Spontaneous Light Emission from Molecular Junctions: Theoretical Analysis of Upconversion Signal

Abstract

The Liouville space algebraic expression for the current-induced fluorescence can be written down readily 1 from the double-sided diagram shown in Fig. (1a). We get, S (1) (ω s) = 1 h 4 Re iα |T iα | 2 t −∞ dτ e −iωs(t−τ) τ −∞ dτ 1 τ −∞ dτ 2 e ī h α(τ2−τ1) f α (α) Tμ † sR (t)μ sL (τ)ĉ † iL (τ 1)ĉ iR (τ 2) (1

Single-molecule nano-optoelectronics: insights from physics

“…It refers to the phenomenon where the low-energy excited electrons transit to an excitation energy level higher than the initial excitation energy through a certain channel to achieve high-energy photon emission. Up-conversion luminescence can result in a blue shift of the luminescence peak, just like hot electroluminescence [313]. For instance, up conversion electroluminescence from 1.7 eV excitation to 1.81 eV emission is observed in monophthalocyanine molecules [239].…”

Energy, Particle, and Photon Fluxes in Molecular Junctions

“…The optical response of molecular junctions has been measured , and studied theoretically with both perturbative − and nonperturbative techniques . In particular, current-induced spontaneous emission from molecular junctions, known as electroluminescence, has been of interest − due to its applications to optoelectronic devices and in understanding the fundamental physics of light–matter interaction in nonequilibrium systems.…”

“…For the spontaneous light emission signal, we set n (ω s ) = 0 and obtain where S (ω s ) is the photon flux in field mode ω s , which is identified as the spontaneous spectroscopic signal intensity at frequency ω s and was employed recently to compute the electroluminescence from a molecular junction.…”