Extracting light out of LEDs
| Autor: | Christopher Wiesmann, Julius Muschaweck |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Physics
Photon Geometrical optics business.industry Physics::Optics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Optics law Optoelectronics Quantum efficiency Spontaneous emission business Instrumentation Refractive index Nonimaging optics Light-emitting diode Photonic crystal |
| Zdroj: | aot. 2:291-300 |
| ISSN: | 2192-8584 2192-8576 |
| DOI: | 10.1515/aot-2013-0027 |
| Popis: | ‘External quantum efficiency’, that is, the number of photons generated per electron passing through the p-n junction of an LED is probably the most important number to quantify the performance of an LED chip. Although advances in epitaxy have increased the fraction of radiative recombination to extremely high values, the extraction of the precious photons that are trapped in a high refractive index crystal is still tricky. In this brief tutorial, we look at the physics of light extraction both from a geometrical optics/thermodynamic and a wave optics point of view, discussing both random and deterministic surface structures. |
| Databáze: | OpenAIRE |
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