Theoretical analysis of optical gain and exciton effect in GaN/AlGaN quantum wells

Takeshi Uenoyama; Masakatsu Suzuki

doi:10.1117/12.275617

6 June 1997 Theoretical analysis of optical gain and exciton effect in GaN/AlGaN quantum wells

Takeshi Uenoyama, Masakatsu Suzuki

Proceedings Volume 2994, Physics and Simulation of Optoelectronic Devices V; (1997) https://doi.org/10.1117/12.275617
Event: Photonics West '97, 1997, San Jose, CA, United States

Abstract

Optical gains of wurtzite GaN/AlGaN quantum wells have been studied by a first-principles calculation and the k.p method. Most of the parameters in the k.p method were determined by fitting the band structures to the first- principles calculation. Owing to the small spin-orbit splitting energies and the strong electronegativity, the large hole density of states causes the higher threshold current density of the wurtzite GaN/AlGaN quantum well lasers. Then, we have proposed a new mechanism of the optical gain for laser diodes, using a localized level and the excitonic effects. The excitonic effects enhance an oscillator strength of the optical transition. When a localized level is exist in the band-gap, the optical gain between the localized state and one of the band edge states is produced with the very small carrier density. This optical gain is enhanced by the excitonic effect a the band edges and it might show a possibility of very low threshold current density for wide-gap laser diodes.

Citation Download Citation

Takeshi Uenoyama and Masakatsu Suzuki "Theoretical analysis of optical gain and exciton effect in GaN/AlGaN quantum wells", Proc. SPIE 2994, Physics and Simulation of Optoelectronic Devices V, (6 June 1997); https://doi.org/10.1117/12.275617

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