Belépés címtáras azonosítással
magyar nyelvű adatlap
angol nyelvű adatlap
Application of Power LEDs
A tantárgy neve magyarul / Name of the subject in Hungarian: Teljesítmény LED-ek alkalmazástechnikája
Last updated: 2018. május 5.
Dr. András Poppe
Department of Electron Devices
Dr. Zoltán Tóth
Microelectronics (operation of pn-junctions), physics
A fenti forma a Neptun sajátja, ezen technikai okokból nem változtattunk.
A kötelező előtanulmányi rendek grafikus formában itt láthatók.
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.
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
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).
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.
Different compound material systems used in LEDs.
Efficiency and efficacy of LEDs. Device constructions assuring high
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.
(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.
reliability. Reliability and life-time test of LEDs; end-of-life prediction (LM80
and TM21 standards), major failure modes.
Construction issues of thermal
management solutions for LED applications (heat-sinks, thermal interface
materials), Thermal analysis of LED applications on luminaire level, CFD modeling
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.
LED modules. The Zhaga standard. Introduction
to LED based lighting applications at industrial site visit (GE)
Some issues of electrical design for LED applications (e.g.
LED drivers, dimming). AC driven LEDs.
Visual comfort of LED based solutions (such as color
rendering, color fidelity, glare). Photo-biological effects of LED lighting (effects
of blue light).
Organic light emitting devices (OLEDs): overview of
operation, device construction, modeling issues, applications
Laboratory visit (introduction of typical test equipment
like an integrating sphere, a goniometer or a thermal test equipment).
Week 14: Reserve
2 hours/week lectures.
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.)
Consultations are held on-demand after appointment with the lecturer.
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
Preparation for lectures
Preparation for practices
Preparation for laboratories
Preparation for midterms
Preparation for exam