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Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
Published on: November 15, 2016
Structural and up-conversion properties of Er3+ and Yb3+ co-doped Y2Ti2O7 phosphors
B P Singh1, A K Parchur, R K Singh
1Department of Applied Physics, Indian Institute of Technology (BHU), Varanasi, India.
Physical Chemistry Chemical Physics : PCCP
|January 31, 2013
Summary
Erbium/Ytterbium co-doped Yttrium Titanate (EYYTO) phosphors exhibit tunable green and red up-conversion emissions. These materials, synthesized via solid-state reaction, show potential for applications requiring specific light emissions.
Area of Science:
- Materials Science
- Solid-state Chemistry
- Luminescence
Background:
- Yttrium Titanate (YTO) is a ceramic material with a pyrochlore structure.
- Rare-earth doping, specifically with Erbium (Er3+) and Ytterbium (Yb3+), can induce up-conversion luminescence.
- Up-conversion materials convert lower energy photons to higher energy photons, useful in various optical applications.
Purpose of the Study:
- To synthesize and characterize Erbium/Ytterbium co-doped Yttrium Titanate (EYYTO) phosphors.
- To investigate the up-conversion luminescence properties of EYYTO under near-infrared excitation.
- To explore the potential for color tuning in EYYTO phosphors.
Main Methods:
- Solid-state reaction method for phosphor synthesis.
- X-ray diffraction (XRD) for structural identification (face-centered cubic pyrochlore).
- Spectroscopic analysis (up-conversion emission spectra) under 976 nm laser excitation.
- Power dependence studies to determine the mechanism of luminescence.
- Photoluminescence lifetime measurements.
Main Results:
- EYYTO phosphors were successfully synthesized with a face-centered cubic pyrochlore structure.
- Up-conversion emissions were observed at approximately 524 nm (green), 548 nm (green), and 661 nm (red), corresponding to Er3+ electronic transitions.
- Power dependence studies indicated a two-photon absorption mechanism for the observed emissions.
- Monodispersed colloidal EYYTO solutions exhibited strong green and red emissions.
- Luminescence intensity varied with laser excitation power, enabling color tuning.
- The photoluminescence lifetime of the green band at 548 nm was measured to be approximately 446 μs.
Conclusions:
- EYYTO phosphors can be effectively prepared using the solid-state reaction method.
- The synthesized materials display characteristic Er3+ up-conversion luminescence in the green and red regions.
- The color output of EYYTO phosphors can be tuned by adjusting the laser excitation power.
- The study demonstrates the potential of EYYTO for applications requiring tunable up-conversion luminescence.
