Wiesmann, Christopher and Bergenek, Krister and Houdre, Romuald and Stanley, Ross P. and Linder, Norbert and Schwarz, Ulrich T. (2009) Theoretical Investigation of the Radiation Pattern From LEDs Incorporating Shallow Photonic Crystals. IEEE JOURNAL OF QUANTUM ELECTRONICS, 45 (10). pp. 1273-1283. ISSN 0018-9197, 1558-1713
Full text not available from this repository. (Request a copy)Abstract
A theoretical approach based on coupled-mode theory is presented in order to determine the radiation pattern of LEDs incorporating a shallow photonic crystal. From this, a fundamental limit for the directionality of the diffraction of a single guided mode is given. Additionally, the Fabry-Perot resonances are shown to have significant impact on the directionality of diffracted light. For a realistic green-emitting InGaN LED in thin-film configuration the optimum reciprocal lattice vector is derived in terms of absolute diffracted intensity and directionality within a limited acceptance angle. The latter can be as high as 1.8 times the directionality of a Lambertian emitter. Furthermore, the spontaneous emission distribution between guided modes heavily influences the diffracted intensity.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LIGHT-EMITTING-DIODES; HIGH EXTRACTION EFFICIENCY; SPONTANEOUS EMISSION; Coupled-mode theory; diffraction; LEDs; photonic crystals (PhCs) |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Ulrich Schwarz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Sep 2020 05:09 |
| Last Modified: | 04 Sep 2020 05:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/28345 |
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