV, KAlSiO 4 : 0.02Bi 3+ , 0.04Eu 3+ has excellent heat quenching resistance, and the emission intensity at 150 °C is 92.9 % of that seen at room temperature . Second, by doping with Eu 2 O 3 and calcining in a reducing atmosphere, KAlSiO 4 : 0.02Eu 2+ , 0.1Li + broadband blue emitting phosphors were obtained. Finally, KAlSiO 4 : 0.02Bi 3+ , 0.04Eu 3+ was mixed with KAlSiO 4 : 0.02Eu 2+ , 0.1Li + to prepare a near-ultraviolet white LED device. The color rendering index of the device reached 87.1, the color coordinates were (0.3328, 0.3015), and the color temperature was 5422 K. These results proved that KAlSiO 4 : 0.02Bi 3+ , 0.04Eu 3+ samples have potential for use in near-ultraviolet white LEDs and that KAlSiO 4 is a good substrate in the field of luminescence. This work provides a new breakthrough in the use of a single substrate to prepare multiple colored fluorescent powders and mix them together to produce white LED devices.
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
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ligan Ma,Fumin Lu,Qingqing Yu,Peican Dai,Fangfang Hu,Hai Guo,Rongfei Wei
Nowadays, multi-mode luminescent thermometry has emerged as a strongly promising noncontact temperature-sensing technique, in which can realize the temperature determination more reliable and accurate by incorporating the excellent temperature monitoring properties from different modes of sensing. Herein, three-mode optical thermometry technics were triumphantly designed in thermochromic Gd 2 GaSbO 7 (GGS):Bi 3+ ,Eu 3+ phosphors. With ascending temperature, the emission color of GGS:Bi 3+ ,Eu 3+ varies remarkably from pink to yellow with the thermo-caused chromaticity shift reaching 0.2505, being easily differentiated by our eyes. Employing the fluorescence intensity ratio of well-separated emission bands of Bi 3+ and Eu 3+ , outstanding relative sensitivity ( S R ) of 1.03% K - 1 , favorable temperature uncertainty of 0.296 K, excellent reversibility and repeatability are acquired. Moreover, profiting by the rapid decline of fluorescence decay lifetime of Bi 3+ ( 3 P 1 ) in GGS:Bi 3+ ,Eu 3+ with temperature elevating, the optimal S R reaches 0.75% K - 1 at 473 K, higher than most reported optical thermometers. These discoveries indicate that GGS:Bi 3+ ,Eu 3+ phosphors have fantastic prospects in multi-mode temperature detection and high temperature warning areas.
研究领域:
材料科学
·
光学工程
·
温度传感技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2024
·
IF 6.4
Hailin Zhou,Zexiang Liu,Xiangyan Yun,Hanlin Hu,Haizhe Zhong,Henan Li,Yumeng Shi
Lead-free 0D In-based organic–inorganic metal halides (OIMHs) have attracted tremendous attention because of their nontoxicity, environmental stability, and excellent photoluminescence properties. However, it remains controversial and unclear whether the luminous division exists in ns 2 doping In-based materials, as the majority of In-based materials are considered non-luminous. Herein, a series of Bi 3+ -doped (TEA) 2 InCl 5 (TEA = tetraethylammonium) crystals are synthesized and it is determined that the blue emission stemmed from Bi ions. Remarkably, the photoluminescence quantum yield (PLQY) of the blue emission at 469 nm reached 69.69% under 371 nm excitation, exceeding those of previously reported Bi 3+ -doped OIMHs. In addition, pristine and Bi 3+ -doped compounds exhibited excellent structure and optical stability under humid conditions. This study provides new insights into the photoluminescence properties of In-based OIMHs, especially regarding the high-efficiency emission of Bi 3+ -doped materials.
研究领域:
材料科学
·
光电
·
化学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Yangxian Huang,Dawei Lan,Guangliang Zhang,Riran Zang,Kunsong Hu,Man Mo,Zhijie Fang,Weijian Li,Haiqing Zhan,Xianquan Ming,Guanhan Huang,Guiliang Li,Minfeng Huang,Feng Zhan
The lead-free double perovskite with low toxicity and good performance stability has attracted much attention in optoelectronic device applications. But their photoluminescence quantum yields (PLQY) are low, which limits their applications. Co-doping and alloying are the most valuable methods to improve its PLQY and stability. In this study, we successfully synthesized Bi 3+ and Fe 3+ co-doped Cs 2 Ag 0.6 Na 0.4 InCl 6 double perovskite using the hydrothermal method , and the emission mechanism was further investigated. Under UV-light excitation, the Cs 2 Ag 0.6 Na 0.4 InCl 6 : Bi 3+ /Fe 3+ shows dual emission. This emission results from the modification effect of self-trapped exciton (STE) formation, and Fe 3+ induces longer wavelength emission. By changing the doping contents of Bi 3+ and Fe 3+ , the revolution of double perovskite color from yellow to orange-red can be observed, and its PLQY is up to 39.95%. The studies of the PL emission mechanism reveal that energy transfer occurs between the STE and Fe 3+ , and different doping contents can affect this transfer mechanism. This work has implications for producing double perovskite for optoelectronic semiconductors and provides direction for designing new lead-free double perovskites.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 6
·1-7
·
IF 2.8
Yuan Lifang,Wang Junzhong,Huang Zhijin,Shen Kaixiang
Long afterglow phosphors have garnered significant attention for their ability to emit light long after excitation ceases. Afterglow emission relies on metastable trap levels within the bandgap of the host materials. Effective trap engineering strategies to optimize traps are critical in determining the afterglow performance. In this study, we investigate the codoping of Bi 3+ and Er 3+ into LiTaO 3 to enhance afterglow performance. Through high-temperature solid-state synthesis, a series of LiTaO 3 :x%Bi 3+ , y%Er 3+ (x = 0 or 0.5%, y = 0.1–4.0%) samples were prepared successfully. Structural characterization confirmed the successful incorporation of Bi 3+ and Er 3+ into the Li⁺ sites without disrupting the host lattice. Photoluminescence studies revealed that Bi³⁺ codoping significantly enhances the green emission of Er³⁺, with optimal performance achieved at 1.0% Er 3+ doping. Thermoluminescence (TL) analysis demonstrated the presence of traps with the depth of 0.748 eV, enabling prolonged afterglow emission at room temperature. The afterglow mechanism involves charge carrier storage in traps under UV excitation, followed by thermal release and recombination at luminescent centers, facilitated by energy transfer from Bi 3+ to Er 3+ . This work provides a strategy for designing a long afterglow phosphor through controlled codoping, offering insights into trap engineering and energy transfer processes in perovskite-based luminescent materials.
研究领域:
材料科学
·
光学材料
·
固体物理
·
发光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Qiaohui Liao,Qian Meng,Liang Jing,Jiamin Pang,Qi Pang,Jin Zhong Zhang
In this study, a facile approach is used to enhance the broad orange emission efficiency and stability as well as monodispersity of Cs2AgInCl6 nanocrystals (NCs) via doping Bi3+ and surface passivation with potassium bromide. While the pristine Cs2AgInCl6 NCs show an excitonic absorption peak at 280 nm, the doped NCs have an additional absorption peak at 365 nm, which is attributed to direct bismuth s–p transition. Compared to the low photoluminescence (PL) quantum yield (QY) of 0.04% for the pristine Cs2AgInCl6 NCs due to parity forbidden transition, the doped NCs show a PLQY of 5.82%, a significant improvement due to breaking of the parity forbidden transition. The PLQY can be further increased to 8.59% for Cs2AgIn0.9Bi0.1Cl6 when passivated with KBr. This work demonstrates that the combination of doping and surface passivation can substantially improve the PL of the Cs2AgInCl6 double perovskite. A model is proposed to explain the observed enhancement in PL and stability.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yan Yang,Huaiwu Zhang,Jie Li,Yiheng Rao,Gang Wang,Gongwen Gan
Miniaturization, high frequency capability, low loss, and matching impedance play critical roles in new generation antennas. Although ferrite ceramics show a great potential as antenna substrate materials, some challenges still remain associated with their application to high performance antennas. In this work, we synthesized Bi 3+ -substituted NiCuZn ferrite to adjust the microstructure, magnetic, and dielectric properties at low sintering temperatures . It is shown that Bi 3+ substitution not only enhances grain growth and compactness of NiCuZn ferrite at low sintering temperatures, but also effectively tailors the permeability, permittivity, and loss factor. In particular, NiCuZn ferrite doped with 0.025 wt%, of Bi 2 O 3 possesses excellent performance with high permeability (~29.1), high n factor (~22.76), appropriate matching impedance (Z factor = 1.28), and low loss tangents (tanδ μ = 0.00853, tanδ ε = 1.22683 × 10 -4 ). In addition, the dielectric loss is significantly reduced and becomes as low as magnetic loss at high frequencies; the typical tanδ ε reduces to 1.94 × 10 -6 , and tanδ ε / ε ´ is greatly decreases to 0.137 × 10 -6 at 50 MHz. Thus, Bi 3+ -adjusted NiCuZn ferrites open up new opportunities for applications in high-frequency LTCC antennas.
研究领域:
材料科学
·
电子工程
✓ 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）