Advanced Optical Materials
·
2022
·Vol. 11
·期 3
·2202323
·
IF 10.05
Chaojie Li,Jiyou Zhong
Near-infrared (NIR) spectroscopy based on phosphor-converted light-emitting-diode (pc-LED) has promising applications in food quality analysis, security monitoring, medical diagnosis, and bioimaging fields, stimulating the demand of developing NIR phosphors with high-performance. Herein, a highly efficient and thermally robust Ca 3 MgHfGe 3 O 12 :Cr 3+ NIR phosphor is discovered, which exhibits a broadband NIR emission (λ em = 800 nm) covering 700 to 1100 nm region with an internal quantum efficiency as high as 90.7% when excited by 460 nm blue light. Moreover, the emission intensity at 423 K retains 84.5% of that at room temperature. The highly efficient and thermally robust luminescence of this material is mainly ascribed to the ultrawide bandgap of host, extremely weak electron–photon coupling effect, defect-free, and highly structural rigidity. The NIR pc-LED device fabricated by using the optimized Ca 3 Mg 0.97 Hf 0.97 Ge 3 O 12 :0.06Cr 3+ phosphor combined with blue (λ em = 455 nm) LED chip produces an excellent NIR output power of 49.5 mW @ 11.5% under a driving current of 150 mA, which indicates a superiority to the device fabricated by using the well-known efficient ScBO 3 :Cr 3+ phosphor under the same condition. Therefore, this work not only provides a promising broadband NIR material, but also highlights the design rules for searching high-performance NIR materials toward spectroscopy applications.
研究领域:
材料科学
·
光电技术
·
光谱学
✓ 已验证
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 19
·1900484
·
IF 10.856
Xiaosheng Tang,Weiwei Chen,Zhengzheng Liu,Juan Du,Zhiqiang Yao,Yi Huang,Cheng Chen,Zhaoqi Yang,Tongchao Shi,Wei Hu,Zhigang Zang,Yu Chen,Yuxin Leng
All-inorganic semiconductor perovskite quantum dots (QDs) with outstanding optoelectronic properties have already been extensively investigated and implemented in various applications. However, great challenges exist for the fabrication of nanodevices including toxicity, fast anion-exchange reactions, and unsatisfactory stability. Here, the ultrathin, core–shell structured SiO 2 coated Mn 2+ doped CsPbX 3 (X = Br, Cl) QDs are prepared via one facile reverse microemulsion method at room temperature. By incorporation of a multibranched capping ligand of trioctylphosphine oxide, it is found that the breakage of the CsPbMnX 3 core QDs contributed from the hydrolysis of silane could be effectively blocked. The thickness of silica shell can be well-controlled within 2 nm, which gives the CsPbMnX 3 @SiO 2 QDs a high quantum yield of 50.5% and improves thermostability and water resistance. Moreover, the mixture of CsPbBr 3 QDs with green emission and CsPbMnX 3 @SiO 2 QDs with yellow emission presents no ion exchange effect and provides white light emission. As a result, a white light-emitting diode (LED) is successfully prepared by the combination of a blue on-chip LED device and the above perovskite mixture. The as-prepared white LED displays a high luminous efficiency of 68.4 lm W −1 and a high color-rendering index of Ra = 91, demonstrating their broad future applications in solid-state lighting fields.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
半导体物理
·
固体照明
·
无机化学
·
功能材料
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2026
·
IF 6.7
Wanqing Qian,Yan Shu,Cai Pan,Xueqing Yu,Weitao Su,Mikhail P. Kuz'min,Kaixin Song
Near-infrared phosphor conversion light emitting diode (NIR pc-LED) has important application value in plant growth, night vision imaging and biological detection. Its performance depends on the optimized design of fluorescent materials. Based on gadolinium gallium garnet (Gd 3 Ga 5 O 12 ), the near-infrared phosphors of Gd 2.5 (CaSn) 0.5 (InAl) 0.5 Ga 3.5-x O 12 : xCr 3+ (x = 0.01–0.09) were prepared by Ca 2+ -Sn 4+ /In 3+ -Al 3+ double ion pair synergistic substitution strategy. Under excitation of 450 nm blue light, the material exhibits broadband near-infrared emission covering the range of 650–1150 nm, with a quantum yield of 96.29 %. The material exhibits excellent thermal stability of luminescence and can maintain 82.4 % of the initial emission intensity at room temperature at 423K. The NIR pc-LED device based on this phosphor package achieved 67.37 mW output power and 16.68 % photoelectric conversion efficiency at 100 mA driving current. Application verification shows that the NIR pc-LED light source shows excellent performance in plant supplementary light, night vision security, information encryption and nondestructive testing applications. It fully proves that the broadband near-infrared emission of this series of phosphors can take into account multi-functional application scenarios and has broad development prospects.
