High-power extraction of 340- to 350-nm UV LEDs

Toshio Nishida; Tomoyuki Ban; Hisao Saito; Naoki Kobayashi; Toshiki Makimoto

doi:10.1117/12.524560

6 July 2004 High-power extraction of 340- to 350-nm UV LEDs

Toshio Nishida, Tomoyuki Ban, Hisao Saito, Naoki Kobayashi, Toshiki Makimoto

Proceedings Volume 5359, Quantum Sensing and Nanophotonic Devices; (2004) https://doi.org/10.1117/12.524560
Event: Integrated Optoelectronic Devices 2004, 2004, San Jose, CA, United States

Abstract

The potential of high power extraction from AlGaN-based ultraviolet light emitting diodes (UV-LEDs) is described. Improvements of UV-LEDs are shortly introduced from the viewpoints of nitride epitaxial growth, heterostructure optical characteristics based on the internal polarization field, and p-n junction design. The UV light extraction enhancement by utilizing the GaN-free transparent UV-LED structure and highly efficient UV-LEDs fabricated by introducing a high-quality AlN template on sapphire substrate are described. The maximum output powers are 8.6 mW and 5.5 mW at an injection current of less than 150 mA, at the emission wavelength of 350 nm and 340 nm, respectively. The highest external quantum efficiencies are 2.2 and 1.7%, respectively. The application to white lighting and the potential of the high-flux UV-extraction utilizing bulk AlN substrate are also investigated.

Citation Download Citation

Toshio Nishida, Tomoyuki Ban, Hisao Saito, Naoki Kobayashi, and Toshiki Makimoto "High-power extraction of 340- to 350-nm UV LEDs", Proc. SPIE 5359, Quantum Sensing and Nanophotonic Devices, (6 July 2004); https://doi.org/10.1117/12.524560

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