JOURNAL OF LUMINESCENCE
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2024
·
IF 3.3
Hong Li,Li Li,Lingsong Mei,Wei Zhao,Xianju Zhou,Huajing Gao,Xiaobing Luo,Yongbin Hua
Due to the huge food demand of the population, the luminescent materials with excellent performance applied for indoor plant cultivation have been extensively studied. In this work, a series of Mn 4+ -doped LaBaZnTaO 6 phosphors in were synthesized and its luminescence mechanism has been researched in detail. Due to their broad absorption band, they could be effectively excited by the NUV to blue LED chip. Importantly, suitable emission in the red region overlapped with the absorption of plant pigments making it possible to be used in indoor plant cultivation. On the other hand, high-sensitivity non-contact optical temperature sensor is the focus of current research, so the optical thermometer-based lifetime model also was designed and investigated in this work. Interestingly, the maximum relative sensitivity was 1.38 %K −1 @473 K, suggesting a good development potential of the sample in optical thermometry. Finally, the warm WLED device was fabricated and achieved a superior CRI value of 90.95 and a good CCT of 3582 K. All the obtained results suggest that it could become a promising red component to be applied in optical thermometer and lighting sources.
研究领域:
材料科学
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植物学
·
光学工程
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Zhenxing Fang,Kuang Wu,Le Wang,Da Xu,Weiwei Wang,Yuhang Lin,Xiaohui Liu,Chun Sun
Mn doped two-dimensional (2D) layered perovskites , are becoming excellent candidates as red phosphor because of their high quantum yields (QY) and enhanced stability. However, these Mn doped 2D layered perovskites can only be excited by the near UV light , which largely limits the development of perovskites. Herein, blue-excitable Mn-doped PEA 2 (Pb/Mn)(Br/I) 4 PQDs are synthesized from anion exchange surface engineering strategy. After anion exchange, orange Mn 2+ emission from exciton-to-Mn energy transfer is acquired under the excitation of 450 nm. The PEA 2 (Pb/Mn)(Br/I) 4 compounds exhibit strong luminescence with photoluminescence (PL) QY of 52%, which is comparable to most of the reported red emitting phosphors. A prototype white light-emitting diode (WLED) with good optical performance was fabricated using commercial (Sr,Ba) 2 SiO 4 :Eu phosphor and as-prepared PEA 2 (Pb/Mn)(Br/I) 4 as green and orange color converters, showing great potential in the applications of solid state lighting.
研究领域:
材料科学
·
光电
·
固态照明
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yanzhi Zhang,Rongmao Li,Xingyang Peng,Xiang Guo,Chaoyong Deng,Ruirui Cui
In this study, a novel orange-red Sr 2 ScGaO 5 : x Eu 2+ phosphor was designed and produced adopting a high-temperature solid-phase technique, and its properties were optimized using a cation substitution strategy of Sr/Ca substitution and Yb 3+ co-doping. Experiments revealed that Eu 2+ doping causes the material to emit orange-red light at 606 nm, with a quantum efficiency of 67.51 %. Replacing Sr 2+ with Ca 2+ further red-shifted the emission peak to 646 nm, broadening the red-light region. Through co-doping with Eu 2+ and Yb 3+ , the thermal stability of the phosphor is significantly improved, with the light emission intensity retention rate at 423 K increasing from 59.84 % to 88.31 %, providing a new approach to enhancing the thermal stability of Eu 2+ -doped phosphors. The WLED devices prepared using Sr 2 ScGaO 5 :0.04Eu 2+ , 1.4Ca 2+ achieved a CRI of 88.1, with a CCT of 3715 K. The WLED device produced using Sr 2 ScGaO 5 :0.04Eu 2+ , 0.03Yb 3+ exhibited a CRI of 90.4 and a CCT of 4076 K. Both performances significantly outperform commercial WLED, effectively addressing the deficiency of insufficient red light in commercial WLED. This phosphor has also been successfully applied in fingerprint recognition, highlighting its potential for multi-domain applications.
