Sökning: "ultraviolet light"

Visar resultat 1 - 5 av 115 avhandlingar innehållade orden ultraviolet light.

  1. 1. Thin-film ultraviolet light-emitting diodes realized by electrochemical etching of AlGaN

    Författare :Michael Alexander Bergmann; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; electrochemical etching; substrate removal; thin-film flip-chip; thermocompression bonding; light-emitting diodes; AlGaN; heterogeneous integration; LEDs; ultraviolet light; UVB;

    Sammanfattning : Ultraviolet (UV) light sources have a direct impact on everyone’s life. They are used to sterilize surfaces as well as for water purification. In addition, they are used in green houses to enhance health-promoting substances in plants, for phototherapy to treat skin diseases, for sensing and material curing. LÄS MER

  2. 2. Control of Coherent Extreme Ultraviolet Light and Light Sources

    Författare :Neven Ibrakovic; Atomfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; ultrafast lasers; XUV optics; high-order harmonic generation; quantum path interference; opto-optical modulation; free electron lasers; nitrogen lasing; Fysicumarkivet A:2019:Ibrakovic;

    Sammanfattning : Coherent extreme ultraviolet (XUV) light sources are necessary for the investigation of physical processes in the natural length and time scales of atoms. These experiments require a high degree of control of the coherent XUV light. LÄS MER

  3. 3. Ultraviolet Radiation Cataract

    Författare :Konstantin Galichanin; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; lens;

    Sammanfattning : Cataract is the leading cause of blindness in the world. Epidemiological and experimental evidence supports a link between mid-range ultraviolet radiation (UVR-B) exposure and the development of cataract. LÄS MER

  4. 4. Towards Novel AlGaN-Based Light Emitters

    Författare :Martin Stattin; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; AlGaN; light emitting diode; deep ultraviolet; III-Nitrides; near infrared; quantum cascade laser;

    Sammanfattning : The unique properties of the AlGaN semiconductors make them a suitable choice for optoelectronic devices at both short and long wavelengths, based on interband and intersubband transitions, respectively. What sets AlGaN apart from other wide-bandgap semiconductors is the possibility to obtain both p- and n-type conductivity as well as the direct bandgap. LÄS MER

  5. 5. Elements of AlGaN-Based Light Emitters

    Författare :Martin Stattin; Chalmers University of Technology; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER