Photoluminescence of ZnO:Eu3+ Nanoflowers

2008 ◽  
Vol 8 (3) ◽  
pp. 1307-1311 ◽  
Author(s):  
Peter A. Tanner ◽  
Lixin Yu
Keyword(s):  
Low Temperature ◽  
Conduction Band ◽  
Selective Excitation ◽  
Ftir Spectra ◽  
Photoluminescence Spectra ◽  
Defect States ◽  
Hydrothermal Route ◽  
Broadband Emission ◽  
The Eu

The synthesis of ZnO:Eu3+ nanoflowers by a low-temperature hydrothermal route is described. Characterization of the materials was performed by ESEM, XRD and FTIR spectra. The 355 nm excited photoluminescence spectra at 10 K do not indicate the presence of Eu2+ or the ZnO defect states which give rise to green or red broadband emission. Excitation into the ZnO conduction band at low temperature does not give emission from Eu3+. Selective excitation of the Eu3+ emission shows that Eu3+ ions occupy a variety of different sites, of which one of them is similar to Eu3+ in C-type Eu2O3.

The Visible and the Infrared Luminescence Bands as a Tool for Characterization of the Porous Silicon Bandstructure

1994 ◽  
Vol 358 ◽  
Author(s):  
V. Petrova-Koch ◽  
T. Muschik ◽  
G. Polisski ◽  
D. Kovalev
Keyword(s):  
Porous Silicon ◽  
Low Temperature ◽  
Valence Band ◽  
Conduction Band ◽  
Porous Si ◽  
Surface Degradation ◽  
Infrared Luminescence

ABSTRACTThe visible and the infrared photoluminescence bands in porous Si have been studied at low temperature for two series of samples: one in which the size of the crystallites has been varied and another in which the degree of surface degradation has been changed. It is shown that the relation of the two bands can be explored for characterization of the porous Si bandstructure. The size- and the surface dependence of the valence band and of the conduction band related states is discussed. A model is proposed for explanation.

scholarly journals Room temperature synthesis and characterization of novel lead-free double perovskite nanocrystals with a stable and broadband emission

2021 ◽  
Vol 9 (1) ◽  
pp. 158-163
Author(s):  
Yingying Tang ◽  
Leyre Gomez ◽  
Marco van der Laan ◽  
Dolf Timmerman ◽  
Victor Sebastian ◽  
...  
Keyword(s):  
Activation Energy ◽  
Low Temperature ◽  
Room Temperature ◽  
Double Perovskite ◽  
Lead Free ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
Perovskite Nanocrystals ◽  
Broadband Emission

We demonstrated the synthesis of ultra small and stable Cs3BiBr6 nanocrystals, ∼1.5–3 nm, via a room-temperature antisolvent method. Red-shift of bandgap was observed in low temperature PL measurements with an activation energy of ∼41 meV.

Facial hydrothermal route of graphene and titanium dioxide nanotube composite with enhanced green light emission at ~ 530 nm

2018 ◽  
Vol 34 (2) ◽  
Author(s):  
Sang Nguyen Xuan
Keyword(s):  
Titanium Dioxide ◽  
Light Emission ◽  
Green Light ◽  
Green Emission ◽  
Excited Electron ◽  
Photoluminescence Spectra ◽  
Defect States ◽  
Hydrothermal Route ◽  
Trap Hole ◽  
Green Light Emission

Herein we report a simple fabrication of graphene and titanium dioxide nanotube composite using hydrothermal method. Photoluminescence emission of the composite were investigated to study defect states in bandgap of nanotubes when the content of graphene varied from 1 wt% to 8 wt%. With the content of graphene lower than 5 wt%, the photoluminescence spectra form of the composite showed similar to that of pristine titanium dioxide nanotube. When the content of graphene reached 8 wt%, the emission positions were unchanged. However the spectrum form was dramatically changed, the intensity of green emission at about 530 nm was dominated. Thanks to the formation of graphene and titanium dioxide nanotube, excited electron was easy to diffuse from nanotube to graphene. The recombination of excited electron and trap hole on nanotube surface induced by oxygen vacancy in titanium dioxide anatas phase was enhanced which was attributed to the 530 nm emission.

scholarly journals Thermal stability, electrochemical and structural characterization of hydrothermally synthesised cobalt ferrite (CoFe2O4)

RSC Advances ◽  
2019 ◽  
Vol 9 (57) ◽  
pp. 33282-33289 ◽  
Author(s):  
Michele Bastianello ◽  
Silvia Gross ◽  
Matthias T. Elm
Keyword(s):  
Thermal Stability ◽  
Low Temperature ◽  
Structural Characterization ◽  
High Purity ◽  
Cobalt Ferrite ◽  
Hazardous Chemicals ◽  
Hydrothermal Route ◽  
Nano Crystalline

Monophasic nano-crystalline CoFe2O4 (CFO) nanoparticles of high purity have been synthesised through a low temperature hydrothermal route, which does not involve hazardous chemicals, or conditions.

Characterization of Low Temperature SiNx Films for 3D/2.5D-IC TSV

2015 ◽  
Vol 135 (7) ◽  
pp. 733-738 ◽  
Author(s):  
Yasushi Kobayashi ◽  
Yoshihiro Nakata ◽  
Tomoji Nakamura ◽  
Mayumi B. Takeyama ◽  
Masaru Sato ◽  
...  
Keyword(s):  
Low Temperature
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