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Quantum well design and diffraction efficiency of quantum well light emitting diode

Khoshnegar, M ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. DOI: 10.1117/12.809480
  3. Publisher: 2009
  4. Abstract:
  5. In this work, a GaN-based quantum well LED is theoretically analyzed in a multi-layer structure composed of a quantum well embedded in a waveguide core surrounded by photonic crystal slab and a sapphire substrate. The electromagnetic eigenmodes are obtained throughout above structure via revised plane wave-scattering matrix method. The omnidirectional transmission and reflection are investigated for both TE and TM polarizations from diffraction channels in Ewald construction. Then, we introduced angular power density and calculated radiative modes extraction efficiency. All structural parameters, such as lattice geometry, lattice constant, photonic crystal thickness and filling factor, are taken into account. We also investigated the coupling efficiency between waveguide modes and Bloch modes in structure which include decomposed emission and extraction regions. In order to design a quantum well white LED, we used a MQW with adjusted material composition. The photoluminescence spectrum for both TE and TM polarizations is obtained through a combination of k.p perturbation and transfer matrix method. © 2009 SPIE
  6. Keywords:
  7. Coupling efficiency ; Extraction efficiency ; K.P perturbation ; Photonic crystal slabs ; Scattering matrix method ; White LED ; Corundum ; Crystal atomic structure ; Crystallography ; Diffraction ; Electric converters ; Emission spectroscopy ; Extraction ; Gallium alloys ; Gallium nitride ; Light ; Light emitting diodes ; Organic light emitting diodes (OLED) ; Periodic structures ; Phonons ; Photonic crystals ; Physical optics ; Polarization ; Scattering ; Semiconducting gallium ; Semiconductor quantum wells ; Transfer matrix method ; Waveguides ; Quantum efficiency
  8. Source: Photonic and Phononic Crystal Materials and Devices IX, San Jose, CA, 27 January 2009 through 29 January 2009 ; Volume 7223 , 2009 ; 0277786X (ISSN)
  9. URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/7223/1/Quantum-well-design-and-diffraction-efficiency-of-quantum-well-light/10.1117/12.809480.full