Sökning: "light emitting diodes"

Visar resultat 21 - 25 av 50 uppsatser innehållade orden light emitting diodes.

  1. 21. LED's Buy Greener: Shedding Light on Sustainable Procurement

    L3-uppsats, Lunds universitet/Internationella miljöinstitutet

    Författare :Hippolyte De Bellefroid; Julie Emmrich; Wolfgang Haider; Dalia Hashweh; Caroline Heinz; Anita Lazurko; Antoine Lucic; Robin Mace-Snaith; Sahar Sajjad Malik; Shushant Vasisth; Yifei Zhao; [2017]
    Nyckelord :Technology and Engineering; Social Sciences; Earth and Environmental Sciences; Business and Economics;

    Sammanfattning : In last decade, the lighting industry significantly changed with the development of light emitting diodes (LEDs) and their corresponding penetration of the market. The new technology increases energy efficiency and longevity compared to other types of lamps. LÄS MER

  3. 22. AESTHETIC IMPACTS OF WIND FARM OBSTRUCTION LIGHTING : A STUDY ABOUT AVIATION SAFETY PROTOCOLS, LIGHTING TECHNOLOGY, AND PUBLIC ATTITUDES

    Magister-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Umer Qureshi; [2017]
    Nyckelord :aesthetic impacts; aviation safety protocols; obstruction lighting; public attitudes; wind energy technology;

    Sammanfattning : The overall purpose of the study was to examine the aesthetic impacts of wind farm obstruction lighting. The research problems investigated in this study were; aviation safety regulations for wind farm obstruction lighting in different countries, obstruction lighting technology, and the public attitudes towards wind farming. LÄS MER

  4. 23. Surface energy modification of metal oxide to enhance electron injection in light-emitting devices : charge balance in hybrid OLEDs and OLETs

    Master-uppsats, Högskolan i Gävle/Avdelningen för elektronik, matematik och naturvetenskap

    Författare :Sergio Apicella Fernandez; [2017]
    Nyckelord :organic; inorganic; semiconductors; OLEDs; OLETs; TFT; stack; thin-film; deposition; spin-coating; thermal; evaporation; process; reactive; sputtering; luminescence; EQE; PEIE; metal-oxide; ZnO; ZnO:N; MoO3; F8BT; Alq3; NPB;

    Sammanfattning : Organic semiconductors (OSCs) present an electron mobility lower by several orders of magnitude than the hole mobility, giving rise to an electron-hole charge imbalance in organic devices such as organic light-emitting diodes (OLEDs) and organic light-emitting transistors (OLETs). In this thesis project, I tried to achieve an efficient electron transport and injection properties in opto-electronic devices, using inorganic n-type metal oxides (MOs) instead of organic n-type materials and a polyethyleneimine ethoxylated (PEIE) thin layer as electron transport (ETLs) and injection layers (EILs), respectively. LÄS MER

  5. 24. Optical Imaging and Spectroscopy of Airborne Nanowires

    Master-uppsats, Lunds universitet/Fysiska institutionen

    Författare :Eleni Gompou; [2017]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : Semiconductor nanowires are the potential base for building many future devices like solar cells and light emitting diodes. To reach the level of commercialization of such devices, mass production of NWs at low cost with reproducible high quality properties in terms of crystallinity, material and dimensions is a prerequisite. LÄS MER

  7. 25. Aesthetical Perspectives in Street Lighting : A Study of Future Potentials in LED Lighting

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för ekonomi, teknik och samhälle

    Författare :Joakim Forsberg; [2016]
    Nyckelord :Street lighting; LED; Aesthetics; Architecture; Interaction design;

    Sammanfattning : As of today, around 19% of all electricity that is produced around the world goes toward lighting roads and cities. The light is also produced in a wasteful manner, creating disturbances in nature as well as for people. LÄS MER