Title

Size-dependent surface energy loss in nanocrystalline YBO3:Eu3+

Presenter Information

Andrew Lawler
Kristopher Olson

Document Type

Oral Presentation

Location

SURC Ballroom A

Start Date

17-5-2012

End Date

17-5-2012

Abstract

(Y,Gd)BO3:Eu3+ is a commonly used plasma-display television phosphor, with high host to activator energy-transfer efficiency. My project is working to quantify the effects of energy loss to the surface on this efficiency. Host-to activator transfer efficiency calculations for nanocrystalline (~50-500 nm) YBO3:Eu3+ show measurable surface loss for particles as large as 300 nm. Spectroscopic data describing absorbed and emitted energies were evaluated with published kinetic models and show size-dependent surface loss, increasing as particle size decreases, with approximately 40% of energy lost to the surface for particles smaller than 100 nm. Further research focuses on testing the kinetic models with different host lattices (specifically YPO4), with current work involving gaussian curve fitting to accurately quantify peak height for absorbance and excitation intensity.

Poster Number

26

Faculty Mentor(s)

Anthony Diaz

Additional Mentoring Department

Chemistry

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May 17th, 8:30 AM May 17th, 11:00 AM

Size-dependent surface energy loss in nanocrystalline YBO3:Eu3+

SURC Ballroom A

(Y,Gd)BO3:Eu3+ is a commonly used plasma-display television phosphor, with high host to activator energy-transfer efficiency. My project is working to quantify the effects of energy loss to the surface on this efficiency. Host-to activator transfer efficiency calculations for nanocrystalline (~50-500 nm) YBO3:Eu3+ show measurable surface loss for particles as large as 300 nm. Spectroscopic data describing absorbed and emitted energies were evaluated with published kinetic models and show size-dependent surface loss, increasing as particle size decreases, with approximately 40% of energy lost to the surface for particles smaller than 100 nm. Further research focuses on testing the kinetic models with different host lattices (specifically YPO4), with current work involving gaussian curve fitting to accurately quantify peak height for absorbance and excitation intensity.