Abstract

In this work, III-nitride based 370  nm UVA light-emitting diodes (LEDs) grown on Si substrates are demonstrated. We also reveal the impact of the AlN composition in the AlGaN quantum barrier on the carrier injection for the studied LEDs. We find that, by properly increasing the AlN composition, both the electron and hole concentrations in the multiple quantum wells (MQWs) are enhanced. We attribute the increased electron concentration to the better electron confinement within the MQW region when increasing the AlN composition for the AlGaN barrier. The improved hole concentration in the MQW region is ascribed to the reduced hole blocking effect by the p-type electron blocking layer (p-EBL). This is enabled by the reduced density of the polarization-induced positive charges at the AlGaN last quantum barrier (LB)/p-EBL interface, which correspondingly suppresses the hole depletion at the AlGaN LB/p-EBL interface and decreases the valence band barrier height for the p-EBL. As a result, the optical power is improved.

© 2017 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
On the origin of enhanced hole injection for AlGaN-based deep ultraviolet light-emitting diodes with AlN insertion layer in p-electron blocking layer

Chunshuang Chu, Kangkai Tian, Jiamang Che, Hua Shao, Jianquan Kou, Yonghui Zhang, Yi Li, Meiyu Wang, Youhua Zhu, and Zi-Hui Zhang
Opt. Express 27(12) A620-A628 (2019)

Establishment of the relationship between the electron energy and the electron injection for AlGaN based ultraviolet light-emitting diodes

Zi-Hui Zhang, Kangkai Tian, Chunshuang Chu, Mengqian Fang, Yonghui Zhang, Wengang Bi, and Hao-Chung Kuo
Opt. Express 26(14) 17977-17987 (2018)

Improving hole injection efficiency by manipulating the hole transport mechanism through p-type electron blocking layer engineering

Zi-Hui Zhang, Zhengang Ju, Wei Liu, Swee Tiam Tan, Yun Ji, Zabu Kyaw, Xueliang Zhang, Namig Hasanov, Xiao Wei Sun, and Hilmi Volkan Demir
Opt. Lett. 39(8) 2483-2486 (2014)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription