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 (λmax = 470 nm) region due to 4f 65d1 → 4f 7 transition. The excitation
spectra show the broad band at 355 nm wavelength (λem = 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.Intense blue-emitting Ca5Al8O14 : Eu phosphor for mercury free lamp
Abhay D Deshmukh1*, S J Dhoble1, S V Godbole2, M K Bhide2 and D R Peshwe3
1Kamla Nehru College, Sakkardara Square, Nagpur-440 009, Maharashtra, India
2Spectroscopy Section, Radiochemistry Division, Bhabha Atomic Research Centre,
Mumbai-400 085, India
3Department of Metallurgical and Materials Engineering, VNIT, Nagpur-440 011,
Maharashtra, India
E-mail : [email protected] Nehru College, Sakkardara Square, Nagpur-440 009, Maharashtra, India
2Spectroscopy Section, Radiochemistry Division, Bhabha Atomic Research Centre,
Mumbai-400 085, India
3Department of Metallurgical and Materials Engineering, VNIT, Nagpur-440 011,
Maharashtra, Indi
