Intense blue-emitting Ca5Al8O14: Eu phosphor for mercury free lamp |
| |
Authors: | Abhay D Deshmukh S J Dhoble S V Godbole M K Bhide and D R Peshwe |
| |
Institution: | (1) Kamla Nehru College, Sakkardara Square, Nagpur, 440 009, Maharashtra, India;(2) Spectroscopy Section, Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India;(3) Department of Metallurgical and Materials Engineering, VNIT, Nagpur, 440 011, Maharashtra, India |
| |
Abstract: | The calcium aluminates doped with Eu ions, Ca5Al8O14: Eu, phosphors are prepared by the combustion method. The formation of crystalline aluminates was confirmed by X-ray diffraction
pattern. The prepared phosphors were characterized by SEM, TGA, DTA, particle size analyzer and Photoluminescence (PL) techniques.
From the UV-excited luminescence spectra it was found that the Eu ions acts as a luminescent centre with luminescence at the
blue (λ
max = 470 nm) region due to 4f
65d
1 → 4f
7 transition. The excitation spectra show the broad band at 355 nm wavelength (λ
em = 470 nm). The excitation 355 nm is a mercury free excitation and therefore Ca5Al8O14: Eu may be useful for the solid state lighting phosphor in lamp industry.
|
| |
Keywords: | Ca5Al8O14 PL phosphor noncentrosymmetric |
本文献已被 SpringerLink 等数据库收录! |
|