Effects of charge transfer band position and intensity on the photoluminescence properties of Ca1.9M2O7:0.1Eu3+ (M = Nb, Sb and Ta)

(Gd,La)2-x O2CO3:Eux3+(0.01 ≤x≤0.04) were synthesized via a flux method at 400°C, and their photoluminescence properties under vacuum ultraviolet (VUV) excitation were examined. The excitation spectra showed two bands in the region from 125 nm to 300 nm, the first band centered at 190 nm was ascribed to absorption of related CO32- complex, and the second broad band centered at 246nm and 278nm in Gd2O2CO3:Eu3+ was ascribed to the charge transfer band of O2-→ Eu3+. Series samples exhibited red emission at around 611 nm under vacuum ultraviolet excitation corresponding to the 5D0→ 7F2.transition of Eu3+.

Download Full-text

Photoluminescence of Lu2O3:Eu3+ Phosphors Obtained by Glycine-nitrate Combustion Synthesis

Journal of Materials Research ◽

10.1557/jmr.2005.0183 ◽

2005 ◽

Vol 20 (6) ◽

pp. 1409-1414 ◽

Cited By ~ 10

Author(s):

Qiwei Chen ◽

Ying Shi ◽

Jiyang Chen ◽

Jianlin Shi

Keyword(s):

Grain Size ◽

Ignition Temperature ◽

Charge Transfer Band ◽

Photoluminescence Properties ◽

Solution Combustion ◽

Band Position ◽

Crystallite Sizes ◽

Glycine Nitrate Combustion ◽

Peak Emission ◽

The Eu

Eu3+-doped Lu2O3 phosphors were synthesized through a novel solution combustion route using glycine as the fuel. The influence of the glycine-to-nitrate (G/N) mole ratio on the crystallite size, specific surface area, morphology, and photoluminescence of the synthesized phosphors was investigated. The ignition temperature on the properties of the products was also studied. With G/N ratio increasing from 1.0 to 1.7, the grain size increased from 35 to 118 nm accordingly, resulting in the obvious changes of the photoluminescence properties. Concentration dependence of the emission intensity revealed that the quenching concentration of europium dopant was around 5 mol% for G/N- 1.7. The intensity of the peak emission due to the 5D0 → 7F2 transition of the Eu3+ ions dropped as the grain size decreased. The charge transfer band position of Eu3+-doped lutetia phosphors shifted toward lower energy (red shift) with the reduction of crystallite sizes and also with the increase of Eu3+ concentrations.

Download Full-text

Metal-to-metal charge transfer band position control and luminescence quenching by cationic substitution in NaNbO3:Pr3+

10.1117/12.2253177 ◽

2017 ◽

Cited By ~ 2

Author(s):

V. Castaing ◽

L. Li ◽

D. Rytz ◽

Y. Katayama ◽

A. D. Sontakke ◽

...

Keyword(s):

Charge Transfer ◽

Position Control ◽

Charge Transfer Band ◽

Luminescence Quenching ◽

Metal Charge ◽

Band Position ◽

Cationic Substitution ◽

Metal Charge Transfer

Download Full-text

Photoluminescence behavior of Al3+, Pr3+ doped perovskite La2/3TiO3 and pyrochlore La2Ti2O7

Journal of Materials Research ◽

10.1557/jmr.2001.0352 ◽

2001 ◽

Vol 16 (9) ◽

pp. 2568-2571 ◽

Cited By ~ 23

Author(s):

J. K. Park ◽

C. H. Kim ◽

K. J. Choi ◽

H. D. Park ◽

S. Y. Choi

Keyword(s):

Energy Transfer ◽

Charge Transfer ◽

Charge Transfer Band ◽

Critical Distance ◽

Photoluminescence Properties ◽

Red Emission ◽

Pyrochlore Type ◽

Perovskite Type ◽

Photoluminescence Behavior

The purpose of this study is to develop an understanding of the photoluminescence properties of Al3+, Pr3+ doped perovskite-type La2/3TiO3 and pyrochlore-type La2Ti2O7 phosphor, which is characterized by the red emission (1D2 →3H4 transition) of the Pr3+ ion. The explanation for the energy transfer and the corresponding critical distance is proposed on the basis of the role of Al3+ ions in the perovskite-type La2/3TiO3:Pr phosphor. To clarify the distinction of photoluminescence properties between the perovskite-type La2/3TiO3 and the pyrochlore-type La2Ti2O7, the trap-involved process and the charge transfer band have been investigated, respectively.

Download Full-text

A SERS Study of Charge Transfer Process in Au Nanorod–MBA@Cu2O Assemblies: Effect of Length to Diameter Ratio of Au Nanorods

Nanomaterials ◽

10.3390/nano11040867 ◽

2021 ◽

Vol 11 (4) ◽

pp. 867

Author(s):

Lin Guo ◽

Zhu Mao ◽

Sila Jin ◽

Lin Zhu ◽

Junqi Zhao ◽

...

Keyword(s):

Charge Transfer ◽

Shell Structure ◽

Shell Structures ◽

Core Shell ◽

Absorption Bands ◽

Au Nanorods ◽

The Core ◽

Band Position ◽

Surface Enhanced Raman ◽

Core Shell Structure

Surface-enhanced Raman scattering (SERS) is a powerful tool in charge transfer (CT) process research. By analyzing the relative intensity of the characteristic bands in the bridging molecules, one can obtain detailed information about the CT between two materials. Herein, we synthesized a series of Au nanorods (NRs) with different length-to-diameter ratios (L/Ds) and used these Au NRs to prepare a series of core–shell structures with the same Cu2O thicknesses to form Au NR–4-mercaptobenzoic acid (MBA)@Cu2O core–shell structures. Surface plasmon resonance (SPR) absorption bands were adjusted by tuning the L/Ds of Au NR cores in these assemblies. SERS spectra of the core-shell structure were obtained under 633 and 785 nm laser excitations, and on the basis of the differences in the relative band strengths of these SERS spectra detected with the as-synthesized assemblies, we calculated the CT degree of the core–shell structure. We explored whether the Cu2O conduction band and valence band position and the SPR absorption band position together affect the CT process in the core–shell structure. In this work, we found that the specific surface area of the Au NRs could influence the CT process in Au NR–MBA@Cu2O core–shell structures, which has rarely been discussed before.

Download Full-text