Influence of cavity de-tuning in semiconductor microcavity LEDs
| Autor: | T. Takamori, Takeshi Kamijoh, A. R. Pratt |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Materials science
business.industry Slope efficiency Atmospheric temperature range Condensed Matter Physics Optical microcavity Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Wavelength Semiconductor Optics law Optoelectronics business Quantum well Beam divergence Light-emitting diode |
| Zdroj: | Physica E: Low-dimensional Systems and Nanostructures. 7:656-660 |
| ISSN: | 1386-9477 |
| Popis: | Data are presented showing the precise role of the cavity de-tuning on the emission properties of semiconductor microcavity light emitting diodes (MC-LEDs). Enhanced output power and narrow line width emission have been observed over a wide range of cavity de-tunings, with a power reduction of less than −1 dB observed for ±12 nm de-tuned devices. For a resonantly de-tuned MC-LED, the slope efficiency extracted from the power output versus current characteristics decreases monotonically with increasing temperature. However, for a MC-LED de-tuned +5.6 nm to long wavelength with respect to the room temperature quantum well (QW) peak, the extracted slope efficiencies vary by less than ±0.5 dB over a temperature range of greater than 65°C. Compared to a conventional LED, narrower beam divergence is observed for MC-LEDs de-tuned to short wavelength with respect to the bare QW peak. For positively de-tuned MC-LEDs the beam divergence broadens, and the far-field emission profiles exhibit a double-lobed pattern that is sensitive to pump level. |
| Databáze: | OpenAIRE |
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