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InGaN/GaN Nano-pyramids – Promising Building Blocks of Future Solid State Lighting by Krishnan Jagadamma Lethy (Physics)
Solid state lighting- direct conversion of electricity to visible white light using semiconductor materials- has the potential to replace today’s inefficient incandescent and CFLs lighting systems. Though SSL has ~55 % conversion efficiency compared to 5-25 % of the latter, it is not yet fully matured to rein the general lighting applications. However, each incremental improvement in efficiency opens door to replace less efficient light sources. According to reports, an improvement in luminous efficiency by 1% can save 2 billion dollars per year and avoid mega tonnes of CO2 exhaust to environment. InGaN QWs on nano-patterned GaN nanopyramids are characterised by increased light emitting efficiency, light emitting area, light extraction efficiency, ability to white light generation and improved, all that contributing towards high luminous efficiency. Figure 1 shows the light emission from an array of InGaN/GaN nanopyramids acquired using cathodoluminescence hyperspectral imaging. These blue light emitting nanopyramids are promising for white light SSL applications.
Image: © 2013 Krishnan Jagadamma Lethy
InGaN/GaN Nano-pyramids – Promising Building Blocks of Future Solid State Lighting by Krishnan Jagadamma Lethy (Physics)
Solid state lighting- direct conversion of electricity to visible white light using semiconductor materials- has the potential to replace today’s inefficient incandescent and CFLs lighting systems. Though SSL has ~55 % conversion efficiency compared to 5-25 % of the latter, it is not yet fully matured to rein the general lighting applications. However, each incremental improvement in efficiency opens door to replace less efficient light sources. According to reports, an improvement in luminous efficiency by 1% can save 2 billion dollars per year and avoid mega tonnes of CO2 exhaust to environment. InGaN QWs on nano-patterned GaN nanopyramids are characterised by increased light emitting efficiency, light emitting area, light extraction efficiency, ability to white light generation and improved, all that contributing towards high luminous efficiency. Figure 1 shows the light emission from an array of InGaN/GaN nanopyramids acquired using cathodoluminescence hyperspectral imaging. These blue light emitting nanopyramids are promising for white light SSL applications.
Image: © 2013 Krishnan Jagadamma Lethy