INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Chunkai Wang,Ruirui Cui,Jun Zhang,Chaoyong Deng
In this study, a Ba 3 MgTa 2 O 9 : x Sm 3+ orange-red phosphor was synthesized by a high-temperature solid-phase reaction method, and its fluorescence properties were analyzed. The Ba 3 MgTa 2 O 9 : x Sm 3+ phosphor exhibited three emission peaks at 561 nm ( 4 G 5/2 → 6 H 5/2 ), 595 nm ( 4 G 5/2 → 6 H 7/2 ), and 642 nm ( 4 G 5/2 → 6 H 9/2 ) under the excitation of 407 nm. The Ba 3 MgTa 2 O 9 :0.05Sm 3+ phosphor had good thermal stability and excellent color stability at different temperatures. Ba 3 MgTa 2 O 9 :0.05Sm 3+ phosphor is the best doping concentration phosphor, with a high color purity of 98.52 %. The XRD of the Sm 3+ ion-doped phosphor showed that its crystal structure and morphology were stable, and the doping of Sm 3+ ions did not affect its crystal structure significantly. Therefore, the Sm 3+ ion-doped phosphors in this study have potential applications and are expected to be used in the field of WLED.
研究领域:
材料科学
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光学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinyu Zhang,Wanyuan Li,Chao Wang,Lin Zhang,Shuxing Li,Rong-Jun Xie
β-Sialon:Eu 2+ (Si 6-z Al z O z N 8-z :Eu 2+ , 0 < z ≤ 4.2) has been recognized as an excellent narrow-band green phosphor for wide-color-gamut backlights, but it is quite difficult to realize high quantum efficiency when further reducing the bandwidth of β-Sialon:Eu 2+ to achieve high color purity. Herein, we propose an ingenious sintering method to minimize the trade-off between color purity and luminescence intensity of β-Sialon:Eu 2+ , and finally obtain ultra-narrow band β-Sialon:Eu 2+ with an emission maximum of 527 nm, a full width at half maximum of 44.9 nm and an external quantum efficiency of 37.3 % when z is reduced to 0.03. Structural analyses indicate that β-Sialon:Eu 2+ shows higher structural ordering and rigidity with decreasing the Al-O substitution ( i.e. , z value). By combining β-Sialon:Eu 2+ (z = 0.03), a red phosphor K 2 SiF 6 :Mn 4+ with a blue InGaN LED chip, white light-emitting diodes with a luminous efficacy of 93.91 lm W −1 and a color gamut as high as 101.2 % National Television System Committee standard were demonstrated, which are superior to those in color gamut (4.3–16.8 % up) by using commercial β-Sialon:Eu 2+ .
研究领域:
材料科学
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光学工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Wenzhao Liu,Bing Liu,Yang Qiu,Jiaoyun Xia,Daoxin Wu,Zhaoyang Wu
Fabrication of photonic crystals with tunable optical properties is an important issue. Herein, we have prepared a series of hollow silica (h-SiO 2 ) with different sizes and shell thicknesses and use them to construct ternary non-close-packed photonic crystals (TNCPPCs) in liquid and gel states (air, SiO 2 , propylene carbonate/resin). Meanwhile, with the shell thickness of the h-SiO 2 from 15 nm to 40 nm, the color purity of the photonic crystal structural color can be tuned from 53% to 82%, and the transparency of the photonic crystal film can be tuned from 96% to 91%. Due to the existence of cavities and the index matching of the resin and SiO 2 , h-SiO 2 photonic crystal films have no structural color unless wetted by water. Furthermore, a patterned film is obtained using an electric field and the patterned information is invisible until wetted by water, which has achieved the process of information encryption and decryption. Overall, this work will provide new guidance for fabricating photonic crystals with tunable optical properties (structural color, color purity, and transparency) and will broaden the application of h-SiO 2 photonic crystals in sensing and information anti-counterfeiting.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Reziwanguli Yantake,Aierken Sidike,Taximaiti Yusufu
This study presents the photoluminescence characteristic analysis of a series of red phosphors of KAlSiO 4 :1.5 mol%Sm 3+ , x mol%Eu 3+ ( x = 2, 3, 4, 5, 6, 7) prepared via high-temperature solid-phase reaction. The results show that the X-ray diffraction (XRD) refinement results are reliable. The unit cell parameters and volume gradually decrease as the Eu 3+ concentration increases, resulting in a grain size reduction of 10.22%. When x = 6, the emission peaks of Sm 3+ at 564, 601, and 651 nm disappear completely, and the corresponding full width at half maximum becomes 0. At 610 nm, the emission peak intensity of Eu 3+ is increased by a factor of 4.8. The resonant non-radiative energy transfer effect is greater than the co-excitation effect. A maximum energy transfer efficiency of 97.8% is achieved. The integral area at 610 nm is as high as 85%. The color purity of the phosphor is as high as 92.97%, and the internal quantum yield gradually changes from 32% to 51%. Ultimately, these results confirm that the silicate phosphor is suitable for the red component in the three primary color phosphors of white light-emitting diodes.
