Effect of dopant concentration on photoluminescence properties of Gd[sub 2]O[sub 3]:Eu[sup 3+]

2013 ◽  
Author(s):  
T. Selvalakshmi ◽  
A. Chandra Bose
Keyword(s):  
Dopant Concentration ◽  
Photoluminescence Properties

Synthesis and Photoluminescence of Rhombic NaLa(MoO4)2:Ln3+ Nanocrystals

2016 ◽  
Vol 16 (4) ◽  
pp. 3617-3621 ◽  
Author(s):  
Yuping Wang ◽  
Mingxia Li ◽  
Kai Pan ◽  
Rong Li ◽  
Naiying Fan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Luminescence Intensity ◽  
Dopant Concentration ◽  
Emission Spectra ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Rhombic NaLa(MoO4)2:Ln3+ (Ln = Eu and Tb) nanocrystals were synthesized by a hydrothermal method. The structures and morphologies of the nanocrystals were characterized by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy. The results indicated that the crystalline size increased with increasing Na2MoO4 content. The photoluminescence properties of NaLa(MoO4)2:Ln3+ nanocrystals were investigated in detail. In the emission spectra of NaLa(MoO4)2:Eu3+ nanocrystals, the 5D0 → 7F2 is dominant, and the peak positions and spectral shapes of emissions were independent of Eu3+ concentration. The luminescence intensity increased with increasing Eu3+ concentration, up to about 10 mol%, and then decreased. In the emission spectra of NaLa(MoO4)2:Tb3+ nanocrystals, the 5D4 → 7F5 is dominant. The sample with a dopant concentration of 20 mol% showed the highest emission intensity.

Preparation and Luminescent Properties of Sm3+-Doped High Thermal Stable Sodium Yttrium Orthosilicate Phosphor

2016 ◽  
Vol 16 (4) ◽  
pp. 3500-3505 ◽  
Author(s):  
Na Xue ◽  
Zhoufei Hei ◽  
Ze Zhao ◽  
Jing Wang ◽  
Ting Wang ◽  
...  
Keyword(s):  
Dopant Concentration ◽  
Red Light ◽  
Thermal Quenching ◽  
Luminescent Properties ◽  
Photoluminescence Properties ◽  
Quenching Temperature ◽  
Light Emitting ◽  
Red Phosphors ◽  
Bright Orange ◽  
White Light Emitting Diodes

Orange-red-emitting sodium yttrium orthosilicate NaYSiO4:xSm3+ (x = 0.005, 0.01, 0.02, 0.05, 0.10, 0.15, and 0.20) were synthesized. The phase structure and photoluminescence properties of these phosphors were investigated. The emission spectrum obtained by excitation into 406 nm contains exclusively the characteristic emissions of Sm3+ at 571 nm, 602 nm, 648 nm, and 710 nm, which correspond to the transitions from 4G5/2 to 6H5/2, 6H7/2, 6H9/2, and 6H11/2 of Sm3+, respectively. The strongest one is located at 602 nm due to the 4G5/2 → 6H7/2 transition of Sm3+, generating bright orange–red light. The optimum dopant concentration of Sm3+ ions in NaYSiO4:xSm3+ is around 2 mol%, and the critical transfer distance of Sm3+ is calculated as 23 Å. The thermal quenching temperature is above 500 K. The fluorescence lifetime of Sm3+ in NaYSiO4:0.02Sm3+ is 1.83 ms. The NaYSiO4:Sm3+ phosphors may be potentially used as red phosphors for white light emitting diodes.