✓ 已验证
产品关联
DOI
高影响因子
COMPUTERS IN BIOLOGY AND MEDICINE
·
2021
·
IF 4.589
Shuai-nan Zhang,Ya-feng He,Xu-zhao Li,Wu-de Yang,Ying Zhou
Previous studies have shown that Sophorae Tonkinensis radix et rhizome (ST) can be used to treat some lung diseases . However, the therapeutic potentials, therapeutic advantages, mechanism of action, and material basis of ST treatment of lung diseases remain unclear. Thus, the aim of this study was to carry out an integrated analysis based on the biolabel-led research pattern. Proteomics and metabonomics were applied to explore the biolabels responsible for the effect of ST on lung tissue. Based on the biolabels, a bioinformatics database was used to topologically analyze the therapeutic potentials, therapeutic advantages, mechanism of action, and material basis of ST in treating lung diseases. Four human lung-cancer cell models were used to validate the results of the biolabel analysis. In total, 45 proteins and 3 metabolites were significantly enriched in 13 pathways and were considered as biolabels. Bioinformatics revealed that the therapeutic potentials of ST involved a variety of lung diseases, especially lung neoplasms. Under the mediation of 40 biolabels, 29 compounds may be the material basis of ST in treating lung diseases. In a verification experiment, ST had a significant inhibitory effect on the H226 cell line (lung squamous cell carcinoma), which ranks first in morbidity and mortality among lung cancers in China. Additionally, five biolabels (CPS1, CKM, CPT1B, COX5B, and COX4I1) were involved in the anti-lung cancer mechanism of ST and 3 compounds (gallic acid, betulinic acid , and caffeic acid). These findings indicate that the biolabel-led research pattern was helpful in achieving the objectives of this study.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Song Wang,Peiqing Cai,Tianmou Xu,Xipeng Pu,Peng Du,Xiangfu Wang,Ying Tang,Xiaolin Yuan,Huacai Chen,Qi Ai,Junjie Si,Xin Yao,Maxim K. Rabchinskii,Pavel N. Brunkov,Zugang Liu
The electronic structure modulations by metal cation doping and organic ligands modification are aroused great interests in perovskite community for spectrum tailoring and quantum yield (QY) enhancement. Herein, we synthesized the two-dimensional (2D) lead bromide perovskite with cyclohexenylethylamine as the organic ammonium ligands and divalent manganese as the doping ions by the combination of facile solution processes and low temperature solid-state method. Thanks to the synergy effects of the steric-hindrance induced self-trapped exciton (STE) by A-site engineering and the elevation of cascaded energy funneling among the FE, STE and the 4 T 1 → 6 A 1 transition of Mn 2+ . The emission spectrum of the Mn 2+ doped 2D perovskite simultaneously covers both the blue and orange range with a QY of 47.01%, where the value is about twelve times of that of the un-doped one at room temperature . Our results indicate that the utilizing of soft organic ammonium and Mn 2+ doping in 2D perovskite could not only adjust the energy level states and improve the QY remarkably, but also explore new opportunities in warm-white LEDs and other applications.
研究领域:
材料科学
·
光电技术
·
光子学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 30
·9167-9174
·
IF 6.641
Chong Li,Baojun Ding,Lijing Zhang,Kepeng Song,Shengyang Tao
Organometal halide perovskite nanocrystals have received extensive attention as a high-performance photoelectric conversion material. However, the perovskite nanocrystals prepared by the traditional batch reactor have uncontrollable size and optical properties, low utilization of raw materials, and complicated purification treatment. In this paper, a flow microreactor is designed with the assistance of finite element analysis and realized the continuous synthesis of CH3NH3PbX3 nanocrystals with a 100% yield. The average size of the prepared nanocrystalline grains is as low as 3.9 nm without any purification step. The prepared nanocrystals have narrow-band emission characteristics (the full width at half-maximum is down to 18 nm), and the quantum yield can reach 76.9%. It is also possible to prepare CH3NH3PbX3 (X = Br, I) nanocrystals covering different emission wavelengths in the visible light region by this method. The coating of a polystyrene film improved the stability of the perovskite nanocrystals. The flexible hybrid film is applied to modify a LED device, and a white LED luminescence spectrum is obtained.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
化学工程
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jieyan Zhao,Yingnan Song,Zengchao Yang,Yong Li,Jiangtao Li
Daytime radiative cooling enables passive cooling of objects without consuming energy. However, it is a challenge for most radiative cooling films to achieve exceptional solar reflectivity , infrared emissivity and thermal conductivity simultaneously, which limits their applications in above-ambient conditions such as electrical equipment . Herein, we prepare highly solar-reflective β -Si 3 N 4 dielectric particles with solar reflectivity exceeding 0.91 and atmospheric window emissivity of 0.93 by one-step combustion synthesis . The radiative cooling film consisted of β -Si 3 N 4 particles and PVDF matrix achieves a subambient cooling performance of 11.63 °C and theoretically yields a radiative cooling power of 45.41 W m −2 in the daytime. Futhermore, the film exhibits high thermal conductivity of 3.19 W m −1 K −1 due to the heat conducting pathways constructed by elongated rod-like β -Si 3 N 4 particles, which leads to a remarkable temperature drop of 5.00 °C when be applied on the surface of 5 W LED. The film reported here provides a practical option for the efficient radiative cooling and heat dissipation of electrical equipment.
