JOURNAL OF RARE EARTHS
·
2024
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IF 5.2
Deyuan Yang,Ruirui Cui,Chaoyong Deng
Optical thermometry has attracted great attention because it enables accurate temperature measurement in harsh environments due to non-contact temperature measurement. Three-dimensional (3D) lead-free halide perovskites have a great application potential in this field, due to its outstanding luminous properties and stability. In this work, the Sb 3+ and Er 3+ are introduced in Cs 2 NaYCl 6 double perovskites (DPs). The Sb 3+ doping Cs 2 NaYCl 6 DPs exhibits bright blue emission from the Sb 3+ activated self-trapped excitons (STEs) and Sb 3+ ,Er 3+ co-doped Cs 2 NaYCl 6 has efficient green emission with excellent photoluminescence quantum yields (PLQY) of 81.1% because of the presence of energy transfer from self-trapped excitons to Er 3+ ions. Excitingly, the ratio between the fluorescence intensity at 524 nm and 550 nm (FIR( I 524 nm / I 550 nm )) and the ratio between the fluorescence intensity at 524 and 456 nm (FIR( I 524 nm / I 456 nm )) both have a high correlation with temperature in the range of 298–473 K. The maximum of relative sensitivity values reach to 1.18%/K ( I 524 nm / I 550 nm ) and 1.19%/K ( I 524 nm / I 456 nm ) at 298 K, respectively. The outstanding temperature sensitivity suggests that the Sb 3+ ,Er 3+ co-doped Cs 2 NaYCl 6 has enormous application potential in ratiometric optical thermometry.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Songchao Bai,Hao Liang,Chao Li,Cunduo Tang,Gang Yang,Xiumei Xu,Xingqiang Yang,Gencai Pan,Yongsheng Zhu
Lead-free perovskites are a new type of luminescent material with non-toxic, stability and excellent photoelectric properties, which have great application in the field of photoelectric detection, solar cells, bio-imaging, etc. Here, we reported a new kind of uniform spherical rare-earth based double perovskite Cs 2 NaYCl 6 nanocrystals (NCs) as versatile hosts to accommodate ionic dopants for improving photoelectric properties especially the luminescent properties. In contrast to the low quantum yield of only 5.62%, the luminescent intensity of Cs 2 NaYCl 6 NCs can be impressively enhanced via doping Sb 3+ and Mn 2+ ions in the rare earth-based double perovskite lattices. For the Sb 3+ -doping, the photoluminescence quantum yield (PLQY) increases from 5.62% to 22.48%. On this basis, the luminescence colors can be tuned from blue to white and red via Mn 2+ ions doping and the maximum PLQY can be further improved to 38.66%. Finally, the Sb 3+ , Sb 3+ /Mn 2+ ions doped Cs 2 NaYCl 6 NCs based blue, red and white LEDs were explored, which indicates that these are potential materials in multicolor LEDs applications.
研究领域:
材料科学
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光电技术
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纳米技术
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yinhua Wang,Songchao Bai,Jie Sun,Hao Liang,Chao Li,Tianya Tan,Gang Yang,Jiwei Wang
Near-infrared (NIR) luminescent materials have been widely used in biomedicine, optical communication and other fields due to their unique photophysical properties. However, the development of efficient NIR luminescent materials is still a challenge. Herein, Sb 3+ , Tm 3+ co-doped Cs 2 NaYCl 6 double perovskite single crystals (SCs) have been synthesized. Benefiting from the crystal structure and rare earth lattice of rare earth-based double perovskite host, lanthanide ions can be doped effectively, and the optimal NIR photoluminescence quantum yield (PLQY) of Cs 2 NaYCl 6 :Sb 3+ , Tm 3+ SCs is up to 20.2%. The energy transfer mechanism was systematically surveyed by steady-state spectroscopy. Furthermore, a compact visible and NIR light emitting diode was fabricated by coating Cs 2 NaYCl 6 :Sb 3+ , Tm 3+ SCs on a commercial 320 nm LED chip. This light source has a promising application prospect in multifunctional lighting.
