CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Sai Lin,Mengyuan Chen,Ziwei Wang,Yijun Zhang,Rongrong Yuan,Xiaojuan Liang,Weidong Xiang,Yongqiang Zhou
Multicolor luminescent carbon dots (Cdots) are of immense importance nowadays, while it still a challenge to construction of full-color light-emitting Cdots and their efficient solid-state materials. Here in, we fabricated a facile method to synthesize multicolor Cdots by adjustment of the reaction temperature. Although all samples showed uniform distribution of particles size and similar graphite structure, the surface chemical composition gradually varied among Cdots, especially the oxygen contents and nitrogen contents. Detailed material characterization has revealed that this tunable emission is results from the changes of the chemical composition. It is believed that the surface oxidation become more severe at high temperature, resulting in the formation of higher oxygen and nitrogen, which are responsible for the long-wavelength emission. Meanwhile, flexible solid-state materials were successfully created by combination of organosilane (OSi) and Cdots, which can be used to prevent the aggregation-induced solid-state fluorescence quenching. Finally, red Cdots/OSi was stacked on the Y 3 Al 5 O 12 :Ce 3+ (Ce 3+ : YAG) phosphor-in-glass (Ce-PiG) via tape-casting technology. Then, warm white light-emitting diodes (WLEDs) were constructed by these materials and GaN chips. As the Cdots increases, the correlated color temperature (CCT) decreases while the color rendering index (CRI) increases, and the color coordinates shift towards the red region. The resulting color converting material produced a warm white by adjusting red Cdots content, which will be a promising candidate for applications in the warm WLED.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
照明工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 24
·40846-40852
·
IF 5.2
Xinrong Chen,Shaoda Yuan,Yanghan Guo,Bingguo Liu,Shiqing Pang,Le Zhang,Baoli Du,Carsten Dam-Hansen,Jian Xu,Ole B. Jensen
Eu 2+ doped-CaAlSiN 3 possesses broad red emission, enabling a phosphor-converted lighting device to achieve a high color rendering index (CRI) and proper color temperature. However, CaAlSiN 3 :Eu 2+ exhibits relatively slow decay (∼1 μs) and intense re-absorption of luminescence from green/yellow emitters, thereby causing optical saturation and reducing the luminous efficacy. Here, we fabricated a novel phosphor converter comprising Lu 3 Al 5 O 12 :Ce 3+ and Y 1.3 Gd 1.6 Al 5 O 12 :Ce 3+ powders. The typical sample, when excited by a blue laser , exhibited a high luminous efficacy of 231 lm/W and a high saturation threshold of 22.2 W/mm 2 , resulting in a high luminous exitance of 695 lm/mm 2 . Importantly, the phosphor converter produced a broad emission band that included sufficient cyan and red components, resulting in a full width at half maximum (FWHM) of 134 nm and a high CRI of 81. With this excellent balance between CRI and luminous efficacy, the reported phosphor converter can significantly expand the range of laser lighting applications.
研究领域:
光学材料
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固态照明
·
光子学
·
发光
·
材料科学
✓ 已验证
DOI
高影响因子
OPTICS EXPRESS
·
2023
·Vol. 31
·期 15
·24914-24925
·
IF 3.8
Zitong Liu,Le Zhang,Le Zhang,Le Zhang,Le Zhang,Jian Kang,Jian Kang,Tianyuan Zhou,Tianyuan Zhou,Shiwei Chen,Shiwei Chen,Peng Yang,Bingheng Sun,Yang Li,Hao Chen,Hao Chen,Hao Chen
Ceramic phosphors are widely considered the next-generation phosphor material for white LED/LD lighting, and a wide spectrum is a key factor in improving the CRI of lighting sources. In this paper, a novel, to our knowledge, barcode-structured YAG:Ce/YAG:Ce,Mn ceramic phosphor was designed and fabricated. The lighting sources with the CRI value of 73.5 and 68.9 were obtained under the excitation of blue LEDs and blue LDs, respectively. Simultaneously, thanks to the effective supplementary emission from a red LD, the CRI of the ceramic-based lighting source reached 81.8 under blue LD excitation. Specifically, the microstructure and luminescent property of ceramic phosphors with different thicknesses and ion doping concentrations were systematically studied. Besides, by changing the blue power from 0.52 W to 2.60 W, the CCT of the laser lighting source with the encapsulation of optimized YAG:Ce/YAG:Ce,Mn ceramic phosphors ranged from 3928 K to 5895 K, while the CRI always maintained above 80. The above results indicate that barcode-structured Ce:YAG/Ce,MnYAG ceramic phosphor is a candidate to achieve a high CRI and ican be applied to various lighting occasions.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2026
·
IF 11.8
Shengze Ban,Yueqi Shen,Jianyi Huang,Yuxiang Xu,Wanxin Chen,Yu Tong,Weihua Ning
