Blue emission of Ce3+ in lanthanide silicon oxynitride phosphors

2007 ◽  
Vol 22 (7) ◽  
pp. 1933-1941 ◽  
Author(s):  
Benjamin Dierre ◽  
Rong-Jun Xie ◽  
Naoto Hirosaki ◽  
T. Sekiguchi
Keyword(s):  
Diffuse Reflection ◽  
Blue Emission ◽  
Thermal Quenching ◽  
Nitrogen Atmosphere ◽  
Diffuse Reflection Spectrum ◽  
Concentration Quenching ◽  
Silicon Oxynitride ◽  
Photoluminescence Spectra ◽  
Temperature Dependent ◽  
Silicon Oxynitrides

Ce3+-activated lanthanide silicon oxynitride (La5Si3O12N, La4SiO7N2, LaSiO2N, and La3Si8O4N11) phosphors were prepared by firing the mixture of La2O3, Si3N4, SiO2, and CeO2 at 1500–1600 °C under a 0.5 MPa nitrogen atmosphere. Diffuse reflection spectrum, photoluminescence spectra, and temperature-dependent luminescence of these phosphors are presented in this work. A blue emission of Ce3+ in all lanthanide silicon oxynitrides was observed under ultraviolet irradiation, which is strongest in La3Si8O4N11:Ce3+. The concentration quenching and thermal quenching of the samples were discussed.

Temperature-Dependent Photoluminescence Spectra of PbSe Quantum Dots for Temperature Markers

2012 ◽  
Vol 482-484 ◽  
pp. 2547-2550
Author(s):  
Peng Fei Gu ◽  
Ya Nan Wang ◽  
Jia Jia Cao ◽  
Yu Yan ◽  
Tie Qiang Zhang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Temperature Sensitivity ◽  
Peak Position ◽  
Strong Temperature Dependence ◽  
Photoluminescence Spectra ◽  
Temperature Dependent ◽  
Temperature Variations ◽  
Temperature Changes ◽  
Optical Readout ◽  
Temperature Dependent Photoluminescence

We here report the temperature effect on photoluminescence(PL) spectra of PbSe quantum dots (QDs), which exhibit a strong temperature dependence on their spectra position and intensity. They potentially act as the temperature marker, sensing temperature variations and reporting temperature changes remotely through optical readout. In addition, the temperature sensitivity characterized by peak position of PbSe QDs was found to be 0.39nm/°C in a range of 10-100 °C.

Synthesis and Characterization of Lightweight Beryllium Chloro Silicate Phosphor

2022 ◽  
pp. 89-100
Author(s):  
Khushbu Sharma
Keyword(s):  
Blue Emission ◽  
Emission Peak ◽  
Excitation Band ◽  
Photoluminescence Spectra ◽  
Strong Emission ◽  
White Leds ◽  
Long Afterglow ◽  
Silicate Phosphor ◽  
Low Weight

In this chapter, low weight barium-based cholorsilicate Ba5Cl6Si2O6:Eu2+ is prepared through a solid-state reaction. To confirm the structure of the synthesized phosphors, powder photographs were obtained using an x-ray diffractometer. Photoluminescence spectra and FTIR spectra were recorded. Photoluminescence spectra are studied. The emission peak is observed at 407 nm at excitation 275 nm. The intense violet-blue emission is obtained. The broad excitation band and strong emission indicate that Ba5Cl6Si2O6:Eu2+could be a good phosphor candidate for blue LED and white LEDs. Decay curve indicates the phosphor has a long afterglow feature.