Chromophore Doped Glasses as Scintillator Materials

1994 ◽  
Vol 348 ◽  
Author(s):  
C. Smith ◽  
N. F. Borrelli ◽  
P. A. Tick ◽  
D. Smith ◽  
M. J. Weber ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Organic Molecules ◽  
Dopant Concentration ◽  
Chemical Durability ◽  
Photoluminescence Properties ◽  
Efficient Energy Transfer ◽  
Efficient Energy ◽  
Doped Glasses ◽  
Doped Glass ◽  
Weak Luminescence

ABSTRACTA family of low melting temperature tin fluorophosphate glasses that can incorporate certain organic compounds has been under investigation. The glasses are comprised principally of SnF2, SnO, and P2O5; the addition of small amounts (< 5%) of Pb improves chemical durability. These materials are dense, reasonably water durable, and easily fabricated. Photoluminescence properties of glasses doped with pyrene, POPOP, stilbene 420 and several other organic molecules were studied. All of the doped glasses exhibited intense photoluminescence. Pyrene doped glass was found to have monomer-triplet and dimer-excimer pyrene species present, depending on the dopant concentration. Scintillation properties of the glasses were also investigated. Generally a very fast (~1 ns or less) but weak luminescence was observed. Results of these studies suggest that higher concentrations of the dyes must be incorporated into the glass and more efficient energy transfer from the glass host to the organic fluor must be attained for these materials to be useful as fast scintillators.

Photoluminescence properties and effects of dopant concentration in Bi2ZnB2O7:Tb3+ phosphor

Optik ◽  
2014 ◽  
Vol 125 (15) ◽  
pp. 4098-4101 ◽  
Author(s):  
Ertuğrul Erdoğmuş ◽  
Esra Korkmaz
Keyword(s):  
Dopant Concentration ◽  
Photoluminescence Properties

Effects of Na+ on Spectral Properties of Er3+: CaF2 Transparent Ceramic

2012 ◽  
Vol 531-532 ◽  
pp. 307-311
Author(s):  
Wei Wei Li ◽  
Bing Chu Mei ◽  
Xiaonv Li ◽  
Jing Hong Song ◽  
Guang Lin Zhi
Keyword(s):  
Spectral Properties ◽  
Room Temperature ◽  
Dopant Concentration ◽  
Emission Spectra ◽  
Transparent Ceramic ◽  
Transparent Ceramics ◽  
Photoluminescence Properties ◽  
Pressing Method ◽  
Co Doping ◽  
Optimal Value

Er3+, Na+-co-doped CaF2 transparent ceramics with Er3+ dopant concentration of 5at% and Na+ of 0, 0.5, 1.0 and 1.5at% were fabricated by the vacuum hot pressing method. Absorption spectra, emission spectra and fluorescence lifetimes were measured at room temperature to study the effects of Na+ on the spectral properties of Er3+: CaF2 transparent ceramic. The results showed that after introducing Na ion into Er3+: CaF2 transparent ceramics, charge-neutralized Er3+-Na+ structure formed which prevented Er3+ from clustering, the absorption intensity of ceramics decreased with the increase of Na+ concentration, but the spectroscopy and photoluminescence properties of Er3+ in CaF2 transparent ceramic could be modulated by adjusting the concentration of Na+. Co-doping Na+ to increase fluorescence lifetime should have an optimal value.

Dimensionally-Controlled Hydrothermal Tm3+-doped Oxidic Nanocrystals and Their Photoluminescence Properties

2010 ◽  
Vol 1247 ◽  
Author(s):  
Rocío Calderón-Villajos ◽  
Carlos Zaldo ◽  
Concepción Cascales
Keyword(s):  
Single Crystals ◽  
Fluorescence Lifetimes ◽  
Photoluminescence Properties ◽  
Reaction Conditions ◽  
Hydrothermal Processes ◽  
Bulk Single Crystals ◽  
Template Free ◽  
Reaction Media

AbstractControlled reaction conditions in simple, template-free hydrothermal processes yield Tm-Lu2O3 and Tm-GdVO4 nanocrystals with well-defined specific morphologies and sizes. In both oxide families, nanocrystals prepared at pH 7 reaction media exhibit photoluminescence in ∼1.95 μm similar to bulk single crystals. For the lowest Tm3+ concentration (0.2 % mol) in GdVO4 measured 3H4 and 3F4 fluorescence lifetimes τ are very near to τrad.

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