Abstracts Book - IMRC 2018

• SA6-P131
ENHANCED LUMINESCENCE PROPERTIES OF ZnGa2O4:Cr3+
NANOPARTICLES
Marcos Tapia Montalvo 1 , Ana Leticia Fernández Osorio 2 , Julian Chávez Fernández 2
1 Universidad Nacional Autónoma de México, Estudiante Maestria en Ciencias Quimicas,
Mexico. 2 Universidad Nacional Autónoma de México, FES Cuautitlan Química, Mexico.
ZnGa2O4:Cr 3+ nanophosphors with an average crystallite size of 5 nm were
prepared by a combustion method. We observed changes in luminescence
properties compared with micro-crystalline system, such as highly efficient Cr 3+
emission and a decrease in the persistent luminescence decay time of the nearinfrared
emission. We observe a little change in the band gap. The emission
intensity of the efficient broad band at near-infrared emission was very high,
under excitation in the UV, blue and green wave lengths. The system presents
good stability in colloidal suspensions of water and glucose and conserve their
luminescence properties. The system shows applications in-vivo optical imaging
due to the rather high penetration depth of near infrared radiation into human
tissue. Its small crystallite size allows to enter cells for bioimaging, non-toxicity,
good dispersion in the biological environment and resistant to photobleaching.
Acknowledgment:
PAPIIT IT101416 UNAM; CONACYT
Keywords: ZnGa2O4:Cr3+, Nanoparticles, Persistent luminescence
Presenting authors email: f50117@hotmail.com