Strongly transverse-electric-polarized emission from deep ultraviolet AlGaN quantum well light emitting diodes

The optical polarization of emission from ultraviolet (UV) light emitting diodes (LEDs) based on (0001)-oriented AlxGa1−xN multiple quantum wells (MQWs) has been studied by simulations and electroluminescence measurements. With increasing aluminum mole fraction in the quantum well x, the in-plane in...

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Bibliographic Details
Published in:Applied physics letters 2015-10, Vol.107 (14)
Main Authors: Reich, Christoph, Guttmann, Martin, Feneberg, Martin, Wernicke, Tim, Mehnke, Frank, Kuhn, Christian, Rass, Jens, Lapeyrade, Mickael, Einfeldt, Sven, Knauer, Arne, Kueller, Viola, Weyers, Markus, Goldhahn, Rüdiger, Kneissl, Michael
Format: Article
Language:English
Subjects:
ALUMINIUM
Aluminum
Aluminum gallium nitrides
Applied physics
Band theory
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computer simulation
DESIGN
Design optimization
EFFICIENCY
ELECTROLUMINESCENCE
Emission
LIGHT EMITTING DIODES
Luminous intensity
Optical polarization
Organic light emitting diodes
POLARIZATION
Polarized light
QUANTUM WELLS
SAPPHIRE
SIMULATION
Spectral emittance
ULTRAVIOLET RADIATION
WAVELENGTHS
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Summary:The optical polarization of emission from ultraviolet (UV) light emitting diodes (LEDs) based on (0001)-oriented AlxGa1−xN multiple quantum wells (MQWs) has been studied by simulations and electroluminescence measurements. With increasing aluminum mole fraction in the quantum well x, the in-plane intensity of transverse-electric (TE) polarized light decreases relative to that of the transverse-magnetic polarized light, attributed to a reordering of the valence bands in AlxGa1−xN. Using k ⋅ p theoretical model calculations, the AlGaN MQW active region design has been optimized, yielding increased TE polarization and thus higher extraction efficiency for bottom-emitting LEDs in the deep UV spectral range. Using (i) narrow quantum wells, (ii) barriers with high aluminum mole fractions, and (iii) compressive growth on patterned aluminum nitride sapphire templates, strongly TE-polarized emission was observed at wavelengths as short as 239 nm.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4932651