研究领域:
材料科学
·
热能工程
·
光子学
·
能源效率
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 22
·2010009
·
IF 18.808
Zhiteng Wang,Rui Fu,Fei Li,Huidong Xie,Peiwen He,Qi Sha,Zuobin Tang,Na Wang,Haizheng Zhong
All-inorganic CsPbBr 3 perovskite quantum dots (PQDs) exhibit excellent photoelectric properties and application prospects in the field of light-emitting diodes (LEDs) and display devices. However, these possess poor long-term stability to UV irradiation, water, heat, and oxygen. Using polymethyl methacrylate (PMMA) as the matrix along with CH 3 (CH 2 ) 16 COOCs, [CH 3 (CH 2 ) 16 COO] 2 Pb, and KBr as the perovskite sources, CsPbBr 3 PQDs/PMMA composites are for the first time prepared via an in situ polymeric melt encapsulation method. Special attention is paid to the effects of synthesis conditions on the photoluminescent quantum yield (PLQY) of the composites. The optimized CsPbBr 3 PQDs/PMMA composite reveals excellent performance with ≈82.7% PLQY and ≈18.6 nm full width at a half-maximum (FWHM). In particular, after 90 h of UV irradiation or 35 days of heating at 60 °C, the luminous intensity remains almost unchanged. In addition, after soaking in water for 15 days, it retains up to ≈53% of the initial luminous intensity, meaning that the composite possesses long-term stability to UV irradiation, heat, and water. The as-prepared white LED (WLED) based on the composite evidences the wide color gamut (126.5% National Television System Committee (NTSC)) and a luminous efficiency of 32 lm W −1 . This work offers a novel, easily industrialized one-step, and solvent free route for low-temperature synthesis of all-inorganic PQDs with broad application prospects.
研究领域:
材料科学
·
光电材料
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Ke Chen,Peixin Gao,Zengtao Zhang,Yibiao Ma,Zan Luo,Maxim S. Molokeev,Zhi Zhou,Mao Xia
Bi 3+ -activated phosphors have been proven to have potential applications foreground in white light-emitting diodes (WLED), plant growth lamps and temperature sensing. Therefore, it is urgent to exploit high-efficiency Bi 3+ -activated phosphors. Herein, a novel broadband yellow-emitting phosphor Ba 2 GdGaO 5 :Bi 3+ with high internal quantum efficiency (IQE = 77%) was obtained based on metal to metal charge transfer (MMCT) between Bi 3+ ground state and Gd 3+ excited states. The photoluminescence excitation (PLE) spectrum and photoluminescence (PL) spectrum range from 225 nm to 400 nm and 400 nm to 700 nm, respectively, which can avoid the reabsorption phenomenon efficiently. Besides, Ba 2 GdGaO 5 :Bi 3+ has superior thermal stability and it shows zero-thermal-quenching at 150 °C. The K + doping hardly changes the thermal stability and can improve the PL intensity to 133.1% when the K + concentration is 2%. Finally, a phosphor-convert WLED (pc-WLED) was simply synthesized by Ba 2 GdGaO 5 :Bi 3+ and BaMgAl 10 O 17 :Eu 2+ (BAM:Eu 2+ ) phosphors. The doping of Eu 3+ can significantly enhance the color rendering index (CRI, from 88.1 to 91.5) and reduce the correlated color temperature (CCT, from 4911 K to 4014 K). The above experimental results demonstrated that the phosphor has great application prospect in WLED.
