Fakultät Allgemeinwissenschaften und Mikrosystemtechnik
Modulbeschreibung Master of Electrical and Microsystems Engineering V2M: LED Technology (LED, LED Technology)
Description:
In nearly any application area, light-emitting diodes (LED) enormously gained in importance in the last years. The main reason for this is the brightness increase that has been reached over the last decade, and the brightness is still growing. The media are reporting frequently about new records with LEDs, not only about brightness but also about efficiency, package size, and lifetime.
This course describes the creation of an LED, its properties and peculiarities, and reasons for the brightness increase. LEDs will not only be shown from a production point of view but particularly
with regard to their application. We have a look at application conditions, the resulting requirements to an LED, and the necessary electrical, thermal, and optical design.
Content:
Content:
• Basics, fundamental terms
Color triangle, saturation, dominant / peak wavelength
Photometrical and radiometrical values, Candela, Lumen
Spectrum, “Color”, “White”, CRI, Color temperature
• Chip technology, fundamental properties
TSN, InGaAlP, InGaN
• Energy band model / wavelength areas
• Substrates
Chip production
Electrical, optical, and thermal properties
Chip size / current density / ‘low current’ types
Light extraction
• Package technology
Leaded, premolded, molded, …
Requirements
• Solderability, SSLT, …
• ESD stability, ESD protection
Aging, lifetime
• LED production
Assembly
Testing, binning
Measuring accuracy and tolerances
• White light with LEDs
RGB
• Pros and cons
White conversion
• Properties, realization
• Volume conversion, chip level conversion
• Color homogeneity, white impression
• White <-> warm white
• Conversion
Phosphors and their properties
Non saturated colors
Full conversion
• Application of LEDs
General aspects
• Current feed, derating
• Durableness
• Eye safety
Automotive
• Interior / exterior, requirements, solutions#
Projection
Back light units
• SRGB, Adobe
• RGB- / conversion solutions
• New opportunities: sequential coloring
Flash
General lighting
• Special requirements
• New solutions / Retrofits
Literatur:
• None
Type of lecture: Lecture, Seminar
Duration: 4 semester hours
Credits: 5 CP according to ECTS
Work load: Lecture = 42 h;
Post processing = 21 h
Seminar work 24 h, Exam preparation 40 h, Exam duration 1,5 h; In total: 128,5 h Lecturer: Prof. Dr. Rupert Schreiner