0D metal halides are promising light emitters owing to strong quantum confinement and efficient self-trapped exciton (STE) emission, yet achieving both broadband tunability and near-unity PLQY in lead-free systems remains challenging. This study reports the synthesis and comprehensive characterization of Sb 3+ -doped 0D perovskite single crystals, (BYA) 4 InCl 7 : xSb 3+ . Structural analysis confirms the successful substitution of Sb 3+ into the isolated [InCl 6 ] 3− octahedra, which are spatially separated by bulky BYA + organic cations, thereby preserving the intrinsic 0D framework. Sb 3+ incorporation induces a substantial bandgap narrowing from 4.08 to 2.85 eV, accompanied by a pronounced enhancement of broadband STE emission. At an optimal doping level (x = 4.87%), the material achieves an ultrahigh PLQY of 97.53%. Temperature-dependent photoluminescence measurements, together with density functional theory calculations, reveal that the exceptional emission efficiency arises from strong electron phonon coupling and a low activation energy for thermal quenching. Furthermore, a prototype white light-emitting diode fabricated using the (BYA) 4 InCl 7 : Sb 3+ phosphor exhibits excellent color rendition (CRI = 89.3) and robust operational stability. This study elucidates the structure property interplay governing Sb 3+ -doped 0D indium halides and highlights their promise as high-performance emitters for advanced optoelectronic devices.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Yueyue Wu,Lan Liu,Zifan Li,Jiayi Xie,Zixin Wang,Guo Fang,Keyan Li,Zhenhui Tao,Xin Li,Fei Xiu,Juqing Liu
Graphical With the synergy of Mn 2+ and ODA codecoration, CDs with ultrabroadband and efficient yellow fluorescence in the solid state were synthesized through a simple one-step solvothermal process. These synthetic phosphors exhibit a production yield of 80%, an FWHM of 98 nm, and a solid-state quantum yield up to 62.8%, allowing for high-CRI white LEDs in green and health lighting. Exploiting environment-friendly and efficient phosphors is crucial to constructing high-quality and sustainable white light-emitting devices. Here, we demonstrate a facile and high-yield approach to synthesize Mn 2+ /octadecylamine (ODA)-codecorated carbon dots (CDs) with ultrabroadband and efficient yellow fluorescence in the solid state. The dots are prepared from anhydrous citric acid (CA), 1-ODA, and manganese acetate through a simple one-step hydrothermal process, with a production yield of 80%, a full width at half maxima (FWHM) of 98 nm, and a solid-state quantum yield up to 62.8%. Utilizing the synthetic CDs powder as a phosphor to directly coat on a blue light-emitting chip, the device exhibits warm white emission, with a high color rendering index (CRI) of 88, correlated color temperature (CCT) of 4215 K, and Commission International de l'Éclairage (CIE) coordinates of (0.33, 0.31), endowing great potential applications in green and health lighting.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 2
·e70588
·
IF 4.2
Xingbo Kang,Fan Li,Zhiyuan Pan,Qi Zhu,Ji-Guang Li
Without using any organic additive, zircon-type (space group I 4 1 / amd ) (Lu 1− x Sc x ) 0.99 VO 4 :0.01Bi 3+ ( x = 0−1, 0.1 interval) nano/microcrystals were successfully synthesized via a hydrothermal reaction at 180°C for 24 h. The products were systematically characterized via XRD, FE-SEM, TEM, elemental mapping, and optical spectroscopy to investigate the effects of Sc 3+ doping on crystal structure, morphology, and luminescent properties. It was found that with the substitution of Lu 3+ by Sc 3+ , the products gradually transformed from LuVO 4 :Bi 3+ nanocrystals into highly anisotropic ScVO 4 :Bi 3+ microrods preferentially growing up along the [001] direction. The peak wavelength of both excitation and emission almost linearly increased with decreasing cell volume, accompanied by band broadening, which was rationalized by considering crystal field splitting energy ( D q), character of the chemical bond (nephelauxetic effect) and metal to metal charge transfer (MMCT) energy. This finely tunable broadband emission (center wavelength 581−639 nm, FWHM >175 nm) enables the materials to supplement multicolor components, presenting potential for application in phosphor-converted white light-emitting diode (pc-WLED) and others.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 10
·3522-3530
·
IF 7.393
Zehua Liu,Pan Hu,Hangjie Jiang,Peng Sun,Yongfu Liu,Zhaohua Luo,Jingtao Xu,Zhengren Huang,Jun Jiang
Laser diode (LD) driven lighting is expected to be the next-generation lighting, and red CaAlSiN3:Eu2+ (CASN) phosphor is still required for high-quality LD white lighting. Utilizing glass with a suitable thermal expansion coefficient and low softening temperature as the inorganic binder, CASN phosphor-in-glass-films (PiFs) are fabricated in this work. High efficiency and thermal stability are achieved by optimizing the reaction of CASN and glass. Introducing Lu3Al5O12:Ce (LuAG) to offset the luminous spectra of CASN PiFs, broad emission spectra and high efficiency are recorded. High color rendering index (CRI, 88.6), luminous efficiency (LE, 153 lm W−1), and luminous flux (LF, 1162 lm) are achieved simultaneously when the PiFs are excited by a 455 nm blue LD. At last, the high color quality LD white lighting produced by PiFs is displayed for the first time. We believe that the results provided by this work are an enormous progress for PiFs and encourage more researchers to provide new strategies to acquire high performance of PiFs in white LD lighting.