研究领域:
材料科学
·
发光材料
·
固态化学
·
光电子学
·
无机功能材料
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 22
·15452-15462
·
IF 3.3
Zurong Liao,Jiyou Zhong,Chaojie Li,Huan Jiang,Weiren Zhao
Broadband near-infrared (NIR) spectroscopy generated from a phosphor-converted light-emitting diode (pc-LED) has multifunctional applications, including food-quality analysis, bio-medical and night-vision, stimulating the demand for developing various NIR phosphors with desired properties. Herein, we selected a highly distorted garnet Ca4HfGe3O12 as the host and explored the near-infrared luminescence of Cr3+. As expected, this material achieved a long-wavelength NIR emission and excellent absorption efficiency based on the effect of Jahn–Teller distortion. The synthesized Ca4HfGe3O12:Cr3+ phosphor exhibits a broadband NIR emission peaking at 840 nm with a full width at half maximum of 150 nm, and the absorption efficiency reaches 48.0%. However, the internal quantum efficiency of the 6 mol% Cr3+-doped sample was measured to be only 35.3% and the integral emission intensity at 373 K kept only 60.1% of the initial intensity. The possible reasons for the unsatisfactory internal quantum efficiency and thermal stability were systematically analyzed, which provided a comprehensive understanding of the relationship between the crystal structure and the luminescent properties of Cr3+-activated garnet-type phosphors. Nevertheless, the as-prepared NIR pc-LED device exhibits a NIR output of 16.52 mW with a NIR photoelectric conversion efficiency of 5.92% driven by 100 mA current, indicating the potential of this material for application in NIR pc-LED.
研究领域:
材料科学
·
光学
·
光子学
·
固体物理
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Peipei Dang,Dongjie Liu,Yi Wei,Guogang Li,Hongzhou Lian,Mengmeng Shang,Jun Lin
Phosphor-converted white-light-emitting diodes (pc-WLEDs) rely on combining a near-ultraviolet (n-UV) or blue chip with trichromatic and yellow-emitting phosphors. It is challenging to discover cyan-green-emitting (480–520 nm) phosphors for compensating the spectral gap and producing full-spectrum white light. In this work, we successfully discovered two unprecedented bright cyan-green emitting Rb3RV2O8 (R = Y, Lu) phosphors that gives emission bands centered at 500 nm upon 362 nm n-UV light excitation. Interestingly, the both self-activated compounds exhibit high internal quantum efficiencies (IQEs) of 71% for Rb3YV2O8 and 85% for Rb3LuV2O8, respectively. Moreover, controllable emission color can be successfully tuned from cyan-green to orange-red across the warm white light region by design strategy of VO43– → Eu3+ energy transfer. The thermal quenching of as-prepared phosphors could be effectively mitigated by this design strategy. Finally, the as-fabricated n-UV (λex = 370 nm) pumped phosphor-converted (pc) W-LED devices utilizing Rb3RV2O8 (R = Y, Lu) along with commercial phosphors demonstrate well-distributed warm white light with high color-rendering index (CRI) of 91.9 and 93.5, and a low correlated color temperature (CCT) of 5095 and 4946 K. It suggests that the both vanadate phosphors have potential applications in full-spectrum pc-WLEDs.
研究领域:
材料科学
·
光电子学
·
固态照明
·
无机化学
·
光子学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 44
·17989-18002
·
IF 3.5
Jie Zhang,Langping Dong,Feng Wang,Jingshan Hou,Yongzheng Fang
Cyan-emitting phosphors are urgently needed to address the “cyan gap” in artificial full-spectrum lighting. In this research, a series of Sr(2−y)BayY4La4(SiO4)6O2:xEu2+ (0.005 ≤ x ≤ 0.08, 0.0 ≤ y ≤ 2.0) phosphors with tunable luminescence was synthesized. Through cation regulation, the luminescence color of Sr(2−y)BayY4La4(SiO4)6O2:xEu2+ can be adjusted from yellow to cyan. Crystal structure analysis revealed that Eu2+ ions simultaneously occupy [Sr1/Ba1Y1La1] and [Sr2/Ba2Y2La2] sites, resulting in multiple luminescence centers and a broadened emission spectrum. With increasing Ba2+ ion concentration, the PLE spectrum was red-shifted from 337 nm to 372 nm, and the excitation intensity in the violet region was significantly enhanced, making it more compatible with violet LED chips. Meanwhile, the PL spectrum was blue-shifted from 543 nm to 496 nm with increasing Ba2+ concentration, accompanied by an increase of about 10 times in the excitation and emission intensity. The optimized Ba2Y4La4(SiO4)6O2:0.02Eu2+ phosphor can be excited by violet light and emits bright cyan light effectively, which can be used to fill the “cyan gap”. Eventually, a series of white LED devices was manufactured by combining the as-prepared luminescence-tunable phosphors with commercial phosphors. Among them, the 410 nm violet LED chip-based WLED(Ba2) device comprising Ba2Y4La4(SiO4)6O2:0.02Eu2+ exhibited the best electroluminescence performance, increasing the color rendering index from 82.0 to 98.6, verifying the compensation effect of the Ba2Y4La4(SiO4)6O2:Eu2+ phosphor on cyan light.
研究领域:
材料科学
·
光电子学
·
固态照明
·
无机化学
·
发光材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）