研究领域:
材料科学
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光学
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DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
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IF 1.943
Xiaoyong Huang,Heng Guo,Jia Liang,Shaoying Wang
In this paper, we reported on the photoluminescence properties of novel Eu 3+ -activated KBaLu(MoO 4 ) 3 red-emitting phosphors. Under 395 and 465 nm excitations, the as-prepared samples gave bright sharp red emissions around 592, 615, 655, and 701 nm, corresponding to 5 D 0 → 7 F J (J = 1, 2, 3, and 4) transitions of Eu 3+ ions. The 615 nm red emission due to the 5 D 0 → 7 F 2 transition was dominant in the emission spectra, indicating the Eu 3+ ions occupied non-inversion centrosymmetric sites in KBaLu(MoO 4 ) 3 host lattice. Eu 3+ doping concentration dependent luminescence properties were studied, and the KBaLu(MoO 4 ) 3 :0.8Eu 3+ sample exhibited the strongest emission intensity. The CIE color coordinates and color purity of the optimal KBaLu(MoO 4 ) 3 :0.8Eu 3+ sample were determined to be (0.6655, 0.3311) and 96.7%, respectively. Besides, temperature-dependent emission spectra demonstrated that the KBaLu(MoO 4 ) 3 :0.8Eu 3+ phosphors also exhibited excellent thermal stability (I 423k /I 303k = 88%) with activation energy △E of 0.204 eV. These obtained results indicated that the newly discovered KBaLu(MoO 4 ) 3 :Eu 3+ red phosphors were promising color converters for application in white light-emitting diodes and display devices.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 6
·7285-7293
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IF 2.478
Wang Ziyao,Luan Xuezhu,Ma Guofeng,Chen Jian,Liu Yangai
A series of novel Sm 3+ activated yellow–orange-emitting phosphors have been synthesized successfully by the conventional solid-state method. Their phase composition and luminescence properties have been investigated and discussed systematically. Upon excitation at 410 nm, all the studied phosphors showed intense narrow emissions with a prominent peak centered at around 610 nm, corresponding to 4 G 5/2 — 6 H 7/2 transition. The critical concentration of Sm 3+ ions was determined to be 0.02, and the concentration quenching mechanism was verified as dipole–dipole interaction. The investigation of thermal stability revealed that the photoluminescence intensity of Ba 3 Lu 3.92 O 9 :0.08Sm 3+ at 425 K remained around 81.4% of that at 298 K. Besides, when excited at 410 nm, the studied phosphor exhibited high color purity of 99.5% with the CIE chromaticity coordinates of (0.5974, 0.4010) and a low Correlation Color Temperature of 2217 K. Consequently, it could be expected that the as-synthesized Ba 3 Lu 4 O 9 :Sm 3+ phosphors would be a promising candidate of yellow–orange component for warm white or amber LEDs.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
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IF 8.456
Jinyao Zhong,Zheng Xiao,Wenyue Liang,Yifei Wu,Qiaojue Ye,Haitao Xu,Haidong Deng,Liang Shen,Xiliang Feng,Yongbing Long
Microcavity is an efficient approach to manufacture colorful semitransparent organic solar cells (ST-OSCs) with high color purity by tailoring the transmission spectrum to narrow peaks. However, in this type of colorful semitransparent devices, high power conversion efficiency (PCE) and high peak transmittance are not yet simultaneously achieved. This paper proposes a new type of microcavity structure to achieve colorful ST-OSCs with both high PCE and high peak transmittance, in which a hybrid Au/Ag electrode is used as a mirror and WO3 is used as a spacer layer. First, it is demonstrated that the hybrid Au/Ag electrode mirror brings about an improvement of 7.7 and 5.5% for PCE and peak transmittance, respectively, when compared with those of the reference devices using the Ag electrode mirror. Specifically, the PCE of the optimized devices reaches the satisfactory value of over 9%, and the peak transmittance is over 25%. This value of PCE is the highest one reported so far for the microcavity-based ST-OSCs with the same peak transmittance. Second, it is demonstrated that the second-order resonance of the microcavity can be used to improve the color purity of green ST-OSCs by narrowing the transmission peak, and the combination of the second-order and third-order resonance can be used to construct colorful ST-OSCs with mixed colors. Thus, a novel approach is developed to tune the color of ST-OSCs, which is based on high-order resonance modes of the microcavity.