研究领域:
光学材料
·
固态照明
·
光子学
·
材料科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 21
·9740-9746
·
IF 7.79
Dongdong Yan,Qionghua Mo,Shuangyi Zhao,Wensi Cai,Zhigang Zang
With a high photoluminescence quantum yield (PLQY) being able to exceed 90% for those prepared by the hot injection method, CsPbBr3 quantum dots (QDs) have attracted intensive attention for white light-emitting diodes (WLEDs). However, the whole process is carried out in a 3-neck flask via air isolation and at a relatively high temperature. In addition, CsPbBr3 QDs suffer from poor stability under ambient atmosphere. In this work, an effective strategy through doping of Sn2+ ions at room-temperature is proposed to improve the emission efficiency and stability of CsPbBr3 QDs. Compared with pure CsPbBr3 QDs, a higher PLQY and a better stability are obtained. The detailed physical mechanism for this performance enhancement is discussed and described. An optimum result is found at an Sn2+ doping amount of 20%, which shows a high PLQY of 82.77%. WLEDs based on these 20% Sn2+ doped CsPbBr3 QDs are also studied, exhibiting a high color rendering index of 89 and a correlated color temperature (CCT) of 3954. The method proposed here provides an effective strategy to enhance the fluorescence and stability of CsPbBr3 QDs, which might have promising potential in the lighting fields.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yuan Wang,Zhikai Liang,Kezhou Jiang,Yifang Lin,Daomiao He,Jinhui Liu,Weixian Wang,Jingfei Wang,Bin Deng,Dan Zhang,Ruijin Yu
A novel single-phase trivalent europium activated red-emitting SrLaNaTeO 6 phosphor was first synthesized in a process of traditional high-temperature solid-state. The phase purity, morphology, and spectroscopy of the prepared phosphor were analyzed. Under 395 nm excitation, the photoluminescence (PL) spectra of the SrLaNaTeO 6 :Eu 3+ products mainly contained five dominant sharp peaks. The intense red emission peak at 615 nm was the typical 5 D 0 → 7 F 2 electric dipole transition of Eu 3+ . The optimum product of high quenching concentration was the SrLaNaTeO 6 :0.90Eu 3+ , which reached a high internal quantum efficiency (IQE) of 90.6%. The SrLaNaTeO 6 :0.90Eu 3+ was estimated to have R c of 6.57 Å and possessed high color purity of 100.0%. The phosphors exhibited excellent thermal stability and high activation energy ( E a = 0.29 eV). The prepared white light-emitting diode (WLED) had a high color rendering index (CRI) R a of 92 and a low correlated color temperature (CCT) of 5008 K. In conclusion, the phosphors have potential as red components for WLEDs.
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
·
2025
·
IF 5.6
Daomiao He,Likun Guan,Huayu Sun,Fanzhong Zeng,Fei Li,Leyi Zhang,Wenhao Li,Huajuan Deng,Dan Zhang,Ruijin Yu
A novel series of samarium-activated orange-red emitting CaY 2 Sb 2 (ZnO 4 ) 3 (CYSZO) phosphors has been successfully synthesized by the high-temperature solid-state method. The phase purity, spectroscopy, and morphological properties of the phosphors have been extensively characterized. When excited at 407 nm, CYSZO:Sm 3+ samples exhibited a pronounced orange-red emission peak at 610 nm, this corresponding to the typical 4 G 5/2 → 6 H 7/2 both magnetic-dipole and electric-dipole transitions of Sm 3+ ions. The optimal doping concentration was established as 10 mol%. The quenching mechanism is attributed to the interaction of the nearest-neighbor ions. The prepared sample showed a remarkable internal quantum efficiency (IQE) of 68.63 % and exceptional thermal stability at working temperature of the LEDs. As the Sm 3+ concentration increased, the decay time decreased correspondingly, ranging from 2.45 ms to 1.40 ms for concentrations ranging from 0.6 to 40 mol%. The phosphor materials exhibited high color purity, as evidenced by the Commission International de L'Éclairage (CIE) chromaticity coordinates. The synthesized white light-emitting diode (w-LED) exhibited an impressive color rendering index (CRI) of 96 and a desirable correlated color temperature (CCT) of 5674 K. Furthermore, the CYSZO:10 mol%Sm 3+ @oleic acid phosphor-stained latent fingerprint (LFP) images show excellent visualization capabilities on various surfaces with high contrast and long-term stability. These results highlight the potential of CYSZO:Sm 3+ phosphors to serve as a promising orange-red material for w-LED applications and LFP detection.
