Ms. Tanja Mesli Profile

Tanja Mesli

at odelo LED GmbH

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 28 September 2007 Paper

Improvement of ultra-high-brightness white LEDs

Tanja Mesli

Proceedings Volume 6797, 67970N (2007) https://doi.org/10.1117/12.768084

KEYWORDS: Light emitting diodes, Europium, YAG lasers, RGB color model, Quantum efficiency, Luminescence, Light sources and illumination, Temperature metrology, Light, Blue light emitting diodes

Read Abstract +

As LEDs became the preferred light source for coloured light, the focus is now on improving the performance of white LEDs, to achieve the required levels for applications such as general lighting. One especially interesting automotive application of white LEDs are daytime running lights, which may become mandatory in the near future in Europe. In this application the specific advantages of LEDs like long lifetime, high efficiency, robustness and freedom for the designers can be fully employed. The most common way to realize a white LED is the approach of a luminescence conversion LED, where blue light of a GaN Chip is partly transformed into yellow light by a phosphor. The combination of the not converted blue and the yellow light results in white light. A strong increase of the luminous flux becomes possible by the use of High Power LED Chips, high efficient yellow phosphors and a packaging that offers an excellent thermal management. First of all, the application of a High Power LED Chip allows an increase of the electrical current up to 1 Ampere. While this increases the light output significantly, the thermal management of the LED package has to be improved in order to remove the heat created by the LED chip. Apart from chip efficiency and driving current the brightness of a white LED also strongly depends on the efficiency of the used phosphor. Today's typically used phosphors are for example YAG:CE, or with Europium 2+ doped compounds. The required quantum efficiency should be higher than 90% for good results in the luminous efficiency. Furthermore, for certain applications such as automotive front lighting the converter even has to be stable under temperature conditions up to 120°C, be resistant to humidity and guarantee a long lifetime. In this contribution we will present a comparison of several different types of phosphors with emphasis on their temperature dependent behaviour.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

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:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years