Search for dissertations about: "LEDs"

Showing result 16 - 20 of 107 swedish dissertations containing the word LEDs.

  2. 16. Year-round production of forest seedlings under LED lamps : Biological and energetic implications of indoor cultivation

    Author : Marco Hernandez Velasco; Uwe Zimmermann; Anders Mattsson; Frank Fiedler; Johanna Riikonen; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Picea abies; Pinus sylvestris; year-round cultivation; forest seedlings; LED lamps; light quality; light quantity; daily light integral; adaptive lighting control; greenhouse integrated photovoltaics; agrivoltaics; seedling growth performance; short-day treatments; cold hardiness; light shock stress; Engineering Science; Teknisk fysik;

    Abstract : Year-round cultivation of forest seedlings under light emitting diodes (LED) is a technology receiving increased attention from nurseries in the boreal forest regions. In these areas, the climate is characterized by strong seasonal fluctuations, resulting in short vegetation periods with narrow time windows for seedling transplanting and outdoor growth. READ MORE

  4. 17. Optical Characterization of III-Nitride and II-V Semiconductor Nanowires

    Author : David Lindgren; Fasta tillståndets fysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; III-Nitride; III-V; Fysicumarkivet A:2014:Lindgren; Semiconductor; Nanowire; Photoluminescence; Cathodoluminescence;

    Abstract : The optical properties of III-V semiconductor nanowires for optical devices have been investigated by photoluminescence spectroscopy, cathodoluminescence spectroscopy and cathodoluminescence imaging. The material systems that have been studied include the nitrides (InN, GaN and AlN) and ternaries, and a few common phosphides and arsenides. READ MORE

  5. 18. Scanning probe techniques as an investigation tool for semiconductor nanostructures and devices

    Author : Jovana Colvin; NanoLund: Centre for Nanoscience; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; III-V semiconductors; AFM; STM; KPM; SCM; c-AFM; Crystal growth; Doping; Defects;

    Abstract : Semiconductor nanostructure based devices provide new opportunities for contributing to a sustainable energy usage. This includes harvesting of energy (solar cells) and saving of energy, e.g. in lighting (light-emitting diodes, LEDs) and transfer of energy (power devices). READ MORE

  6. 19. Elements of AlGaN-Based Light Emitters

    Author : Martin Stattin; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; graphene; vertical cavity surface emitting laser; deep-ultraviolet; III-nitride; near-infrared; light emitting diode; visible; AlGaN; quantum cascade laser;

    Abstract : The III-nitrides have enabled a range of optoelectronic devices and associated applications of great industrial and societal importance. However, the full potential of the III-nitrides remains to be explored. READ MORE

  7. 20. Light emitting devices based on silicon nanostructures

    Author : Nenad Lalic; KTH; []
    Keywords : ;

    Abstract : Although silicon is the dominant semiconductor today, lightemitting devices are currently based on compound semiconductorsdue to their direct band-gap, which promotes fast radiativerecombination. However, in nanometer-size silicon structures,carrier confinement enhances the radiative recombination,while, at the same time, suppresses diffusion to non-radiativerecombination centra, resulting in a significant increase inlight emission efficiency. READ MORE