研究领域:
材料科学
·
光学
·
法医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 3
·1773-1781
·
IF 3.094
Xian Yang,Yu Zhang,Xuejie Zhang,Jian Chen,Haisen Huang,Dongsheng Wang,Xirong Chai,Gening Xie,Maxim S. Molokeev,Haoran Zhang,Yingliang Liu,Bingfu Lei
The red emission with suitable peak wavelength and narrow band is acutely required for high color rendering index (CRI) white LEDs without at the cost of the luminous efficacy. Herein, the Li 2 Ca 2 Mg 2 Si 2 N 6 :Eu 2+ red phosphor was prepared with facile solid-state method using Ca 3 N 2 , Mg 3 N 2 , Si 3 N 4 , Li 3 N, and Eu 2 O 3 as the safety raw materials under atmospheric pressure for the first time, which shows red emission peaking at 638 nm with full width at half maximum (FWHM) of 62 nm under blue light irradiation and becomes the desired red phosphor to realize the balance between luminous efficacy and high CRI in white LEDs. The morphology, structure, luminescence properties, thermal quenching behavior, and chromaticity stability of the Li 2 Ca 2 Mg 2 Si 2 N 6 :Eu 2+ phosphor are investigated in detail. Concentration quenching occurs when the Eu 2+ content exceeds 1.0 mol%, whereas high-temperature photoluminescent measurements show a 32% drop from the room-temperature efficiency at 423 K. In view of the excellent luminescence performances of Li 2 Ca 2 Mg 2 Si 2 N 6 :Eu 2+ phosphor, a white LEDs with CRI of 91 as a proof-of-concept experiment was fabricated by coating the title phosphor with Y 3 Al 5 O 12 :Ce 3+ on a blue LED chip. In addition, the potential application of the title phosphor in plant growth LED device was also demonstrated. All the results indicate that Li 2 Ca 2 Mg 2 Si 2 N 6 :Eu 2+ is a promising red-emitting phosphor for blue LED-based high CRI white LEDs and plant growth lighting sources.
研究领域:
材料科学
·
光电子学
·
固态照明
·
荧光粉化学
·
LED技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yanzhi Zhang,Xiang Guo,Minghao Zhang,Ruirui Cui,Jun Zhang,Chaoyong Deng
In this study, a Sm 3+ ion-doped double perovskite structure oxide was developed to obtain a novel Ca 2 GaNbO 6 : Sm 3+ orange-red phosphor, which has compensated for the lack of a red component in commercial wLEDs . The results of morphological features and phase structure have confirmed that the synthesized compound maintains the same structure as Ca 2 GaNbO 6, and that Sm 3+ successfully enters into the main lattice of Ca 2 GaNbO 6 . In terms of optical properties , the photoluminescence (PL) emission spectra monitored at 406 nm has the strongest emission peak at 599 nm and shows strong orange-red light. The spectral shapes of PL at different concentrations remain consistent without wavelength drift, and perform best when the concentration is 3 mol%, that is, the concentration quenching point is 3 mol%. The quenching phenomenon is believed to be mainly attributed to dipole-dipole (d-d) interaction. The Ca 2 GaNbO 6 : 0.03Sm 3+ phosphor shows excellent color purity (CP = 99.0 %) and low color temperature (CCT = 1664 K) in terms of chromaticity (CIE). In terms of heat resistance , the thermal stability of Ca 2 GaNbO 6 : 0.03Sm 3+ phosphor is 82.80 % (423 K). The internal quantum efficiency (IQE) is 34.4 %. In terms of applications, the wLEDs made of Ca 2 GaNbO 6 : 0.03Sm 3+ phosphor emits warm white light and exhibit excellent performance in color rendering index and correlated color temperature (CRI = 94.5, CCT = 3877 K). At the same time, Ca 2 GaNbO 6 : Sm 3+ phosphor shows good solubility in PVA . Research shows that Ca 2 GaNbO 6 : Sm 3+ phosphor has good performance in the fields of wLEDs and security ink.
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
危险品化学品经营许可证（带存储）