研究领域:
材料科学
·
光学
·
生物医学工程
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·
IF 9
Xiu-Xian Guo,Jun-Hua Wei,Jian-Bin Luo,Zi-Lin He,Zhi-Zhong Zhang,Jing-Hua Chen,Dai-Bin Kuang
Single-source white-light emitters are highlighted with stable color and excellent color rendering ability, which can largely simplify the white-light-emitting-diode (WLED) structure. All-inorganic and lead-free double perovskites have attracted extensive research interest and provide versatile doping sites to accommodate the extrinsic multi-valent ions. Herein, the synthesis and tunable emission of Sb 3+ –Ln 3+ -codoped Cs 2 NaYCl 6 single crystals (SCs) is reported. Particularly, bright white-light emission with a high photoluminescence quantum yield of 80.5% is yielded in 0.5%Sb 3+ –2%Tb 3+ –2%Sm 3+ -codoped Cs 2 NaYCl 6 SCs. Steady-state photoluminescence (PL) and time-resolved PL spectra are employed to reveal the energy transfer from Sb 3+ -induced self-trapped excitons to Ln 3+ ions. Temperature-dependent PL spectra further demonstrate that the fluorescence intensity ratio of band 657 to band 590 nm is highly dependent on the temperature, and the relative sensitivity reaches a maximum of up to 1.59% K −1 at 260 K. Moreover, the WLED based on 0.5%Sb 3+ -2%Tb 3+ -2%Sm 3+ -codoped Cs 2 NaYCl 6 SCs delivers a higher average color rendering index of 87 than 0.5%Sb 3+ -0.8%Tb 3+ -2.5%Ho 3+ -codoped Cs 2 NaYCl 6 (74.6). The outstanding white-light-emission performance together with the high temperature dependence of the fluorescence spectra confers Sb 3+ –Ln 3+ -codoped Cs 2 NaYCl 6 with huge application potential in solid-state lighting and ratiometric optical thermometry.
研究领域:
材料科学
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光学
·
固态照明
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温度传感
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yinuo Li,Jiaxin Yang,Zhimin Yu,Jing Zhang,Edwin Yue Bun Pun,Hai Lin
Traditional optical encryption technologies continue to encounter limitations in information security and transmission, presenting significant challenges for the development of advanced platforms in multidimensional encryption and complex information processing. Herein, by precisely modulating Ho 3+ doping concentrations in Cs 2 NaYCl 6 perovskite crystals (PCs), the single-ion-activated full-color dynamic responsiveness is achieved via the interplay between multiphonon relaxation and cross-relaxation (CR) processes. The introduction of Sb 3+ ions induces self-trapped states that establish an effective energy transfer pathway, enhancing photoluminescence and chromaticity discrimination. Furthermore, the PCs are embedded into polyacrylonitrile (PAN) matrix to enhance crystalline stability, improve mechanical flexibility, and expand anti-counterfeiting applications. Leveraging the dual advantages of chromatic switching from PCs and fibrillar remodeling, a layered encryption platform with dynamic information display functionality is developed. This study demonstrates programmable and stimulus-responsive optical behavior under external fields, enhancing the information carrying capacity and decoding complexity, thereby offering an innovative solution for contemporary information protection.
研究领域:
材料科学
·
光学工程
·
信息安全
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纳米技术
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xin Tong,Hongquan Yu,Xiangping Li,Sai Xu,Baojiu Chen
Owing to their environmental friendliness, structural tunability, and ability to emit self-trapped excitons, lead-free halide double perovskites (DPs) have demonstrated significant potential for applications in light-emitting diodes (LEDs) and photodetectors. However, their chemical and thermal stability is generally insufficient. These limitations hinder their practical application in LEDs, as these devices typically generate considerable heat under high operating currents and prolonged usage, particularly in the case of infrared LEDs. In this work, Er 3+ -doped double perovskites (Cs 2 NaYCl 6 and the Cs 2 NaYCl 6 @0.6 KBr composite) were synthesized via a hydrothermal method. The emission intensity of Cs 2 NaYCl 6 :2 % Er 3+ @0.6 KBr is five times greater than that of Cs 2 NaYCl 6 :2 % Er 3+ within the wavelength range of 1400–1600 nm. In the Cs 2 NaYCl 6 :Er 3+ @0.6 KBr composite, the surface defects of Cs 2 NaYCl 6 :Er 3+ were modified by the introduction of KBr, leading to an increase in the external quantum efficiency (EQE) of Cs 2 NaYCl 6 :Er 3+ from 9.5 % to 30.0 %. Under a 150 mA working current, the operating temperatures of the near-infrared (NIR) LED devices based on the Cs 2 NaYCl 6 :2 %Er 3+ and Cs 2 NaYCl 6 :2 %Er 3+ @0.6 KBr composite are 53.2 and 47.4 °C, respectively. After working for 2 h, the temperatures of the NIR LEDs based on Cs 2 NaYCl 6 :2 %Er 3+ and Cs 2 NaYCl 6 :2 %Er 3+ @0.6 KBr were 60.3 °C and 46.0 °C, respectively, under a 100 mA operating current.
