Luminescent properties of MAl(SO4)2 Br:Eu(3+) (M = Sr or Mg) red phosphors for near-UV light-emitting diodes.
Eu(3+) -activated MAl(SO4 )2 Br phosphors (where M = Mg or Sr) are successfully prepared using a wet chemical reaction technique. The samples are characterized by X-ray diffraction (XRD) and photoluminescence (PL) spectroscopies. The XRD pattern revealed that both the samples are microcrystalline in nature. PL of Eu(3+) -doped SrAl(SO4 )2 Br and MgAl(SO4 )2 Br phosphors exhibited characteristic red emission coming from the (5) D0  → (7) F2 (616 nm) electron transition, when excited by 396 nm wavelength of light. The maximum intensity of luminescence was observed at a concentration of 1 mol% Eu(3+) . The intensity of the electric dipole transition at 616 nm is greater than that of the magnetic dipole transition at 594 nm. The results showed that MAl(SO4 )2 Br:Eu(3+) , (M = Mg, Sr) phosphors have potential application in near-UV light-emitting diodes as efficient red-emitting phosphor.
Department of Physics, R. T. M. Nagpur University, Nagpur, 440033, India.
Priti B
PB
Deshmukh
S P
SP
Puppalwar
N S
NS
Dhoble
S J
SJ
Dhoble
D000534:Alum Compounds / Q000737:chemistry*; D005063:Europium / Q000737:chemistry; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D014466:Ultraviolet Rays
D000534:Alum Compounds; D049408:Luminescent Agents; D005063:Europium
MAl(SO4)2Br (M = Mg or Sr); chemical synthesis; light-emitting diode; phosphor; photoluminescence