Budapest University of Technology and Economics, Faculty of Electrical Engineering and Informatics

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    Application of Power LEDs

    A tantárgy neve magyarul / Name of the subject in Hungarian: Teljesítmény LED-ek alkalmazástechnikája

    Last updated: 2018. május 5.

    Budapest University of Technology and Economics
    Faculty of Electrical Engineering and Informatics
    Branch of Electrical Engineering
    Branch of Software Engineering
    Elective subject
    Course ID Semester Assessment Credit Tantárgyfélév
    VIEEAV09   2/0/0/f 2  
    3. Course coordinator and department Dr. Poppe András, Elektronikus Eszközök Tanszéke
    4. Instructors



    Department, Institute:

    Dr. András Poppe

    Associate Professor

    Department of Electron Devices

    Dr. Zoltán Tóth

    GE Hungary

    5. Required knowledge

    Microelectronics (operation of pn-junctions), physics

    6. Pre-requisites
    NEM ( TárgyEredmény( "BMEVIEEM357" , "jegy" , _ ) >= 2
    TárgyEredmény("BMEVIEEM357", "FELVETEL", AktualisFelev()) > 0)

    A fenti forma a Neptun sajátja, ezen technikai okokból nem változtattunk.

    A kötelező előtanulmányi rendek grafikus formában itt láthatók.


    Microelectronics (VIEEA306/VIEEAB00)

    7. Objectives, learning outcomes and obtained knowledge

    The goal of the subject is to provide up-to-date knowledge about the most modern light sources, the high power (high brightness) light emitting diodes as semiconductor devices aimed as light sources. Information regarding the major operating characteristics, device construction, manufacturing, reliability and lifetime as well as knowledge regarding thermal, electrical and optical requirements imposed by applications is provided to the extent needed for system level design of LED based lighting applications or for operating such installations. Most important standards (product standards, testing standards) are also discussed. This subject is complementary to other lighting related subjects taught at BME.

    8. Synopsis

    components in lighting applications. The topics covered by the subject belong to four basic categories. The first part discuesses the basic properties of light and light sources to the extent needed to understand the different characteristics of LEDs. The highest emphases is put on the physics and construction issues of LEDs and LED-based applications. The third part of the subject covers different solid-state lighting applications from the point of view of requirements against the LEDs used. Special attention is paid to the thermal issues which influence LED operation the most.

    Weekly schedule:


    Week 1:         Basic properties of light and human vision. Overview of basic quantities used in lighting (e.g. radiant flux, luminous flux, solid angle, illumination). Overview of different light sources (black body radiators, gas discharge lamps, solid-state light sources (LEDs, OLEDs).

    Week 2:         Overview of the operation of LEDs as pn-junctions. Recombination processes. I-V characteristics of LEDs: ideal characteristic, effect of the electrical series resistance. Spectral power distribution of different LED types: color LEDs, phosphor converted white LED.

    Week 3:         Different compound material systems used in LEDs. Efficiency and efficacy of LEDs. Device constructions assuring high efficiency/efficacy.

    Week 4:         Laboratory testing of LEDs (measurement of light output properties and thermal properties). The latest LED testing standards and technical recommendations (CIE, JEDEC).  Temperature dependence of LED operation. Test based multi-domain modeling of LEDs.

    Week 5:         Production (in-line) testing of LEDs, binning. Packaging issues of LEDs, assembly issues; level 1, 2, 3, 4 devices: LED chip, packaged LED chip, packaged LED chip assembled to a substrate, substrate with a packaged LED on a cooling assembly.

    Week 6:         LED reliability. Reliability and life-time test of LEDs; end-of-life prediction (LM80 and TM21 standards), major failure modes.

    Week 7:                  Construction issues of thermal management solutions for LED applications (heat-sinks, thermal interface materials), Thermal analysis of LED applications on luminaire level, CFD modeling and simulation.  

    Week 8:         Retrofit LED bulbs (retrofit applications). Major application areas of LED light sources: automotive, indoor, outdoor, backlight modules, special applications (e.g. museum lighting); special requirements against LEDs imposed by the applications.

    Week 9:         LED modules. The Zhaga standard. Introduction to LED based lighting applications at industrial site visit (GE)

    Week 10:   Some issues of electrical design for LED applications (e.g. LED drivers, dimming). AC driven LEDs.

    Week 11:   Visual comfort of LED based solutions (such as color rendering, color fidelity, glare). Photo-biological effects of LED lighting (effects of blue light).

    Week 12:   Organic light emitting devices (OLEDs): overview of operation, device construction, modeling issues, applications

    Week 13:   Laboratory visit (introduction of typical test equipment like an integrating sphere, a goniometer or a thermal test equipment).

    Week 14: Reserve

    9. Method of instruction

    2 hours/week lectures.

    10. Assessment

    a. One mid-semester test on the last week

    b. Requirement for granting the mark: mid-semester check grade >= 2 (satisfactory)

    c. Mid-term grade: mid-semester check grade modified by the additional points of the optionally submitted homework

    The students’ task is to familiarize themselves with the following topics:

    Laboratory qualification measurements of LEDs (measurement of photometric properties, measurement of thermal properties). Overview of the latest recommendations and standards (CIE, JEDEC). Temperature dependence of LEDs, multi-domain modeling of LEDs based on measurements.

    Design of thermal environments for LED applications (heat sinks, thermal interfacial materials), LED lighting solutions, CFD modeling and simulation.

    The necessary knowledge can be obtained by processing the appropriate chapters of the following book: Clemens Lasance - András Poppe: Thermal Management for LED Applications, Springer (2014) (Also available in e-book format.)

    11. Recaps One repeated tests in the repeat period. In principle there is no second repeat for the failed mid-term test.
    12. Consultations

    Consultations are held on-demand after appointment with the lecturer.

    13. References, textbooks and resources

    1)   E. Fred Schubert: Light-emitting diodes (2nd ed), Cambridge University Press (2006).

    2)   Clemens Lasance - András Poppe: Thermal Management for LED Applications, Springer (2014) (available also as an e-book.)

    3)   CIE technical reports, JEDEC JESD51-5x series of standards

    4) Technical papers selected from jornals and conferences

    14. Required learning hours and assignment



    Preparation for lectures


    Preparation for practices


    Preparation for laboratories


    Preparation for midterms




    Literature review


    Preparation for exam




    15. Syllabus prepared by



    Department, Institute:

    Dr. András Poppe

    Associate Professor

    Department of Electron Devices

    Dr. Zoltán Tóth

    GE Hungary