1 / 3

FIG. 4. Electroluminescence spectra of (a) Sample A (with shallow TQW), (b) Sample B

1.8 nm. 2.1 nm. FIG. 4. Electroluminescence spectra of (a) Sample A (with shallow TQW), (b) Sample B (with shallow RQW), (c) Sample C (w/o. shallow QWs) at Various injection currents. (d) The magnitude of the blue-shift and the FWHM of the EL emission peak in the

aretha-anthony
Télécharger la présentation

FIG. 4. Electroluminescence spectra of (a) Sample A (with shallow TQW), (b) Sample B

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 1.8 nm 2.1 nm FIG. 4. Electroluminescence spectra of (a) Sample A (with shallow TQW), (b) Sample B (with shallow RQW), (c) Sample C (w/o. shallow QWs) at Various injection currents. (d) The magnitude of the blue-shift and the FWHM of the EL emission peak in the three samples as a function of injection current. 5.1 nm

  2. Conclusion • The LED devices with shallow TQW gave a 0.35 V lower turn-on voltage and an 80% higher lighting efficiency than those of LEDs without shallow QWs. • The improvements were ascribed to the weakening effect of the inserted shallow TQW on the polarization field in the c-plane GaN-LEDs, leading to enhanced lighting efficiency and reduced efficiency-droop.

  3. References (1)E. F. Schubert and J. K. Kim, Science 308, 1274 (2005). (2)S. Huang, Y. Xian, B. Fan, Z. Zheng, Z. Chen, W. Jia, H. Jiang, and G.Wang, J. Appl. Phys. 110, 064511 (2011). (3)M.-H. Kim, M. F. Schubert, Q. Dai, J. K. Kim, E. F. Schubert, J. Piprekand Y. Park, Appl. Phys. Lett. 91, 183507 (2007). (4)S. J. Chang, S. C. Wei, Y. K. Su, and W. C. Lai, J. lectrochem. Soc. 154,H871 (2007).

More Related