Journal
INTERNATIONAL JOURNAL OF NANOTECHNOLOGY
Volume 19, Issue 2-5, Pages 161-173Publisher
INDERSCIENCE ENTERPRISES LTD
DOI: 10.1504/IJNT.2022.124498
Keywords
microwave combustion; phosphor; YAG; Ce; white light; light emitting diode; annealing
Funding
- Malaysia Ministry of Education (MOE) under LRGS (Wide Band Gap Semiconductor) [203/CINOR/6720013]
- Universiti Sains Malaysia
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A cerium doped yttrium aluminium garnet (YAG:Ce) phosphor was synthesized using facile mixed-fuel microwave solution combustion synthesis (MSCS) and subjected to a post-annealing treatment. The annealed powder exhibited improved crystallinity, crystallite size, and spherical-like nano-particles morphology. The phosphor showed a broad yellow emission centred at 534 nm, with increased emission intensity after annealing treatment. Electroluminescence (EL) measurement of the phosphors in a white light emitting diode (WLED) provided characterization of the color properties.
Cerium doped yttrium aluminium garnet (YAG:Ce) phosphor was widely used as colour converter in white light emitting diode (WLED). Such phosphor was commonly synthesised with high temperature solid-state reaction. However, powder derived from this method exhibited irregular and highly agglomerate particles. A repeated milling process to break the particles will cause additional defects formation, causing the optical properties to deteriorate. In this work, YAG doped with 0.1 mol% of cerium nanoceramic powder has been synthesised with facile mixed-fuel microwave solution combustion synthesis (MSCS). The as-synthesised powder was subjected to a post-annealing treatment to enhance the structural and optical properties. HR-XRD revealed an increased in crystallinity as well as crystallite size for the annealed powder. Moreover, FESEM analysis showed spherical-like nano-particles morphology. For optical properties, broad yellow emission centred at 534 nm was demonstrated with PL measurement and the emission intensity was increased after annealing treatment. Finally, the as-combusted and annealed YAG:Ce phosphors was fabricated into WLED and characterised with electroluminescence (EL) measurement to determine the colour properties (CIE, CCT, CRI, purity and D-uv).
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