研究领域:
材料科学
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光学工程
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Xiao Zhang,Qin Yang,Yunhe Lang,Xia Jiang,Peng Wu
Horseradish peroxidase (HRP)-based assays feature particular interests because of the simple colorimetric readout. In these assays, 3,3′,5,5′-tetramethylbenzidine (TMB) is the most widely used chromogenic substrates for HRP. The later research in nanozyme and DNAzyme also used TMB (the chosen substrate) because they are both HRP-mimics. It should be noted that the substrate of HRP is not just limited to TMB but, in fact, a broad range of benzidine derivatives. However, except decreased carcinogenicity due to tetrasubstitution of benzidine, the rationale for the chosen substrate TMB is not clear yet. Here, we addressed such a fundamental issue from the chemistry point of view. Nine benzidine derivatives featuring varied properties (different substitution groups and varied number of substitutions) were selected and investigated with four typical TMB-involved chromogenic systems. Among the existing benzidine substrates that are used for peroxidase-based assays, TMB exhibited the highest sensitivity, better color purity of colored products, and reasonable stability of oxidation products. Moreover, two tetrasubstituted benzidine derivatives other than TMB (4OCH3 and 2OCH32CH3) were synthesized for comparison. It turned out that the performances (sensitivity, color purity, and stability of the colored products) of TMB are still superior, thus chemically confirming its status of “the chosen substrate” in colorimetric assays.
研究领域:
分析化学
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生物化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Qi Wu,Mengmeng Fu,Chenzhang Gu,Yinzhen Wang,Lu Yao,Cailin Wang
Red phosphors with good thermal stability, high color temperature and color purity are critical in high power warm white LED devices. Herein, a series of single and co-doped Tb 3+ ,Eu 3+ polychromatic phosphors with pyrochlore structure based on Gd 2 Zr 2 O 7 have been prepared for the first time by a conventional solid phase reaction method. Compared to single doped Eu 3+ phosphors, Tb 3+ ,Eu 3+ co-doped phosphors possess following advantages: improved UV absorption, increased photoluminescence intensity, extended luminescence range and improved thermal stability. At room temperature, the Gd 2 Zr 2 O 7 :Tb 3+ ,Eu 3+ phosphors exhibited a gradual shift from yellow-green emission at 544 nm to orange-red emission at 613 nm with increasing doping of Eu 3+ ions. Energy transfer efficiency has been evaluated to be 71% by analyzing the fluorescence lifetime of Tb 3+ ions. The concentration quenching mechanism under different conditions was analyzed in detail and it was concluded that the quenching of Tb 3+ is caused by dipole-dipole interaction. In addition, the activation energy (ΔE a ) of the Gd 1.92 Zr 2 O 7 :0.03Tb 3+ ,0.05Eu 3+ phosphor was calculated to be as high as 0.2674 eV compared to other Tb 3+ , Eu 3+ co-doped phosphors, demonstrating its high thermal stability. WLEDs devices based on Gd 1.92 Zr 2 O 7 :0.03Tb 3+ ,0.05Eu 3+ phosphors have been prepared, which have low correlated color temperature (CCT) (5283 K), high color rendering index Ra = 85.5 K) and CIE coordinates chromaticity coordinate (0.3371,0.3333). All of the results show that Gd 2 Zr 2 O 7 :Tb 3+ ,Eu 3+ phosphors provide a new avenue to develop high quality red emission and high thermal stability phosphors for WLEDs.