Temperature-dependent ultraviolet photoluminescence in hierarchical Zn, ZnO and ZnO/Zn nanostructures

Nanoscale ◽  
2019 ◽  
Vol 11 (28) ◽  
pp. 13385-13396 ◽  
Author(s):  
Han-Sheng Chou ◽  
Kai-Di Yang ◽  
Sheng-Hong Xiao ◽  
Ranjit A. Patil ◽  
Chien-Chih Lai ◽  
...  
Keyword(s):  
Thermal Quenching ◽  
Two Dimensional ◽  
Zno Nanostructures ◽  
Temperature Dependent ◽  
Photoluminescence Enhancement

The temperature-dependent effects on the ultraviolet photoluminescence enhancement, blueshift, thermal quenching of the two-dimensional Zn nanosheets, 2D-hierarchical ZnO nanostructures, and 2D-hierarchical ZnO/Zn nanostructures are presented.

A narrow-band blue emitting phosphor Ca8Mg7Si9N22:Eu2+ for pc-LEDs

2019 ◽  
Vol 7 (13) ◽  
pp. 3730-3734 ◽  
Author(s):  
Chao Li ◽  
Xiao-Ming Wang ◽  
Feng-Feng Chi ◽  
Zu-Pei Yang ◽  
Huan Jiao
Keyword(s):  
Emission Intensity ◽  
Room Temperature ◽  
Narrow Band ◽  
Blue Emission ◽  
Thermal Quenching ◽  
Unit Cell ◽  
Photoluminescence Emission ◽  
Space Group

Ca8Mg7Si9N22 crystallizes in a tetragonal space group P42/nmc (No. 137) with a unit cell of a = 7.3271(11) Å and c = 10.336(2) Å. Ca8Mg7Si9N22:Eu2+ shows a narrow-band blue emission peaking at 400 nm with an intriguing bandwidth ∼34 nm and shows remarkably high thermal quenching resistance, maintaining 92% photoluminescence emission intensity at 420 K and 75% at 700 K of that measured at room temperature.

scholarly journals Enhancing Blue Emission in Ce Doped Silicon Oxynitrides Based Electroluminescent Devices

2019 ◽  
Vol 8 (12) ◽  
pp. R157-R163
Author(s):  
F. Ehré ◽  
C. Dufour ◽  
O. Blázquez ◽  
B. Garrido ◽  
W. M. Jadwisienczak ◽  
...  
Keyword(s):  
Blue Emission ◽  
Electroluminescent Devices ◽  
Doped Silicon ◽  
Silicon Oxynitrides

Fabrication of Silicon Carbide from Rice Husk by Carbothermal-Reduction and In Situ Reaction Bonding Technique

2014 ◽  
Vol 608 ◽  
pp. 235-240 ◽  
Author(s):  
Chalermkwan Makornpan ◽  
Charusporn Mongkolkachit ◽  
Suda Wanakitti ◽  
Thanakorn Wasanapiarnpong
Keyword(s):  
Silicon Carbide ◽  
Rice Husk ◽  
Carbothermal Reduction ◽  
Nitrogen Atmosphere ◽  
Silicon Oxynitride ◽  
Reaction Bonding ◽  
Silicon Carbide Particle ◽  
Silicon Carbide Whisker ◽  
Sic Ceramics

Silicon carbide (SiC) ceramics were prepared by carbothermal reduction together with in-situ reaction bonding. Raw rice husk was carbonized in an incineration furnace. The carbonized rice husk was ground and was then treated with hydrochloric acid by varying concentrations. The sample powders were mixed with silicon metal powder and pyrolyzed at various temperatures in either argon or nitrogen atmosphere. Silicon carbide phase was found in all pyrolyzed samples. Cristobalite was found in argon atmosphere pyrolyzed samples while silicon oxynitride was found in the samples pyrolyzed in nitrogen atmosphere at lower than 1500 °C. Silicon carbide whisker is the main phase on the surface of pyrolyzed sample. Increasing pyrolysis temperatures decreased the amount and size of silicon carbide whisker but increased the silicon carbide particle. Porosity and weight loss of samples after pyrolysis were increased with increasing temperatures due to the reaction in the system.

