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IMAPS PDC Webinar Series on
Advances in WLED Technologies for Lighting and Backlighting

This two-session on-line Professional Development Course (PDC) webinar will be held:
August-September 2010 (TBD)

All webinars will be held 12:00 pm - 1:30 pm EDT (1.5 Hour Classes Starting Noon EASTERN)

IMAPS Members: $150 per webinar; 2-course series $250
Non-members: $275 per webinar; 2-course series $500 (includes one-year complimentary individual membership in IMAPS)

Registration Deadline: August 2010

Register On-line

Key Words

White LEDs; LED Lighting; LED Backlighting (LED BLU); Silicone; LED Packaging; LED Packaging Materials; Phorsphors

Program Description

Course Introduction:
There are many challenging issues facing white LEDs, although they are being rapidly adopted for backlighting and general lighting applications. An LED production chain, like any semiconductor chain, consists of substrate and other raw materials, front-end and back-end, the general believe that the most difficult technologies and thus the highest investment needed and the highest possible returns are associated with the front-end of the chain, may be no longer true for the LED industry. In fact, in many senses, the white LED technologies are at least as difficult as LED chip technologies, and in fact the state-of-art manufacturing methods for white LEDs make the conventional classification of front-end and back-end parts of LED production chain difficult: is white LED belong to the font-end or back-end, the answer may be different, depending on type of white LED technologies.

In the present seminar series, an overview of white LED technologies for lighting and backlighting, and specific cases studies related to the various challenging issues facing the white LED emitters, will be like presented.

Some of specific topics covered include:

  • Introduction to LED industry (I)
  • Review of white LED technologies (I)
  • An advanced white LED technology for lighting (I)
  • White LED technologies for backlighting (II)
  • Factors affecting WLED performance (II)
    • Effect of phosphor concentration and thickness
    • Effect of phosphor geometries & placement
    • Effect of phosphor geometries & concentration
    • Phosphor characteristics optimization
      • Effects of phosphor particle sizes
  • Opto-Thermal Characteristics of WLED (III)
    • Junction temp. measurement method
    • Junction temp. vs. phosphor concentration
    • Phosphor conversion efficiency vs. phosphor concentration
    • Illumination stability of phosphor-converted WLEDs
    • Novel packaging configuration
      • Layered phosphor placement
  • Thermal management of power LEDs (III)
    • Influence of DAA layer
      • Materials selection
      • Geometry design
    • Novel nano-silver DAA
  • High performance silicone encapsulant for power LEDs (III)
    • Materials properties of developed silicone
    • Packaging performance & reliability tests

Who Should Attend:
This seminar series is intended for engineers & managers in R&D, QA, QC, manufacturing, process development, and advanced technicians who are interested in LED lighting, LED backlighting or general LED technologies.


Dr Frank SHI, is a Professor at Henry Samuli School of Engineering, University of California, Irvine, and a co-founder of Nepes LED Inc. which specializes LED industrial lighting. He obtained his PhD degree from California Institute of Technology, Chemical Engineering & Materials Science in 1992. Dr. Shi directs the Optoelectronics Packaging and Materials Labs at UC Irvine, serving the evolving needs of various industries. His current research interests include: (1) White LED technologies and technologies for the packaging of LEDs and optical devices; and (2) Optoelectronics packaging materials


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