Brightly photoluminescent phosphor materials based on silicon quantum dots with oxide shell passivation
Chang-Ching Tu1, Qifeng Zhang, Lih Y Lin
1Department of Materials Science & Engineering, University of Washington, Seattle, Washington 98195, USA.
Optics Express
|March 3, 2012
Summary
We developed novel silicon quantum dot (SiQD) phosphors for versatile light emission. These materials offer bright photoluminescence across the visible spectrum and are suitable for solution-processing applications.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Silicon quantum dots (SiQDs) are promising for optoelectronic applications due to their tunable light emission.
- Developing stable and efficiently processable SiQD-based materials remains a challenge.
Purpose of the Study:
- To synthesize and characterize novel silicon-based phosphor materials.
- To explore their photoluminescence properties and potential for solution-processing.
Main Methods:
- Electrochemical etching of silicon wafers to create SiQDs.
- Isotropic etching with HF/HNO3 to control SiQD size and emission wavelength.
- Surface functionalization with alkoxysilanes for stable suspensions.
Main Results:
- Demonstrated bright photoluminescence from near-infrared to green.
- Achieved a photoluminescence external quantum efficiency of 15.9% for red-emitting SiQDs.
- Developed stable, solution-processable phosphors compatible with non-polar solvents.
Conclusions:
- Silicon quantum dots offer a viable platform for developing advanced phosphor materials.
- The developed phosphors exhibit excellent photoluminescence and stability for optoelectronic applications.
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