INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Xiaolong Chen,Xiangyu Chen,Xuesong Zhai,Yin Li,Wei Zhao,Wu Sun,Qinfang Zhang,Jing Feng
Internal OH– defects always cause significant depletion of excitation energy for low upconversion efficiency; however, preventing the incorporation of OH– into the crystal lattice is very difficult during the synthesis of upconversion crystals. In this work, red upconversion emission is dramatically enhanced in Er3+-sensitized hexagonal NaLuF4 (β-NaLuF4) microcrystals through a collaborative effect of ion exchange and Tm3+ doping. The ion exchange can not only maintain the morphology very well but also strongly reduce the internal OH– defects, which can enhance the upconversion luminescence due to improved excitation energy harvesting and red to green (R/G) ratio due to intense cross-relaxation. Doping of Tm3+ as an energy trapping center not only regulates the red emission output but also reduces the excitation energy loss. β-NaLuF4:Er,Tm microcrystals after ion exchange exhibit stronger red upconversion emission compared with β-NaYF4:Er,Tm and β-NaGdF4:Er,Tm counterparts. Moreover, fluorescent labeling of the fingerprint pattern printed from β-NaLuF4:Er,Tm microcrystals with stable and intense red fluorescence has been demonstrated under 980 nm excitation.
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 LUMINESCENCE
·
2020
·
IF 3.28
Xing Cao,Shichang Sun,Bing Lu,Yan Liu,Rui Ma,Huiqun Cao,Hongzhi Ma,Hexun Huang
In order to overcome the shortcomings of insufficient red light component and poor thermal stability of commercial white light emitting diode (WLED), YAG:Ce, R (R: Gd 3+ , Pr 3+ , Gd 3+ and Pr 3+ ) fluorescent thin films were prepared by pulse laser deposition (PLD). The composition and microstructure, photoluminescence properties, and red-enhanced mechanism of co-doped YAG fluorescent thin films, as well as the electroluminescence behavior of the corresponding WLEDs were investigated. Results showed that the doping of Pr 3+ caused the emission spectrum energy of Ce 3+ to migrate, and an emission peak appeared at 606 nm in the red region. The doping of Gd 3+ caused the emission spectrum of Ce 3+ to shift to the red region, and the main peak position of the Ce 3+ emission spectrum is red-shifted from 523 nm to 548 nm. The YAG:Ce,Pr,Gd fluorescent film not only realized the improvement of red light components and red-shift, but also increased the energy transmission efficiency from 33.3% to 51.9%. Moreover, results of the color coordinate analysis also showed that the co-doping of Gd 3+ and Pr 3+ made the luminescence closer to the red region, reducing the color temperatures and hues changed to warm. Thus, tri-doped transparent fluorescent thin film were prospective for WLED application.
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
RSC Advances
·
2016
·Vol. 6
·期 86
·83321-83327
·
IF 3.289
Zhangyu Huang,Huiping Gao,Yanli Mao
In this study, the energy transfer (ET) mechanism among Yb3+/Er3+/Mn2+ has been revealed by download conversion (DC) and upconversion (UC) transients and steady-state fluorescence spectra. Moreover, the novel structure, inert-core/active-shell/inert-shell cubic NaYF4@NaYF4:Er3+/Yb3+/Mn2+@NaYF4, has been synthesized via a convenient hydrothermal method. With the excitation of a 980 nm laser diode, bright single-red upconversion (UC) fluorescence is observed, which shows the longest UC lifetime and highest efficiency compared with the other structures of NaYF4:Er3+/Yb3+/Mn2+, NaYF4:Er3+/Yb3+/Mn2+@NaYF4, and NaYF4@NaYF4:Er3+/Yb3+/Mn2+. The inert-core/active-shell/inert-shell nanocubes are homogeneous with an ultra-small (sub-20 nm) size, which is suitable for distribution and elimination in biological tissue. Our results indicate that the Mn2+ doping of δ-doped structures is an effective method to significantly improve UC single-red light, which shows great potential application in vivo bioimaging.
研究领域:
材料科学
·
生物成像
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE COMMUNICATIONS
·
2017
·
IF 1.554
Jingjing Chen,Yang Zhao,Guanghao Li,Zhiyong Mao,Dajian Wang,Lijian Bie
In this paper, facile synthesis of CaAlSiN 3 :Ce 3+ yellow-emitting phosphors under atmospheric pressure at a moderate temperature and their photoluminescent properties are reported. The prepared CaAlSiN 3 :Ce 3+ phosphors exhibit a broad yellow emission band positioned at 580 nm and covering a bandwidth of 150 nm. The thermal stability of CaAlSiN 3 :Ce 3+ phosphors shows obvious superiority than the commercial YAG: Ce 3+ phosphor, indicating its promising application prospect in power LEDs . In addition, the enhancement of red-light component for CaAlSiN 3 :Ce 3+ phosphor is demonstrated by co-doping Eu 2+ ions. This study offers a facile route to prepare CaAlSiN 3 :Ce 3+ yellow-emitting phosphors, which may be used as a promising candidate for high performance white LEDs .
研究领域:
材料科学
·
发光材料
·
无机化学
·
固态照明
·
光电功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ziqiang Jiang,Laian Sheng,Jingtian Li,Guodong Sun,Weihua Luo,Peng Zhao
In present work, Ce 3 + -doped Y 3 Al 5 O 12 (YAG: Ce) transparent ceramics were fabricated via spark plasma sintering (SPS) using Si 3 N 4 as a multifunctional sintering additive. The effects of Si 3 N 4 on the microstructure, densification behavior, and luminescent properties were systematically investigated. It is demonstrated that Si 3 N 4 could be effectively incorporated into the YAG lattice through a charge-balanced substitution mechanism in which Si 4+ -N 3- pairs replace Al 3+ -O 2- , resulting in a significant redshift of the Ce 3+ emission from 545 nm to 582 nm due to enhanced crystal field splitting and nephelauxetic effects. Furthermore, the substitution process also yields in-situ formation of SiO 2 , which promotes densification via liquid-phase sintering, achieves a relative density exceeding 99.5 %, and partially mitigates carbon contamination. When applied in phosphor-converted white LEDs, the Si 3 N 4 -doped YAG: Ce ceramics enabled a substantial reduction in correlated color temperature (CCT) from 4903 K to 3196 K, demonstrating their potential as efficient warm-white light converters without requiring additional red phosphors.
研究领域:
材料科学
·
无机非金属材料
·
发光材料
·
固态照明
·
陶瓷工艺
✓ 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）