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
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Lei Yanhua,Zhang Anlin,Li Dongdong,Li Feng,Sun Huapeng,Deng Bin
A series of newly synthesized red-emitting phosphors, La 3 Ga 5 SnO 14 :Eu 3+ , were produced through high-temperature solid-state synthesis methods. The phase purity, particle morphology and optical properties were systematically investigated in this work. The prepared fluorescent material has high phase purity. La 3 Ga 5 SnO 14 :Eu 3+ has a strong red emission peak at 612 nm at the excitation at 268 nm, which is caused by the radiative transitions of electrons ( 5 D 0 → 7 F 2 ). The optimal doping concentration of Eu 3+ was observed to be 30 mol% in this series of La 3 Ga 5 SnO 14 :Eu 3+ . The mechanism of concentration quenching was determined to be dipole-quadrupole interaction. The chromaticity coordinates of La 3 Ga 5 SnO 14 :30 mol%Eu 3+ were (0.648, 0.352) with a corresponding high color purity of 100%. The thermal stability of the phosphor was also characterized. The luminous intensity could be sustained at 54% at 480 K. The quantum efficiency of the La 3 Ga 5 SnO 14 :30 mol%Eu 3+ phosphor is 64.4%. The exhaustive findings from this study form the basis for advocating the application of these phosphors in light-emitting devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Ling Liang,Kai-Yue Liu,Guang Yang,Zeng-Min Xue,Wen-Xuan Zhao,Hong-Tao Lin,Shu-Hai Chen,Chuan-Zeng Wang,Mark R.J. Elsegood,Simon J. Teat,Ming Wang,Takehiko Yamato
The application of organic luminescent materials is becoming diversified in the fields of display technology, imaging, chemosensors and information encryption, but improving luminescent efficiency and color purity remains a challenge. Herein, new insight for fine tuning asymmetrical pyrene-based luminogens is discussed by constructing Donor-π-Acceptor (D-π-A) type molecules along the short axis at the pyrene core. Further experiments and calculations demonstrate the possibility of dual emission with near-white color emitting and narrow full-width half maximum (FWHM) materials (∼12 nm for 7- tert -butyl-1-phenyl-3-carbazolylpyrene ( CzPy) in film) by regulating electron-donating/withdrawing groups. Experimental results prove that the luminescent efficiency shows strong competitiveness in the solid state (14.3% for CzPy ) and in the pyrene luminogen-doped amorphous polymer (29.5% for 7- tert -butyl-1-phenyl-3- N,N -diphenylaminopyrene ( DPaPy )). The narrow FWHM dedicated to improving color purity and reasonable luminescent efficiency were achieved. Furthermore, these findings not only enabled development of a new application of latent fingerprint extraction with high resolution but also provided an innovative strategy for the fabrication of flexible light source displays.
研究领域:
材料科学
·
化学
✓ 已验证
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
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
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
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Changyan Ji,Zhi Huang,Xiuying Tian,Hengping He,Jin Wen,Yangxi Peng
A series of red emitting phosphors Mg 3 Y 2-x Ge 3 O 12 :xSm 3+ (0≤x ≤ 0.06) were successfully synthesized. Samples Mg 3 Y 2-x Ge 3 O 12 :Sm 3+ exhibited a cubic structure pertaining to the I a-3d (230) space group and the particle sizes range from 1 μm to 5 μm. The optical properties displayed that the optimum doping concentration of Sm 3+ is 4%. The phosphor Mg 3 Y 1.96 Ge 3 O 12 :0.04Sm 3+ not only exhibited a broad band gap of 5.54 eV but also showed a high color purity of 97.6%. In addition, the strongest emission intensity located at 566 nm belonged to the 4 G 5/2 → 6 H 5/2 transition when excited at 405 nm. Thermal quenching test revealed that the sample Mg 3 Y 1.96 Ge 3 O 12 :0.04Sm 3+ are excellent powders with splendid thermal stability, in which only 3.6% of the PL intensity is quenched at 473 K in comparison with that of 298 K. As a result, the W-LEDs based on Mg 3 Y 1.96 Ge 3 O 12 :0.04Sm 3+ yielded a high R a of 91.1, a low CCT of 4881 K, and CIE coordinates of (0.3476, 0.3466) in a 20 mA driven current. This research work provided important guidance for the synthesis of Sm 3+ doped red component with excellent luminesce properties and high thermal stability characteristics used in 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
