Determining the thermal load of phosphor-converted LEDs by an iterative optical and thermal simulation procedure
(Conference Presentation)

Wolfgang Nemitz; Paul Fulmek; Johann Nicolics; Franz-Peter Wenzl

doi:10.1117/12.2237680

7 November 2016 Determining the thermal load of phosphor-converted LEDs by an iterative optical and thermal simulation procedure (Conference Presentation)

Wolfgang Nemitz, Paul Fulmek, Johann Nicolics, Franz-Peter Wenzl

Author Affiliations +

Proceedings Volume 9953, Optical Modeling and Performance Predictions VIII; 99530C (2016) https://doi.org/10.1117/12.2237680
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

In this contribution we discuss a combined optical and thermal simulation approach which allows us to model the thermal load of the phosphor elements of phosphor converted LED packages with high accuracy. It relies on iterative optical and thermal simulations using ASAP, which is a ray-tracing tool, for the optical simulation parts and the open-source-software gmsh/GetDP for the thermal simulations. The simulation procedure starts with the determination of the absorption intensity of the blue LED light within the phosphor layer. This absorption intensity is the input parameter for the first thermal simulation step. The thermal simulation provides the temperature distribution inside the phosphor layer which again is the input parameter for the next optical simulation step. This iterative combination of optical and thermal simulations allows to consider also the temperature dependency of the optical properties (temperature dependent luminescence loss of the phosphor, thermo-optic coefficients…) of the respective materials. The consideration of temperature induced effects is a prerequisite for an accurate simulation of the optical performance of phosphor converted LEDs, like the CCT values or temperature induced color shifts upon operation. The iteration procedure is continued until the simulated temperature distribution of the phosphor layer becomes stable which is one possible stop criterion. The simulations are verified by experimental characterisation of LED packages fabricated in accordance with the simulation model. We show that using such an iterative simulation approach allows a much more appropriate prediction of the thermal load of phosphor converted LEDs than simple thermal simulations do.

Conference Presentation

Citation Download Citation

Wolfgang Nemitz, Paul Fulmek, Johann Nicolics, and Franz-Peter Wenzl "Determining the thermal load of phosphor-converted LEDs by an iterative optical and thermal simulation procedure (Conference Presentation)", Proc. SPIE 9953, Optical Modeling and Performance Predictions VIII, 99530C (7 November 2016); https://doi.org/10.1117/12.2237680

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Optical simulations

Thermography

Light emitting diodes

Absorption

Temperature metrology

Blue light emitting diodes

Geometrical optics

Show All Keywords

Keywords/Phrases

Search In:

Publication Years