PhD Thesis Defense by Ashley Black on 16th June at 11:30 am

Title: "New oxynitride materials with luminescent, magnetic and catalytic properties"

Date:  Friday 16th June
Time: 11:30 am
Place: Sala d'Actes Carles Miravitlles - ICMAB

Abstract: 
In this thesis we describe the synthesis and luminescent properties of a new family of phosphors for white LED technology, based on orthosilicate β-K₂SO₄ structure. In particular, the oxynitridosilicates LaMSiO₃N (M = Sr, Ba) and Sr_2-xLa_xSiO_4-xN_x (0≤x<1) that when doped with Eu²⁺ or Ce³⁺ show tuneable luminescence between 500 and 750 nm. In the second section, we extend the AB(O,N)₃ oxynitride perovskites to the  transition metals  Cr and  Hf. The antiferromagnetic behaviour of Cr³⁺/Cr⁴⁺ in LnCrO_3-xN_x (Ln = La, Pr, Nd;  0≤x≤0.59) perovskites.

Supervisors:  

• Amparo Fuertes, Solid State Chemistry, ICMAB

• President: Regino Saez Puche, Universidad Complutense de Madrid, Spain
• Secretary: José Peral, Universitat Autònoma de Barcelona, Spain
• Vocal: Ralf Riedel, Darmstadt University of Technology, Germany