Spontaneous Emission and Light Extraction Enhancement of Light Emitting Diode Using Partially Reflecting Metasurface Cavity (PRMC)
The enhancement of the power conversion efficiency (PCE) and subsequent reduction of cost, of light emitting diodes (LEDs) is of crucial importance in the current lightening market. For this reason, we propose here a PCE enhanced LED architecture, based on a partially reflecting metasurface cavity (PRMC) structure. This structure simultaneously enhances the light extraction efficiency (LEE) and the spontaneous emission rate (SER) of the LED by enforcing the emitted light to radiate perpendicularly to the device, so as to suppress wave trapping and enhance field confinement near the emitter, while ensuring cavity resonance matching and maximal constructive field interference. The PRMC structure is designed using a recent surface susceptibility metasurface synthesis technique. A PRMC blue LED design is presented and demonstrated by full wave simulation to provide LEE and SER enhancements by factors 4.0 and 1.9, respectively, which correspond to PCE enhancement factors of 6.2, 5.2 and 4.5 for IQEs of 0.25, 0.5 and 0.75, respectively, suggesting that the PRMC concept has a promising potential in LED technology. (c) 2016 Optical Society of America OCIS codes: (160.3918) Metamaterials; (230.3670) Light emitting diodes; (270.0270) Quantum optics. References and links 1. Stephen Pearton, ed. GaN and ZnO based Materials and Devices (Springer, 2012) 2. H. Y. Ryu, "Modification of internal quantum efficiency and efficiency droop in GaN based flip chip lightemitting diodes via the Purcell effect," Opt. Express 23(19) A1157 A1166 (2015) 3. G. Y. Shiu, K. T. Chen, F. H. Fan, K. P. Huang, W. J. Hsu, J. J. Dai, C. F. Lai, and C. F. Lin, "InGaN Light Emitting Diodes with an Embedded Nanoporous GaN Distributed Bragg Reflectors," Sci. Rep. 6, 29138 (2016) 4. M. H. 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