8-12 July 2013
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=13&confId=32"><font color=#ff0000>SAIP2013 PROCEEDINGS AVAILABLE</font></a>

Synthesis and Characterization of white light emitting Sr<sub>2</sub>SiO<sub>4</sub>:Tb<sup>3+</sup>,Eu<sup>3+</sup> phosphor

9 Jul 2013, 17:40
1h
Poster Presentation Track A - Division for Condensed Matter Physics and Materials Poster1

Speaker

Ms Modiehi Amelia Tshabalala (University of the Free State)

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

Yes

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

PhD

Main supervisor (name and email)<br>and his / her institution

Prof Ntwaeaborwa
ntwaeab@ufs.ac.za
University of the Free State

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

Yes

Abstract content <br> &nbsp; (Max 300 words)

In recent years, the study on white light phosphors suitable for ultraviolet (UV) excitation has been attracting more attention for use in white light emitting diodes (LEDs). In white light LEDs, white light can be generated by combination of light of three primary colors (red, green and blue) emitted from different LED chips1 or combination of blue LED with yellow-emitting phosphor materials2,3. It is important to find a phosphor that can be excited under near-ultra-violet and the blue region3. In recent studies it has been established that white light can be generated by doping one or more activator(s) in one matrix. For example, in this study white photoluminescence was generated when Sr2SiO4 co-doped with Tb3+ and Eu3+ was excited at 227 nm using a monochromatized xenon lamp. The calculated Commission Internationale de l’Eclairage (CIE) chromatic coordinates of the generated white light were (x=0.340, y=0.375), which are very close to those of standard white colour (x=0.333, y=0.333). The X-ray diffraction spectra indicated that the Sr2SiO4:Tb3+,Eu3+ phosphor material was successfully prepared at 1000 °C using the solid state method. Scanning electron microscopy images showed agglomeration of particles with irregular shapes. The decay characteristics showed that the phosphor consists of a single exponential decay curve.

References

(1) Yanmin, Q.; Xinbo, Z.; Xiao, Y.; Yan, C.; Hai, G.; Journal Rare Earths 2009, 27(2), 323
(2) J.K. Park, M.A. Lim, C.H. Kim, H.D. Park Applied Physics Letters 2003, 82(5), 683
(3) Yao, S.; Chen, D.; Central European Journal of Physics 2007, 5(4), 558

Primary author

Ms Modiehi Amelia Tshabalala (University of the Free State)

Co-authors

Prof. Hendrik Swart (University of the Free State) Prof. Odirileng Martin Ntwaeaborwa (University of the Free State)

Presentation Materials

Peer reviewing

Paper