研究领域:
材料科学
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光电
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光子学
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固体物理
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 25
·e202104463
·
IF 5.02
Yue Liu,Yuxiang Wang,Haoran Cheng,Zheng Ma,Qian Li,Gang Wang,Daocheng Pan,Limin Wang,Jun Ming
Graphical A new soluble CsPbX 3 precursor to in-situ prepare luminescent CsPbX 3 nanocrystal film in the air readily was designed. The composition of the CsPbX 3 NCs films can be tuned by changing the solution precursors, allowing obtaining a high color purity and a narrow emission width. Inorganic cesium lead halide perovskite nanocrystals are candidates for lighting and display materials due to their outstanding optoelectronic properties. However, the dissolution issue of perovskite nanocrystals in polar solvents remains a challenge for practical applications. Herein, we present a newly designed one-step spin-coating strategy to prepare a novel multicolor-tunable CsPbX 3 (X=Cl, Br, I) nanocrystal film, where the CsPbX 3 precursor solution was formed by dissolving PbO, Cs 2 CO 3 , and CH 3 NH 3 X into the ionic liquid n-butylammonium butyrate. The as-designed CsPbX 3 nanocrystal films show high color purity with a narrow emission width. Also, the blue CsPb(Cl/Br) 3 film demonstrates an absolute photoluminescence quantum yields (PLQY) of 15.6 %, which is higher than 11.7 % of green CsPbBr 3 and 8.3 % of red CsPb(Br/I) 3 film. This study develops an effective approach to preparing CsPbX 3 nanocrystal thin films, opening a new avenue to design perovskite nanocrystals-based devices for lighting and display applications.
研究领域:
材料科学
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纳米技术
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光电
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
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IF 2.7
Feiyan Xie,Junqiang Gu,Dekang Xu,Qiancheng Xiong,Jinyu Yang,Xiangjian Ou,Dawei Wen
Research into red phosphors with a high color rendering index is particularly compelling, given the absence of a red component in the spectrum of commercial pc-WLEDs, which combine blue LED chips with yellow-emitting YAG:Ce3+ phosphors. Herein, we reported a novel Eu3+ activated Ca3Zn3Te2O12 red-emitting phosphor, synthesized using a conventional high-temperature solid-phase method. The phase and crystal structures were analyzed by powder X-ray diffraction and Rietveld refinement. The optimal excitation peak of the Ca3Zn3Te2O12:Eu3+ phosphor was located at 395 nm, matching those of conventional commercial near-ultraviolet chips. In addition, the Ca3Zn3Te2O12:9%Eu3+ phosphor exhibited good thermal stability, with an activation energy of 0.267 eV, and the CIE color coordinates hardly changed with temperature. Ultimatel, a high-quality white LED device was fabricated by combining Ca3Zn3Te2O12:9%Eu3+ red phosphor, a commercial BaMgAl10O17:Eu2+ blue phosphor, and(Ba,Sr)2SiO4:Eu2+ green phosphor with a 395 nm near-UV chip. Despite a substantial increase in the input current from 20 to 320 mA, the white-LED maintained a stable color rendering index of around 80, highlighting its consistent performance. These results indicated that Eu3+ activated Ca3Zn3Te2O12 phosphors are promising red emission candidates for white LEDs pumped by near ultraviolet chips.
研究领域:
材料科学
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光电技术
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光子学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qun Wan,Lu Huang,Long Kong,Qinggang Zhang,Congyang Zhang,Mingming Liu,Xinrong Liao,Wenji Zhan,Weilin Zheng,Changwei Yuan,Mengda He,Liang Li
Artificial intelligence offers new opportunities for translucent displays. However, achieving translucent light-emitting diodes (LEDs) with high efficiency and high color purity remains a challenge. Here, we propose a strategy of using an alkali metal/inert metal (calcium/silver) bilayer metal electrode as a top electrode and perovskite nanocrystals as an emitter layer in the device structure, which allows us to not only fabricate excellent opaque LEDs but also manufacture highly efficient semitransparent LEDs with high color purity, total brightness (over 7000 cd m–2), total external quantum efficiency (over 12%), and 56% transmittance around 520 nm. This is the highest external quantum efficiency report about semitransparent LED based on perovskite materials or inorganic quantum dots so far, which presents great application potential in the field of translucent display with high color purity and wide color gamut.
研究领域:
材料科学
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光电技术
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纳米技术
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显示技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）