Search for dissertations about: "light emitting diodes"

Showing result 1 - 5 of 93 swedish dissertations containing the words light emitting diodes.

  1. 1. Polymer light-emitting electrochemical cells Utilizing doping for generation of light

    University dissertation from Umeå : Department of Physics, Umeå University

    Author : Piotr Matyba; Ludvig Edman; Qibing Pei; [2011]
    Keywords : ;

    Abstract :     The current implementation of conjugated polymers (“conducting plastics”) in a wide range of devices promises to bring the vision of a new generation of flexible, efficient and low-cost applications to reality. Plastic lightemitting devices in the form of polymer light-emitting diodes (PLEDs) are projected to be particularly close to the market in applications such as large area and conformable illumination panels and high-performance thin displays. READ MORE

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

    University dissertation from Gothenburg : Chalmers tekniska högskola

    Author : Michael Alexander Bergmann; [2020]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; electrochemical etching; substrate removal; thin-film flip-chip; thermocompression bonding; light-emitting diodes; AlGaN; heterogeneous integration; LEDs; ultraviolet light; UVB;

    Abstract : 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. READ MORE

  3. 3. Light-Emitting Electrochemical Transistors

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Jiang Liu; Magnus Berggren; Isak Engquist; Qibing Pei; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Since the discovery of conductive polymers in 1977, the implementation of organic conjugated materials in electronic applications has been of great interest in both industry and academia. The goal of organic electronics is to realize large-area, inexpensive and mechanically-flexible electronic applications. READ MORE

  4. 4. High-Quality Perovskite Films for Efficient and Stable Light-Emitting Diodes

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Heyong Wang; Feng Gao; Olle Inganäs; Xiaoke Liu; Ifor David William Samuel; [2020]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; perovskite light-emitting diodes; efficiency; stability; growth process; ion migration;

    Abstract : Metal halide perovskites have attracted significant attention for light-emitting applications, because of their excellent properties, such as high photoluminescence quantum yields (PLQYs), good charge mobility, narrow emission bandwidth, readily tunable emission spectra ranging from ultraviolet to near-infrared, and solution processability. Since the first room-temperature perovskite-based light-emitting diodes (PeLEDs) reported in 2014, tremendous efforts have been made to promote the efficiencies of PeLEDs, including theoretical simulation, materials design, and device engineering. READ MORE

  5. 5. Inorganic-Organic Hybrid Technology for Light Emitting Diodes

    University dissertation from Liu Tryck : Linköping University Electronic Press

    Author : Amal Wadeasa; Magnus Willander; Omer Nour; Rose-Marie Mikström; [2009]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : Since the first report of inorganic light emtting diodes a century ago the field of inorganic light emitting diodes has evolved rapidly. T he development of light emitting diodes technology has caused their efficiency and light output to increase exponentially, with a doubling occuring about every 36 months  since the 1960s, in a similar way to Moor´s law. READ MORE