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Abstract. The influence of phonon and electron reservoirs on the spectral emission from a quantum-dot cavity system is investigated. The line shapes strongly depend on the energy dependence of the exciton self-energy function, that in turn depends on the tunneling rate. This allows one to control the light emission from a single quantum dot. IntroductionQuantum information technology requires the development of light sources, in which the photon number can be carefully controlled. Single photons can be generated through laser excitation [1][2][3][4][5]. However, for practical applications the electrical excitations are more preferable, and electro-luminescence from a single quantum dot (QD) within the intrinsic region of a p-i-n junction has been shown to act as an electrically driven single-photon source [6]. Quantum dots are embedded in a surrounding solid, and the carriers confined to the dot interact with their environment most notably with phonons. To control the spectral emission from exciton quantum dots the system can be coupled also to the electron reservoir. The additional interaction with the electron reservoirs can have a significant effect on the self-energy function of the semiconductor QD and its emission. In this paper, we show that the total self-energy function depends on the tunneling rate which by itself depends on the temperature, highness and thickness of the barrier, energy levels of the QD and the chemical potential of the lead. At the fixed thickness of the barrier between the QD and the lead, the tunneling rate Γ can be changed by tuning the voltage on the gate. This means that the spectral emission from the QD can be controlled.