Small
·
2023
·Vol. 19
·期 45
·2303247
·
IF 13.3
Yuhe Bi,Sheng Cao,Peng Yu,Zhentao Du,Yunjun Wang,Jinju Zheng,Bingsuo Zou,Jialong Zhao
High color purity blue quantum dot light-emitting diodes (QLEDs) have great potential applications in the field of ultra-high-definition display. However, the realization of eco-friendly pure-blue QLEDs with a narrow emission linewidth for high color purity remains a significant challenge. Herein, a strategy for fabricating high color purity and efficient pure-blue QLEDs based on ZnSeTe/ZnSe/ZnS quantum dots (QDs) is presented. It is found that by finely controlling the internal ZnSe shell thickness of the QDs, the emission linewidth can be narrowed by reducing the exciton-longitudinal optical phonon coupling and trap states in the QDs. Additionally, the regulation of the QD shell thickness can suppress the Förster energy transfer between QDs in the QLED emission layer, which will help to reduce the emission linewidth of the device. As a result, the fabricated pure-blue (452 nm) ZnSeTe QLED with ultra-narrow electroluminescence linewidth (22 nm) exhibit high color purity with the Commission Internationale de l'Eclairage chromatic coordinates of (0.148, 0.042) and considerable external quantum efficiency (18%). This work provides a demonstration of the preparation of pure-blue eco-friendly QLEDs with both high color purity and efficiency, and it is believed that it will accelerate the application process of eco-friendly QLEDs in ultra-high-definition displays.
研究领域:
材料科学
·
光电技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Hong Ming,Shuifu Liu,Lili Liu,Jiaqing Peng,Junxiang Fu,Fu Du,Xinyu Ye
A new generation of red phosphors of complex fluoride matrices activated with Mn4+ has gained a broad interest in getting high color quality and low color temperature of solid-state white light-emitting diodes (WLEDs). However, besides their instability toward moisture, the extremely irregular and nonuniform morphologies of these phosphors have limited their practical industry applications. In the present study, a novel type of K3ScF6:Mn4+ red phosphor with highly regular, uniform, and high color purity was obtained successfully through a facile coprecipitation route under mild conditions. The crystal structure was identified with aids of the powder X-ray diffraction, Rietveld refinement, and density functional theory calculations. The prototype crystallizes in the space group Fm3m with a cubic structure, and the lattice parameters are fitted well to be a = b = c = 8.4859(8) Å and V = 611.074(2) Å3. The Mn4+ ions occupy Sc3+ sites and locate at the centers of the distorted ScF6 octahedrons. A wide band gap of approximately 6.15 eV can provide sufficient space to accommodate impurity energy levels. Unlike most other Mn4+ ion-activated fluoride phosphors, the as-prepared K3ScF6:Mn4+ phosphors demonstrate highly uniform and regular morphologies with shapes transforming from cube to octahedron with increasing Mn4+ ion concentration. Under blue light excitation, the as-prepared K3ScF6:Mn4+ sample exhibits intense sharp-line red fluorescence (the strongest peak located at 631 nm) with high color purity. An excellent recovery in luminescence upon heating and cooling processes implies high stability of K3ScF6:Mn4+. Furthermore, a warm WLED fabricated with blue GaN chips merged with the mixture of K3ScF6:Mn4+ and the well-known commercial YAG:Ce3+ yellow phosphors exhibits wonderful color quality with lower correlated color temperature (3250 K) and higher color-rendering index (Ra = 86.4). These results suggest that the K3ScF6:Mn4+ phosphor possesses stupendous potentiality for practical applications.