研究领域:
材料科学
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光电子学
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发光材料
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固态化学
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发光二极管（LED）
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传感器
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Fang Fang,Yuanhao Chen,Boyan Liu,Xiaoshan Zhang,Benchun Li,Dawei Zhang,Dechao Yu
Red-emitting phosphors efficiently excited by near-ultraviolet (NUV) light are desired for high-quality phosphor-converted white LED (pc-WLED) devices. In this work, Eu 3+ /Tb 3+ codoped NaBiF 4 phosphors were designed as promising NUV-excitable candidates for the red component in pc-WLEDs. Under 379 and 395 nm excitation, the NaBiF 4 :Eu 3+ ,Tb 3+ samples yield intense red emissions, predominantly at 616 nm due to the 5 D 0 → 7 F 2 transition of the Eu 3+ ion. The Tb 3+ dopants bring in synergistic effects in greatly enhancing the Eu 3+ red luminescence, i.e. resonant energy transfer (ET) from Tb 3+ to Eu 3+ and crystal field perturbation surrounding Eu 3+ . The relevant spectroscopic properties were systematically studied using steady-state and time-resolved fluorescence spectroscopy. The optimized NaBiF 4 :20%Eu 3+ ,15%Tb 3+ sample features a nearly complete Tb 3+ → Eu 3+ ET, leading to a pure Eu 3+ red luminescence, and showing quantum yield values of 44.2% and 51.6% upon 379 and 395 nm excitation, respectively. Notably, the red luminescence from the NaBiF 4 :20%Eu 3+ ,15%Tb 3+ system has a high thermal stability, which at 398 K sustains 80.2% of its room-temperature luminescence intensity under 395 nm excitation. Via coating a mixture of commercial BaMgAl 10 O 17 :Eu 2+ blue- and (Ba,Sr) 2 SiO 4 :Eu 2+ green-emitting phosphors and the optimized phosphor on NUV ∼ 380 and 395 nm LED chips, the homemade 395 nm-excited pc-WLED exhibited interesting warm lighting performance, i.e. color rendering index (Ra) ∼ 90 and correlated color temperature (Tc) ∼ 3884 K, while the 380 nm-excited pc-WLED had Ra ∼88 and Tc ∼ 4685 K. That is, the NUV ∼395 nm chip (illumination also overlapping with the Tb 3+ absorption around 380 nm) is practically preferable to excite the Tb 3+ /Eu 3+ pc-LED for high-qualified warm white lighting. All the results unveil the viable schemes to develop the Eu 3+ /Tb 3+ co-activated red-emitting phosphors, offering promising prospects for novel NUV-excitable pc-WLED light sources.
研究领域:
材料科学
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光学材料
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光子学
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固态照明
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发光光谱学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Qiang Zhang,Xicheng Wang,Yuhua Wang
Due to the complicated production process and reabsorption problem, the development and application for white light-emitting diodes (WLEDs) are affected. A combination of cyan and red phosphors with near-ultraviolet (n-UV) LED chip has been proposed to solve these problems. Its key is developing cyan phosphor with broad emission band and excellent performances. In this work, we have developed a broadband cyan-emitting phosphor RbBa 2 (PO 3 ) 5 : Eu 2+ (RBP: Eu 2+ ) by a solid-state method. The phase purity, crystal structure, luminescence properties and their relationship were investigated systematically. The RBP: Eu 2+ phosphor can yield asymmetric broadband cyan emission upon 350 nm light excitation , which is ascribed to the occupation of Eu 2+ for both the Ba1 and Ba2 sites. The measurement of temperature-dependent luminescence implies that the phosphor remains 89.5% of the initial value at 150 °C, which is much better than the commercial Ba 2 SiO 4 : Eu 2+ phosphor. Furthermore, a WLED device has been obtained by composing the RBP: 0.01Eu 2+ and CaAlSiN 3 : Eu 2+ phosphors with a 365 nm LED chip. The emitted white light can show fabulous performances with the color coordinates of (0.3792, 0.3359), correlated color temperature of 3841 K and CRI of 90.8. The results suggest the RBP: Eu 2+ phosphor to be a promising candidate for high-power WLEDs.