研究领域:
材料科学
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光学工程
·
固态照明技术
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稀土发光材料
✓ 已验证
产品关联
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2026
·
IF 5
Yujie Chen,Fanlei Qin,Longchi Li,Jianfeng Wang,Karol Bartosiewicz,Xueliang Zhu,Gongxun Bai
Lanthanide-doped double perovskites have emerged as promising candidates for remote optical thermometry owing to their exceptional photoluminescence properties. However, pronounced luminescence quenching at elevated temperatures remain a critical bottleneck for application in high-precision temperature measurements. Herein, we report Yb 3+ /Ho 3+ -doped Cs 2 NaYCl 6 double perovskites synthesized via a solid-phase synthesis method, exhibiting thermally enhanced upconversion luminescence (UCL) and controllable color conversion. By tailoring the lanthanide doping concentration and temperature, the emission color gradually transitions from green to orange. Remarkably, this pattern remains consistent over a wide temperature range of 303–573 K, delivering a maximum relative sensitivity of 1.34% K −1 at 303 K. These features enable thermometers based on fluorescence intensity ratio (FIR) with excellent stability, high sensitivity and visualization capability. More importantly, the system simultaneously realizes thermochromic upconversion switch, opening an opportunity for multifunctional optical devices in sensing, imaging, and smart photonics.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Huabiao Tao,Yuyin Fang,Yuanpeng Zhang,Yuepin Zhang,Jianxu Hu
Optical temperature sensing based on luminescence intensity ratio shows significant potential in achieving accurate temperature detection. In this work, Sb 3+ /Mn 2+ co-doped Cs 2 NaYCl 6 double perovskites were synthesised via a hydrothermal method . Introducing Sb 3+ ions to the host significantly enhances the radiative recombination of self-trapped excitons (STEs), resulting in a broad blue emission. The co-doping of Mn 2+ ions to the composition leads to a tunable dual-emission in the spectra, originating from the energy transfer between the STEs and Mn 2+ ions. The dependence of the dual-emission on temperature is employed for optical temperature sensing. The maximum relative sensitivity, optimal thermal resolution, and optimal thermal repeatability are determined as 1.40 % K −1 , 0.002 K and 99.3% at 250 K, respectively. The results indicate that the synthesised Cs 2 NaYCl 6 : Sb 3+ /Mn 2+ double perovskites are promising candidates for high-sensitivity optical thermometers.
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
·
2025
·
IF 3.6
Pengchao Shen,Xiao Zhang,Gang Yang,Songchao Bai,Chunxiang Zhao,Xueting Wang,Changbo Zheng,Yongsheng Zhu
Lanthanide ions (Ln 3+ ) co-doped lead-free metal halide double perovskites exhibit significant potential in photoluminescence modulation, yet the luminescence synergy mechanism between co-doped Ln 3+ ions needs further exploration. In this study, we systematically investigated the electronic structure properties of the Ln 3+ single-doped (Ln 3+ = Tb 3+ , Eu 3+ , Yb 3+ , Ho 3+ , Er 3+ ) and co-doped (Tb 3+ +Eu 3+ , Yb 3+ +Ho 3+ , Yb 3+ +Er 3+ ) models based on Cs 2 NaYCl 6 double perovskites (DPs) using density functional theory (DFT). The results reveal that appropriate Ln 3+ co-doping further breaks the local symmetry compared with single doping, regulates the ionicity of Na + , and enhances the charge transfer transition of Cl − →Ln 3+ . In addition, co-doping strategies elevate exciton binding energy by approximately 25 %–38 %, promoting exciton radiative recombination. Experimental verification via hydrothermal-synthesized Ho 3+ ,Yb 3+ co-doped Cs 2 NaYCl 6 crystals confirmed a 27.4 % enhancement in absolute photoluminescence quantum yield (PLQY) under 360 nm photoexcitation compared to Ho 3+ single-doped, validating the theoretical prediction of optimized charge-transfer transitions. This study provides a theoretical reference for regulating the luminescence properties of lanthanum ion-doped double perovskite materials.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Ti Feng,Feng Tian,Huangyao Chen,Long Jie Zhang,Jun Zhang,Chaoyong Deng,Ruirui Cui
In the pursuit of environmentally friendly luminescent materials, lead-free double perovskites (LFDPs) have emerged as a promising candidate, distinguished by their unique photophysical characteristics. Concurrently, the development of a single-component phosphor capable of generating stable, full-spectrum white light presents a formidable challenge, standing in contrast to the prevalent multi-phosphor systems used in contemporary white light-emitting diodes (WLEDs). Here, we report the design and synthesis of a triple-doped Cs 2 NaYCl 6 : Sb 3+ , Tb 3+ , Mn 2+ material, achieving single-phase white light emission. In contrast to the pristine Cs 2 NaYCl 6 host, which displays only weak sky-blue luminescence, a remarkable augmentation in the intensity of its self-trapped exciton (STE) emission is observed upon Sb 3+ doping. The enhanced STE-based emission can be primarily attributed to the novel sensitizing state introduced by Sb 3+ doping. The effective STE energy transfer to Tb 3+ and Mn 3+ under Sb 3+ sensitization overcomes the inherent drawbacks of efficiency and color rendition in single-matrix WLEDs. The white light emission can be precisely tuned by simply adjusting the doping ratios. A WLED device was fabricated by integrating the as-synthesized phosphor with a 340 nm UV chip. The device exhibited promising white light performance, yielding a correlated color temperature (CCT) of 5133 K, a color rendering index (CRI) of 92.1, and CIE coordinates of (0.3422, 0.3587), thereby validating its strong potential for practical white lighting applications.
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DOI
高影响因子
Laser & Photonics Reviews
·
2026
·
IF 9.7
Wei Wang,Jiaxin Yang,Xuewei Zhao,Hai Lin
The perovskite-based multifunctional integrated light-emitting platform has garnered significant attention due to the ultralow phonon energy and flexible lattice plasticity. Achieving both high-efficiency multiband light emission and excellent thermal stability for extreme conditions remains a critical challenge in system design and performance regulation. Herein, Ho 3+ and Er 3+ co-doped Cs 2 NaYCl 6 crystals suppress multiphonon relaxation, enabling precise control of the cross-relaxation between ions, thereby achieving mutual sensitization and multicolor visible fluorescence. Simultaneously, a parallel near-infrared (NIR) channel is activated through quantum cutting, where a high-energy photon is converted into two NIR photons via successive resonant energy transfer from Ho 3+ to Er 3+ , achieving a high internal quantum yield of 147.6%. Notably, the material exhibits high thermal sensitivity and exceptional anti-thermal quenching, with a luminescence intensity of 145.0% at 433 K relative to that at 313 K, showcasing tremendous potential for high-temperature optical sensing. The dynamic multicolor luminescence and highly efficient NIR emission are successfully integrated through a dual-channel luminescence mechanism, which establishes a multidimensional platform for optical encryption and bioimaging based on multifunctional luminescent system and high thermal stability, providing an innovative strategy for developing high-security anti-counterfeiting and deep tissue imaging.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Fengmei Zhu,Yuan Gao,Chunli Zhao,Jiacheng Pi,Jianbei Qiu
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) offer numerous advantages, including compact size, tunable emission spectra, energy efficiency, and high integration potential. These features make them highly promising for various applications, such as night vision monitoring, food safety inspection, biomedical imaging, and theragnostics. All-inorganic halide double-perovskite materials, known for their large absorption cross section, excellent defect tolerance, and long carrier diffusion radius, serve as unique matrices for constructing near-infrared fluorescent materials. In this study, we successfully prepared the all-inorganic metal halide double-perovskite Cs2NaYCl6:Cr3+ using a grinding–sintering method. A small fraction of the [YCl6] octahedra within the host material’s lattice was substituted with Cr3+ ions, resulting in the creation of the Cs2NaYCl6:Cr3+ phosphor. When excited with λ = 310 nm UV light, the phosphor exhibited a broad emission range spanning from 800 to 1400 nm, covering the NIR-I and NIR-II regions. It had a broad bandwidth emission of 185 nm and achieved a fluorescence quantum yield of 20.2%. The unique broadband emission of the phosphor originates from the weak crystal field environment provided by the Cs2NaYCl6 host matrix, which enhances the luminescence properties of the Cr3+ ions. To create NIR pc-LEDs, the phosphor was encapsulated onto a commercially available UV LED chip operating at 310 nm. The potential application of these NIR pc-LEDs in night vision imaging was successfully validated.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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