Anovel red emitting phosphor α-Gd

2

(MoO

4

)

3

:Eu

3+

was prepared by solid-state reaction

using the NH

4

Fas the flux.The effects of flux content and concentration of activator on the crystal structure

mor-phology and luminescent properties were investigated by using XRD

SEM

and fluorescent spectra.The XRD patterns showed that the resultants have the monoclinic phase

and with the increase of the flux amount the crystallization could be improved greatly.The SEM images indicate that the morphology of the phosphor particle is close to ball-like

and thier mean size is around 2 μm.It is also observed that higher flux amount could result in agglomeration of phosphor particles.These results suggest that proper amount of flux should be around 3%.The excitation spectra show effective absorption wavelengths at ultraviolet (UV) (395 nm) and blue (465 nm) corresponding to the f-f transition of Eu

3+

.These wavelengths coincide with the wavelengths of commercial GdN based LED

so that the phosphor may be a better candidate for red component for white LED.The emission spectra exhibit most intense emission at 613 nm

which is assigned to the

5

D

0

→

7

F

2

transition.The intense electric dipole transition implies that the Eu

3+

occupies non-centrosymmetric sites in the matrix.The dependence of emission intensity on the flux was investigated.The better choice for introducing flux was confirmed to be at 3%

which is in a good agreement with the result derived from the XRD and SEM.Higher quenching concentration was showed to be 40% by studying the dependence of luminescent intensity on the Eu

3+

concentration.