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
Nanoscale
·
2021
·Vol. 13
·期 8
·4562-4568
·
IF 7.79
Zhiwen Yang,Qianqian Wu,Xiaochuan Zhou,Fan Cao,Xuyong Yang,Jianhua Zhang,Wanwan Li
Environment-friendly high color purity blue zinc selenide (ZnSe) quantum dot-based light-emitting diodes (QLEDs) are promising candidates in next-generation display applications. However, due to the large bandgap of ZnSe (2.7 eV), the reported electroluminescence (EL) wavelengths of ZnSe QLEDs are mainly located within the range from purple to violet blue, and preparing blue emitting (>445 nm) ZnSe QLEDs remains challenging. Herein, we report a seed-mediated and double shell strategy to synthesize large-sized blue ZnSe/ZnS/ZnS core/shell/shell quantum dots (QDs). The as-prepared QDs possess excellent features including narrow full widths at half-maximum (11–19 nm), tunable emission wavelengths (410–451 nm), and high photoluminescence quantum yields (≥50%). Using ZnSe/ZnS/ZnS QDs as emitters in an inverted device, a color saturated blue QLED with an EL wavelength of 446 nm, a maximum luminance of 106 cd m−2, a current efficiency of 0.94 cd A−1, and an EQE of 2.62% is successfully fabricated. These results indicate that blue ZnSe QLEDs have great potential for future display technologies.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yong Liu,Shuai Cheng,Shengchun Yang,Zongtao Li,Zhenjuan Duan,Zhanjiang Hu,Zhengui Li,Yuehua Li,Lili Yu,Anzhong Peng,Xiaodong Wen
A series of Mn 4+ doped cubic phase Cs 2 KInF 6 red phosphors (abbreviated here as CKIFM) were obtained through a typical co-precipitation route. The optical and structural properties of this material were researched in more detail using X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL) and photoluminescence excitation (PLE), diffuse reflectance spectroscopy (DRS), temperature-dependent PL and lifetimes. Interestingly, the as-prepared CKIFM phosphors have a strong and broad absorption band in the blue area with a peak at 468 nm, and bright narrow-band red fluorescence with high colour purity. Furthermore, the optimum quenching concentration, crystal field parameters (CFPs), internal quantum efficiency (IQE), and the corresponding concentration quenching mechanism are discussed and analyzed in detail. Finally, the WLED backlight using the obtained CKIFM red-emitting phosphor and β-SiAlON:Eu 2+ (β-Sialon:Eu 2+ ) green-emitting phosphor demonstrates a wide color gamut (∼101.7% National Television System Committee standard (NTSC)), revealing the title phosphor is an attractive red component for backlight displays.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Science Bulletin
·
2025
·
IF 21.1
Bo-Chen Liu,Qizhong Lin,Shuang-Qiao Sun,Qi Sun,Xing Peng,Xinyuan Chen,Yang Li,Yue-Min Xie,Shuit-Tong Lee,Man-Keung Fung
High-quality quantum dots (QDs) possess superior electroluminescent efficiencies and ultra-narrow emission linewidths are essential for realizing ultra-high definition QD light-emitting diodes (QLEDs). However, the synthesis of such QDs remains challenging. In this study, we present a facile high-temperature successive ion layer adsorption and reaction (HT-SILAR) strategy for the growth of precisely tailored Zn 1− x Cd x Se/ZnSe shells, and the consequent production of high-quality, large-particle, alloyed red CdZnSe/Zn 1− x Cd x Se/ZnSe/ZnS/CdZnS QDs. The transitional Zn 1− x Cd x Se/ZnSe shells serve to effectively suppress heavy hole energy level splitting and weaken the exciton–longitudinal optical phonon coupling of QDs, thus facilitating the formation of highly luminescent QDs with a near-unity photoluminescence quantum yield of 97.8% and narrow emission with a full width at half maximum of 17.1 nm. In addition, the introduction of transitional shells can extend the particle size of QDs to 19.0 nm, which is beneficial for efficient carrier recombination and reduced Joule heating in QD-based LEDs. As a result, the fabricated QLEDs can achieve a record external quantum efficiency of 38.2%, luminance over 120,000 cd m −2 , and exceptional operational stability T 95 (tested at 1,000 cd m −2 ) of 24,100 hours. These findings provide new avenues for synthesizing high-quality QDs with high color purity.
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
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
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
·
光学
✓ 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）