研究领域:
材料科学
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发光材料
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半导体照明
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无机化学
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光电子学
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DOI
高影响因子
JAPANESE JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 61
·期 6
·062002
·
IF 1.491
Lei Wang,Subiyinuer Jilili,Ayinuremu Tuerxun,Aierken Sidike,Qingling Wang
A series of Tb3+, Eu3+, Li+ co-doped SrSiO3 phosphors were prepared using the high-temperature solid-phase method. The X-ray diffraction results showed that Tb3+ and Eu3+ successfully entered into the SrSiO3 matrix lattice. Strong energy transfer from Tb3+ to Eu3+ is exhibited with a calculated energy transfer efficiency of 94.7%. Doping of the charge compensator Li+ increased the luminescence intensity of the SrSiO3:6%Tb3+, 6%Eu3+, 3%Li+ phosphor at a wavelength of 614 nm by 4.2 times and significantly improved the color purity of this phosphor (Cp = 85.9%). Based on color coordinate analysis, the phosphor color coordinates are located near (0.615, 0.365), which belongs to the red region. The phosphor was integrated into a white LED. The resultant package exhibited a color temperature of 6479 K and a color rendering index of 93.8. Its luminous performance was also very stable under different drive currents.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2025
·
IF 6.4
Lanxuan Yang,Lili Liu,Xu Ding,Ruili Xu,Tian Tian,Zhifu Liu,Lianjiang Tan,Yaoqing Chu
The asymmetry of the local environment within host materials plays a critical role in enhancing the emission performance of Eu3+ ions. In this study, we introduced a novel Si4+-doping strategy to optimize the luminous properties of Eu3+ ions by promoting asymmetry in the local lattice environment. And then, a series of Si4+/Eu3+ co-doped Sr3Ga2Ge4O14 phosphors were synthesized. Our findings reveal that Si4+-doping at a concentration of 60 mol% significantly enhances the emission intensity of Eu3+ ions in the Sr3Ga2Ge4O14 host by approximately 80%. Also, the internal quantum efficiency increases from 37.80% to 49.04%, alongside a rise in color purity from 87.40% to 99.80%. Utilizing this Sr2.3Ga2Ge1.6Si2.4O14:0.7Eu3+ high-performance red phosphor, we fabricated a white light-emitting diode (WLED) device with natural white light characteristics, achieving CIE coordinates of (0.338, 0.323), a correlated color temperature (CCT) of 5636 K, and a color rendering index (CRI) of Ra = 89.4. Additionally, we developed a high-performance anti-counterfeiting ink using this red phosphor, which adheres uniformly to surfaces with varying roughness and delivers exceptional luminescence effects. This study provides new insights into the development of advanced red-emitting phosphors for applications in lighting and anti-counterfeiting technologies.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2024
·
IF 3.2
Zhichao Jin,Zhongli Zhu
A series of SiO 2 -B 2 O 3 -ZnO-La 2 O 3 -BaO (SBZLBa) glasses doped with Dy 3+ and Eu 3+ were synthesized using the melt-quenching technique. Their optical characteristics and potential applications in W-LED devices were investigated. The structural effects resulting from doping the glass with Dy 3+ and Eu 3+ ions were elucidated through infrared spectroscopy and an examination of the physical properties. The variations in emission intensity within the fluorescence spectrum validated the sensitizing effect of Dy 3+ on Eu 3+ within the glass matrix. By manipulating the transitions of both Dy 3+ and Eu 3+ , the excitation wavelength was altered, enabling the realization of cool white, neutral white, and warm white luminescence, thus accommodating the diverse requirements for white light emission in lighting applications. After incorporating 1.0 mol% of Dy 2 O 3 and 0.8 mol% of Eu 2 O 3 , respectively, the glass exhibited CIE coordinates of (0.3332, 0.3535), positioning it within the white light spectrum and in close proximity to the ideal white light coordinates of (0.33, 0.33). The SBZLBa-Dy 2 O 3 –0.8Eu 2 O 3 glass exhibited a quantum yield of 5.98 %. It has been demonstrated through acid and alkali resistance tests that this glass possesses excellent chemical stability. Additionally, temperature-dependent emission spectra have revealed that the luminous intensity of the glass maintains over 85 % of its room temperature value at 185 °C, with Eα determined to be 0.2387 eV.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 39
·10241-10250
·
IF 5.256
Mengmeng Zhu,Yuexiao Pan,Luqing Xi,Hongzhou Lian,Jun Lin
