Spectroscopic behavior, thermal stability and temperature sensitivity of Ca 2 SiO 4 : Eu 3+ red emitting phosphor for solid state lighting application
| Autor: | Dhananjay Kumar Singh, Kanchan Mondal, J. Manam |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Mechanical Engineering Metals and Alloys Analytical chemistry Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Emission intensity 0104 chemical sciences law.invention Field emission microscopy Solid-state lighting Mechanics of Materials law Materials Chemistry Orthorhombic crystal system Thermal stability Emission spectrum Chromaticity 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 761:41-51 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2018.05.161 |
| Popis: | This paper reports the spectroscopic behavior, thermal stability and temperature sensitivity of Ca2SiO4: Eu3+ phosphors. A series of Ca2SiO4: Eu3+ phosphors were synthesized by using an efficient combustion method. The X-ray diffraction (XRD) results showed that the prepared phosphors consist of a single phase orthorhombic structure. The field emission scanning electron microscope (FESEM) results showed irregular and agglomeration of particles. Under the excitation wavelength 255 nm, the PL emission showed five peaks at the wavelengths 574, 594, 612, 656 and 707 nm corresponds to the transitions 5D0→7F0, 5D0→7F1, 5D0→7F2, 5D0→7F3, and 5D0→7F4 respectively. The concentration quenching phenomenon was ascribed to dipole-dipole interaction. The intensity and spectral parameters for different J levels were estimated using the Judd-Ofelt theory. The prepared phosphor has retained the emission intensity about 70% at 475 K. The CIE chromaticity coordinates (x, y) were calculated from emission spectra and found to be in the red region. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect