"Babes-Bolyai" University

"Raluca Ripan" Institute for Research in Chemistry

NANOPHOSPHORS BASED ON YTTRIUM SILICATE FOR OPTOELECTRONICS


STAGE 4

Objective 1
Preparation of some rare erath modified silicates (M-YSO)


Objective 2
Phisico-chemical aspects regarding the formation of YSO phosphors


Objective 3
Increasing the national and international visibility
-*patent registration.



Results and discussion:
* Effect of silicon source:


Samples with variable amount of gadolinium were prepared by combustion with general formula Y2-xGdxSiO5:0.75Ce,1.75Tb

>> The emission color of YSO:Ce phosphors depend on the excitation radiation:
-under 356 nm the phosphors exhibit a bright blue-white color
-under 254 nm the phosphors exhibit a white-yelow green color.

>> The bands at 400 and 418 nm are from electron transitions from 5d level to the ground state levels (2F5/2, 2F7/2) in Ce3+.
>> The bands at 486 nm, 498 nm, 544 nm and 548 nm are from electron transitions from 5DJ level to the ground state levels 7Fj in Tb3+.

RESULTS AND DISSEMINATION Dissemination - Stage 4 (2016)

Published papers:

1) Tunable Luminescence of Broadband-Excited and narrow line green emitting Y2SiO5:Ce3+, Tb3+ Phosphor L.E. Muresan, Y. Karabulut , A.I Cadis, I. Perhaita, J. Garcia Guinea, L. Barbu Tudoran, D. Silipas, A. Canimoglu, M. Ayvacikli, N. Can, Journal of Alloys and Compounds , 658 (2016) 356-366 (ISI=2.999, 2014)

2) Optical spectroscopy of the Ce-dopedmulti component garnets A.Canimoglu, Y.Karabulut, M.Ayvacikli, L.E.Muresan, I.Perhaita, L.Barbu-Tudoran, J. GarciaGuinea, T.Karali, N.Can, Applied Radiation and Isotopes, 114 (2016) 114120 ( ISI= 1.136, 2016)

Patent registration

Title: PROCESS FOR PREPARATION OF SOME LUMINESCENT PIGMENTS BASED ON YTTRIUM SILICATE DOPED WITH RARE EARTH WITH TUNABLE LUMINESCENCE