Possible Plasmonic Acceleration of LED Modulation for Li-Fi Applications
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Emerging LED-based wireless visible light communication (Li-Fi) needs faster LED response to secure desirable modulation rates. Decay rate of an emitter can be enhanced by plasmonics, typically by an expense of efficiency loss because of non-radiative energy transfer. In this paper, metal-enhanced radiative and non-radiative decay rates are shown to be reasonably balanced to get with Ag nanoparticles nearly 100-fold enhancement of the decay rate for a blue LED without loss in overall efficacy. Additionally, gain in intensity occurs for intrinsic quantum yield Q0 < 1. With silver, rate enhancement can be performed through the whole visible. For color-converting phosphors, local field enhancement along with decay rate effects enable 30-fold rate enhancement with gain in efficacy. Since plasmonics always enhances decay rate, it can diminish Auger processes thus extending LED operation currents without efficiency droop. For quantum dot phosphors, plasmonic diminishing of Auger processes will improve photostability.
KeywordsWireless visible light communication Li-Fi LED Plasmonics Metal-enhanced electroluminescence Metal-enhanced fluorescence
The work has been supported by BRFFR-TUBITAK no. F16T/A-010 and TUBITAK no. 115E679, and in part by Singapore National Research Foundation under NRF-NRFI2016-08.
- 1.Tanaka Y, Haruyama S, Nakagawa M (2000) Wireless optical transmissions with the white colored LED for the wireless home links. In: Proc of the 11th Int Symp Personal, Indoor and Mobile Radio Communications (London), p 1325–1328Google Scholar
- 4.Tsonev D, Videv S, Haas H (2014) Light fidelity (Li-Fi): towards all-optical networking. Proc SPIE 9007: 900702-1-10Google Scholar
- 5.Geddes CD (ed) (2010) Metal-enhanced fluorescence. Wiley-VHC, WeinheimGoogle Scholar
- 6.Klimov VV (2009) Nanoplasmonics. Fizmatlit, MoscowGoogle Scholar
- 20.Klimov VV, Letokhov VS (2005) Electric and magnetic dipole transitions of an atom in the presence of spherical dielectric interface. Laser Phys 15:61–73Google Scholar
- 22.Sau TK, Rogach AL (eds) (2012) Complex-shaped metal nanoparticles: bottom-up syntheses and applications. John Wiley & Sons, HobokenGoogle Scholar