Design of Al-rich AlGaN quantum well structures for efficient UV emitters

Mitsuru Funato; Shuhei Ichikawa; Kyosuke Kumamoto; Yoichi Kawakami

doi:10.1117/12.2254797

16 February 2017 Design of Al-rich AlGaN quantum well structures for efficient UV emitters

Mitsuru Funato, Shuhei Ichikawa, Kyosuke Kumamoto, Yoichi Kawakami

Proceedings Volume 10104, Gallium Nitride Materials and Devices XII; 101040I (2017) https://doi.org/10.1117/12.2254797
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

The effects of the structure design of AlGaN-based quantum wells (QWs) on the optical properties are discussed. We demonstrate that to achieve efficient emission in the germicidal wavelength range (250 – 280 nm), Al_xGa_1−xN QWs in an Al_yGa_1−yN matrix (x < y) is quite effective, compared with those in an AlN matrix: Time-resolved photoluminescence and cathodoluminescence spectroscopies show that the Al_yGa_1−yN matrix can enhance the radiative recombination process and can prevent misfit dislocations, which act as non-radiative recombination centers, from being induced in the QW interface. As a result, the emission intensity at room temperature is about 2.7 times larger for the Al_xGa_1−xN QW in the Al_yGa_1−yN matrix than that in the AlN matrix. We also point out that further reduction of point defects is crucial to achieve an even higher emission efficiency.

Citation Download Citation

Mitsuru Funato, Shuhei Ichikawa, Kyosuke Kumamoto, and Yoichi Kawakami "Design of Al-rich AlGaN quantum well structures for efficient UV emitters", Proc. SPIE 10104, Gallium Nitride Materials and Devices XII, 101040I (16 February 2017); https://doi.org/10.1117/12.2254797

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