Banca de QUALIFICAÇÃO: LAURA XIMENA LOVISA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : LAURA XIMENA LOVISA
DATA : 02/10/2017
HORA: 10:00
LOCAL: Auditório do CCET
TÍTULO:

Photoluminescence properties of (Eu, Tb, Tm) co-doped ZnMoO4 obtained by sonochemical method

PALAVRAS-CHAVES:

ZnMoO4: Tm3+ - Tb3+ - Eu3+, Sonochemistry, Photoluminescence

PÁGINAS: 70
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

A new class of inorganic materials, which emerge as a promising option in high-performance applications in the field of photoluminescence, has received special attention. This group consists of the molybdates, XMoO4 (X: metal), doped with rare earth elements (RE). The characteristics that describe these materials are: high luminous efficiency, long decay time and emission presentation in the visible. In this work ZnMoO4 particles were synthesized and the series ZnMoO4: 1% Tb3+, 1% Tm3+, x Eu3+ (x = 1, 1.5, 2, 2.5 e 3 mol%) obtained by sonochemical method. The influence of dopant content on photoluminescent behavior was investigated. The X-ray diffraction results confirmed the formation of the α-ZnMoO4 phase with triclinic crystalline structure for the particles. The values of the gap energy are in the range of 3.55 and 4.25 eV. The SEM images show an evolution of the particle morphology in accordance with the increase in doping. The results of photoluminescence clearly show the specific emissions of Tm3+, Tb3+ and Eu3+, simultaneously, with a strong contribution of the matrix. The samples showed emission in the orange region according to the values of the calculated chromaticity coordinates.

MEMBROS DA BANCA:
Presidente - 1802888 - FABIANA VILLELA DA MOTTA
Externo ao Programa - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Interno - 1883170 - MAURICIO ROBERTO BOMIO DELMONTE