Enhanced efficiency of near-UV emitting LEDs for solid state lighting applications

D. Zhu; B. Corbett; B. Roycroft; P. Maaskant; C. McAleese; M. Akhter; M. J. Kappers; C. J. Humphreys

doi:10.1117/12.758799

26 September 2007 Enhanced efficiency of near-UV emitting LEDs for solid state lighting applications

D. Zhu, B. Corbett, B. Roycroft, P. Maaskant, C. McAleese, M. Akhter, M. J. Kappers, C. J. Humphreys

Proceedings Volume 6797, Manufacturing LEDs for Lighting and Displays; 67970O (2007) https://doi.org/10.1117/12.758799
Event: Manufacturing LEDs for Lighting and Display, 2007, Berlin, Germany

Abstract

The performance of a series of near-UV (~385 nm) emitting LEDs, consisting of high efficiency InGaN/AlInGaN QWs in the active region, was investigated. Significantly reduced roll-over of efficiency at high current density was found compared to InGaN/GaN LEDs emitting at a similar wavelength. The importance of optical cavity effects in flip-chip geometry devices has also been investigated. The light output was enhanced by more than a factor of 2 when the light-emitting region was located at an anti-node position with respect to a high reflectivity current injection mirror. A power of 0.49 mW into a numerical aperture of 0.5 was obtained for a junction area of 50 micrometers in diameter and a current of 30 mA, corresponding to a radiance of 30 W/cm2/str.

Citation Download Citation

D. Zhu, B. Corbett, B. Roycroft, P. Maaskant, C. McAleese, M. Akhter, M. J. Kappers, and C. J. Humphreys "Enhanced efficiency of near-UV emitting LEDs for solid state lighting applications", Proc. SPIE 6797, Manufacturing LEDs for Lighting and Displays, 67970O (26 September 2007); https://doi.org/10.1117/12.758799

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