JOURNAL OF RARE EARTHS
·
2018
·
IF 2.524
Jiayu Li,Ran Pang,Zhan Yu,Liyan Liu,Haiyan Wu,Huimin Li,Lihong Jiang,Su Zhang,Jing Feng,Chengyu Li
A novel orange-red emitting Ba 3 Y 4 O 9 :Sm 3+ phosphors were prepared by a high temperature solid-state reaction in air. X-ray diffraction (XRD), photoluminescence spectra, fluorescence decay and temperature-dependent emission spectra were utilized to characterize the structure and luminescence properties. The results show that the excitation spectrum includes a series of linear peaks at 350, 367, 382, 410, 424, 445, 470 and 495 nm, respectively. Under 410 nm excitation, the emission peaks were located at 574 nm ( 4 G 5/2 — 6 H 5/2 ), 608 nm ( 4 G 5/2 — 6 H 7/2 ), 659 nm ( 4 G 5/2 — 6 H 9/2 ) and 722 nm ( 4 G 5/2 — 6 H 11/2 ), respectively. The concentration quenching occurs when x equals 0.08 for Ba 3 Y 4– x O 9 : x Sm 3+ phosphor and its mechanism is ascribed to the dipole–dipole interaction. The chromaticity coordinates of Ba 3 Y 3.92 O 9 :0.08Sm 3+ phosphor are in the orange-red region. The temperature-dependent study shows that this phosphor has excellent luminescence thermal-stability. And the luminescence intensity of Ba 3 Y 3.92 O 9 :0.08Sm 3+ phosphor at 473 K only declines by about 25.75% of its initial intensity. The experimental data indicate that Ba 3 Y 4 O 9 :Sm 3+ phosphor may be promising as an orange-red emitting phosphor for white light emitting diodes .
研究领域:
材料科学
·
光电
·
发光材料
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Min Zhang,Peipei Dang,Zixun Zeng,Dongjie Liu,Yujia Wan,Yi Wei,Hongzhou Lian,Guogang Li,Jun Lin
Development of ultra-broadband visible-to-near-infrared (VIS-NIR) luminescent materials is a challenging but rewarding endeavor, as they are highly desirable for a number of applications in photonics, optoelectronics, and biological sciences. Nevertheless, to date, rare earth-doped phosphors that can be efficiently excited by blue light and produce broadband emission in the VIS-NIR regions remain scarce. In this study, a series of Ce 3+ -doped Ba 3 M 4 O 9 (M = Sc, Lu, Y) broadband luminescent materials are designed based on low-coordination crystallographic lattice engineering. Among these materials, Ba 3 Y 4 O 9 :Ce 3+ produces a continuous ultra-wide VIS-NIR emission (λ em = 660 nm) in the range of 500–950 nm under 410 nm light excitation. This emission wavelength is the longest among those observed in Ce 3 ⁺-doped oxide materials. Structural refinement, theoretical calculation, and spectral analysis demonstrate that this VIS-NIR broadband emission is attributed to the occupying multiple distorted octahedral lattice sites by Ce 3+ in Ba 3 Y 4 O 9 . Several strategies are employed to enhance the luminescence intensity and thermal stability of this material, including the use of carbon paper coating, the incorporation of co-solvents, and the addition of GeO₂ or ZrO₂. Furthermore, the as-prepared materials demonstrate multifunctional applications in white light-emitting diodes (WLED), night vision, and fluorescent thermometers. This study offers insights into the design of Ce3+-doped ultra-wide VIS-NIR light-emitting materials.
研究领域:
材料科学
·
光学工程
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 5
·1085
·
IF 4.6
Dong Zhu,Chunfeng Wang,Xiaohuai Wang,Shun Han,Yuxiang Zeng,Ming Fang,Wenjun Liu,Deliang Zhu,Peijiang Cao,Youming Lu
The co-precipitation method was successfully used to synthesize Ba3(Y0.6−xGd0.4Eux)4O9(0.01 ≤ x ≤ 0.09) phosphors with heavy Gd3+doping, resulting in significantly enhanced thermal stability and luminescence performance. Structural analyses confirm that Gd3+and Eu3+ions substitute Y3+in the lattice, causing lattice expansion and improving crystal asymmetry, which enhances Eu3+emission. The incorporation of Gd3+creates efficient energy transfer pathways to Eu3+while suppressing non-radiative relaxation, leading to stable fluorescence lifetimes even at elevated temperatures. With a thermal activation energy of ~0.3051 eV, the Ba3(Y0.55Gd0.4Eu0.05)4O9phosphor exhibits superior resistance to thermal quenching compared to Ba3(Y0.95Eu0.05)4O9and many conventional red phosphors. Furthermore, the reduced color temperature and stable emission spectra across a wide temperature range highlight its potential for advanced lighting and display technologies in high-temperature environments.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）