Light emitting diodes (LEDs).

9 Outubro 2019, 14:30 • José Figueiredo

Light extraction. distributed Bragg reflector (DBR) LEDs and resonant cavity (RC) LEDs. Surface emitting LEDs (SLEDs) and Edge emitting LEDs (ELEDs). Pigtailed LEDs. LED current-voltage (I-V) characteristics. LED parameters (internal quantum efficiency, extraction efficiency, external quantum efficiency, power conversion efficiency, LED brightness, luminous efficacy). White LEDs. Electrical model of a LED. Dynamic resistance and capacitance. Examples of LED driving circuits. Frequency response LEDs. Electrical and optical bandwidth.

Light emitting diodes (LEDs).

9 Outubro 2019, 13:30 • José Figueiredo

Light extraction. distributed Bragg reflector (DBR) LEDs and resonant cavity (RC) LEDs. Surface emitting LEDs (SLEDs) and Edge emitting LEDs (ELEDs). Pigtailed LEDs. LED current-voltage (I-V) characteristics. LED parameters (internal quantum efficiency, extraction efficiency, external quantum efficiency, power conversion efficiency, LED brightness, luminous efficacy). White LEDs. Electrical model of a LED. Dynamic resistance and capacitance. Examples of LED driving circuits. Frequency response LEDs. Electrical and optical bandwidth.

Light emitting diodes.

7 Outubro 2019, 15:00 • José Figueiredo

Light emitting diodes (LEDs). Materials and basic principle of an LED. Homo vs. heterojunction LEDs. Emission spectrum, spectral linewidth. Multi-quantum well LEDs.

Light emitting diodes.

7 Outubro 2019, 14:00 • José Figueiredo

Light emitting diodes (LEDs). Materials and basic principle of an LED. Homo vs. heterojunction LEDs. Emission spectrum, spectral linewidth. Multi-quantum well LEDs.

Optical Processes in Semiconductors.

2 Outubro 2019, 14:30 • José Figueiredo

Basic Optical Processes in Semiconductors: (Stimulated) absorption, spontaneous emission, and stimulated emission. Continuous excitation. Radiative recombination. Exciton recombination. Spontaneous recombination rates and generation rates. Non-radiative recombination. Optical Characterization Methods: reflection spectroscopy, photoluminescence (PL), transmission of light and absorption coefficient. A brief discussion of advanced methods of epitaxial growth. Molecular beam epitaxy. Case of study the laser diode from homojunction to current laser diode heterostructures.

(Biblio: chapter 6 of Compound Semiconductors: Physics, Technology, and Device Concepts, Ferdinand Scholz, Pan Stanford Publishing Pte. Ltd. 2018)