Enhancement of the characteristics and investigation of optical gain of nano-crystalline silicon light emitting devices and materials

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To enhance the luminescence characteristics, quantum-sized nanosilicon have been studied along with the optoelectronic functioning. Major results are summarized as follows.(1) Tuning of luminescence band : By appropriate combination of high pressure water vapor annealing and rapid thermal oxidation, the PL emission was successfully tuned from red to blue without affect on both the efficiency and the stability.(2) Finding of blue phosphorescence : It was found that obtained blue emission exhibits phosphorescence with a significantly long decay time. By spectrometric analyses of temperature dependence and polarization memory, transition model between discrete energy levels has been proposed.(3) Photonic functionality : In nanosilicon materials doped with dye molecules, rare earth elements, and conducting polymers, photonic functions such as a significant luminescence enhancement by the internal energy transfer was confirmed.