Abstracts Book - IMRC 2018

• SF2-P019
STUDY OF THE PHOTOLUMINESCENCE MECHANISMS IN ZINC
SULPHIDE (ZnS) DOPED WITH EUROPIUM 2+ (Eu 2+ ) AND WITH
EXCESS OF ZINC (Zn).
Victor Hugo Lopez Lugo 1 , Juan Carlos Alonso Huitron 1 , Martha Judith Rivera Medina 1
1 Instituto de Investigaciones en Materiales, Condesed matter and cryogenics, Mexico.
The phosphors doped with rare earths have been very important for the
development of a wide variety of modern luminescent devices such as:
fluorescent lamps, solid state lasers, flat screens, etc. Currently with the
combination of rare earths as dopants for example Eu (2+) and Ce (3+), it is
possible to make activated inorganic phosphors that emit in the blue, green and
red color, for the manufacture of white light emitting diodes ( WLEDs) with good
control in the color balance of the light. In the present work we obtained thin
films of zinc sulphide (ZnS) doped with europium 2+, and zinc sulphide with
excess of zinc using the ultrasonic spray pyrolysis technique. After the deposit,
the films were subjected to thermal treatment in an ambient atmosphere at a
temperature of 500 ° C. Using spectrofluorometry, the excitation and emission
curves of both types of samples were obtained to compare how the
luminescence is affected. It was observed that the heat treatment produces
changes in the wavelength of maximum emission, in the intensity of the
luminescence and in the excitation spectra, in both types of samples. These
changes are discussed in terms of the mechanisms of luminescence, and
provide a way to control the emission of these phosphors.
Keywords: Ultrasonic spray pyrolysis, ZnS: Eu (2+) thin films, Thermal treatment
Presenting authors email: ultracosmos_03@ciencias.unam.mx