Hydride vapor-phase epitaxy (HVPE) was used to grow aluminum gallium nitride-based p–n diode structures on sapphire (0001) substrates. In the diode structure, an n-type AlGaN photon-emitting layer was sandwiched between n-type and p-type AlGaN cladding layers that contained higher AlN concentrations. These diode structures were processed and subsequently packaged into transistor outline cans. The light-emitting diodes (LEDs) were characterized using a state-of-the-art spectroradiometer. LED spectral emission occurred at a peak wavelength of 341 nm with a typical full width at half-maximum of approximately 14 nm. Pulsed injection currents of 110 mA resulted in greater than 2 mW of optical output power at a wavelength of 341 nm. This HVPE-grown LED’s pulsed optical power output level is comparable to reported results on similar sized metalorganic chemical vapor deposition grown ultraviolet LEDs with emission wavelengths near 340 nm.
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REPORT DATE (DD-MM-YY)
August 2002
REPORT TYPE
Journal Article Preprint
TITLE AND SUBTITLE
REDUCED POWER CONSUMPTION IN GaAs-BASED BIPOLAR CASCADE LASERS
AUTHOR(S)W
SPONSORING/MONITORING AGENCY REPORT NUMBER(S)
AFRL-SN-WP-TP-2002-104
DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited.
SUPPLEMENTARY NOTESThis material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Technical paper preprint submitted on July 29, 2002 for publication in Electronics Letters.
ABSTRACTA systematic study of GaAs tunnel junctions for use in bipolar cascade laser diodes was performed. We investigate the current voltage characteristics of individual degenerately doped n+ and p+ regions grown by MBE and then place the most promising designs within the individual laser substructures. This has resulted in a 1 V reduction in operating voltage, as verified by comparing the lasing characteristics of several edge-emitting laser devices. Introduction: Bipolar cascade lasers (BCLs) show excellent potential for producing gain in radio
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