Novel La3GaGe5O16 : Mn4+based deep red phosphor: a potential color converter for warm white light

RSC Advances ◽  
2015 ◽  
Vol 5 (110) ◽  
pp. 90499-90507 ◽  
Author(s):  
Shaoan Zhang ◽  
Yihua Hu ◽  
He Duan ◽  
Li Chen ◽  
Yinrong Fu ◽  
...  
Keyword(s):  
Activation Energy ◽  
White Light ◽  
Thermal Quenching ◽  
Temperature Dependent ◽  
Quenching Temperature ◽  
Red Phosphor ◽  
Warm White Light ◽  
Relative Emission Intensity ◽  
Insight Into ◽  
Color Converter

We gained insight into the temperature-dependent relative emission intensity of La3GaGe5O16: Mn4+phosphor, and the luminescence quenching temperature and the activation energy for thermal quenching (ΔE) were obtained.

Combustion Synthesis and Luminescent Properties of Eu3+ and Dy3+ Co-Doped Amorphous SrAl2O4

2013 ◽  
Vol 538 ◽  
pp. 58-62 ◽  
Author(s):  
Bao Gai Zhai ◽  
Qing Lan Ma ◽  
Yuan Ming Huang
Keyword(s):  
Blue Emission ◽  
Luminescent Properties ◽  
Yellow Emission ◽  
Photoluminescence Spectra ◽  
Solution Combustion ◽  
X Ray ◽  
Emission Color ◽  
Blue Background ◽  
Good Environment ◽  
Co Doped

Trivalent Eu and Dy ions co-doped amorphous strontium aluminate oxide (SrAl2O4:Eu3+Dy3+) were synthesized through solution combustion route. The phase of the synthesized compound was examined with the X-ray diffractometry. The photoluminescence spectra of the amorphous SrAl2O4:Eu3+Dy3+ has shown that the sharp blue emission of Dy3+ at 483 nm, the sharp yellow emission of Dy3+ at 570 nm and the sharp red emission of Eu3+ at 615 nm can be integrated into the broad blue background emission of the amorphous host. The results indicate that the amorphous SrAl2O4 host can provide good environment to tune the emission color for the SrAl2O4:Eu3+Dy3+.

Characteristic analysis of temperature-dependent photocurrent and photoluminescence spectra in as-implanted p-ZnO crystals

2013 ◽  
Vol 63 (9) ◽  
pp. 1777-1783
Author(s):  
T. S. Jeong ◽  
J. H. Yu ◽  
H. J. Yang ◽  
H. S. Mo ◽  
T. S. Kim ◽  
...  
Keyword(s):  
Photoluminescence Spectra ◽  
Characteristic Analysis ◽  
Temperature Dependent

Structural and Optical Properties of TiO2 Nanoarray Films Prepared by Liquid Phase Deposition

2012 ◽  
Vol 512-515 ◽  
pp. 364-367
Author(s):  
Xiao Qiang Wang ◽  
Meng Wang ◽  
Jian Min Wang ◽  
Chun Lei Zha ◽  
Cong Mian Zhen
Keyword(s):  
Liquid Phase ◽  
Surface Morphology ◽  
Reflection Spectrum ◽  
Diffuse Reflection ◽  
Heat Treating ◽  
Diffuse Reflection Spectrum ◽  
Growth Time ◽  
Anodized Aluminum ◽  
Nanotube Array ◽  
Shift Effect

In this thesis, highly ordered TiO2 nanotube array films were fabricated via liquid phase depostition (LPD) method, based on different anodized aluminum (AAO) templates. The surface morphology, structure and diffuse reflection spectrum were analyzed by XRD, SEM, UV diffuse reflection spectrum. The results show that the crystal structure of the TiO2 nano array was anatase after heat-treating at 400 °C. SEM photographs show that nanobube arrays have an average diamieter of 50~80nm, the surface morphology is flat, and the tublar structure is not violated after heat-treating. As the growth times increased, red-shift effect was abserved in diffuse reflection spectra. And the optical band gap is respectively 1.48ev, 1.70ev and 2.08ev as the growth time is 10mins, 20 mins and 30mins.

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