Mn4+-activated red phosphors have attracted considerable attention as promising red components in the spectra of white light emitting diodes (WLEDs) to achieve warm white light with superior performance. Herein, a novel red phosphor based on Mn4+-doped dodec-fluoride Li3Na3Al2F12:Mn4+ (LNAF:Mn) with microcubic morphology was obtained at room temperature. To elucidate the underlying relationship between the crystal structure and photoluminescence of LNAF:Mn, a phosphor LiNa2AlF6:Mn4+ with similar composition has been prepared, and their morphology and optical properties were comparatively investigated. The emission of the red phosphor LNAF:Mn is blue shifted compared to LiNa2AlF6:Mn4+ suggesting that the chromaticity coordinates of LANF:Mn are closer to the ideal red point (0.67, 0.33). The luminescence properties of LNAF:Mn have been improved by optimizing the synthetic conditions. This work exhibits a strategy to explore a novel Mn4+-doped fluoride except for the identified hexa-fluorides. Employing the as-prepared red LNAF:Mn as a red component, a high-performance WLED with a correlated color temperature (CCT) of 3874 K and a color rendering index (CRI) of 90.6 was obtained. This suggests the phosphor is a potential commercial red phosphor in warm WLEDs.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
AICHE JOURNAL
·
2015
·Vol. 62
·期 2
·580-588
·
IF 2.748
Zhixing Zhao,Xiao-Qiao Wang,Luting Ling,Cai-Feng Wang,Su Chen
The bottleneck of large-scale production of semiconductor quantum dots (QDs) is how to solve heavy metal ions waste water and the rapid separation during industrial process. A facile strategy for fabricating CdTe@Ca(OH) 2 nanocrystals exhibiting both improved photoluminescence (PL) stability and prolonged PL lifetime via an economical coprecipitating technology is reported herein. The procedure on capping CdTe QDs into Ca(OH) 2 crystals can enable the products to be easily filtrating separation and the content of residual Cd 2+ filtrate solution to be reached to 0.238 ppm level. Also, fluorescent rod-like heterocrystals by addition of saturated CaCl 2 solution is constructed. CdTe@Ca(OH) 2 nanocrystals is utilized further as phosphor powders to construct white light emitting diode (WLED). The WLED presented, here, has good photoelectric properties with color rendering index of 82.4 at 350 mA, a color temperature of 4643 k, and Commission Internationale de L'Eclairage coordinate of (0.3548, 0.3532), belonging to the white gamut, showing great potential in industrial application. © 2015 American Institute of Chemical Engineers AIChE J , 62: 580–588, 2016
研究领域:
材料科学
·
化学工程
·
光学工程
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 46
·17281-17289
·
IF 4.39
Dayu Huang,Yue Liu,Qiuyun Ouyang,Hongzhou Lian,Jun Lin
The stability of perovskite quantum dots (PQDs) plays a vital role in practical devices. Besides silica coating, embedding PQDs in zeolites is another strategy to improve their stability significantly. Although the zeolite rigid framework has been reported to protect PQDs, there are few reports on the in situ synthesis of PQDs in zeolites. In this work, cubic phase CsPbX3 (X = Br, I) nanocrystals were successfully prepared by the ion exchange method combined with a non-polar organic trigger. Dropping a certain amount of ZnM2 (M = Br, I) solution into the intermediate product Cs4PbCl6 nanocrystals resulted in the formation of the final CsPbX3 nanocrystals. The ZnM2 solutions were prepared in non-polar solvents (hexane, octane, or chloroform). The highest photoluminescence quantum yield (PLQY) of the synthesized CsPbX3@zeolite composites can reach 83%, with a lifetime of 1.37 μs. The stability of the CsPbX3@zeolite composites thin film against damage from air and light is significantly improved. We fabricated white light-emitting diodes (WLEDs) using CsPbBr3@zeolite as the green light source and CsPbI3@zeolite as the red light source to further emphasize the practical application effect of the CsPbX3@zeolite composites. This work not only provides a new method for the synthesis of CsPbX3 nanocrystals but also involves the in situ synthesis of high stability CsPbX3@zeolite composites within the zeolite.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Naixin Li,Fang Lei,Xiaoxiao Ji,Luqiao Yin,Ying Shi
While there has been extensive investigation of synthesizing perovskite nanocrystals (NCs) in light emitting diode (LED) with high photoluminescence performance and stability, they are still limited by chemical and phase instabilities. Moreover, the protonation occurring between oleic acid (OA) and oleyl amine (OAm), which are common capping ligands to passivate the NCs , promotes the degradation of photoluminescence properties. To overcome these issues, we report a post synthesis passivation strategy for self-assemble CsPbBrI 2 1D nanobelt by using bidentate ligand, namely homophthalic acid. The introduced homophthalic acid can passivate the CsPbBrI 2 surface defects by reducing exposing Pb 2+ to prevent nonradiative recombination. Benefiting from homophthalic acid, the passivated NCs exhibit narrow red photoluminescence at 640 nm with 74 % quantum yield (QY) and remain phase stable after 4 months. The external quantum efficiency (EQE) of the white light emitting diode (WLED) fabricated with QDs passivated with homophthalic acid is 1.99 %, its CIE chromaticity coordinate is (0.31,0.33) and the power efficiency is 2.13 lm/W.
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
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