Enhancement of Spontaneous Emission from CdSe/CdS/ZnS Quantum Dots at the Edge of the Photonic Band Gap in a Porous Silicon Bragg Mirror

Hybrid systems with luminophores embedded in a matrix attract much interest in areas of sensors and photonic elements. The use of photonic crystals as the matrices allows controlling the propagation and distribution of light emitted by the luminophore, which could improve the sensitivity of sensors and performance of photonic elements. We have investigated the luminescent properties of CdSe/CdS/Zns quantum dots embedded in a porous silicon Bragg mirror using simple technique based on capillary effect. For the first time an angular dependence of the photoluminescence spectrum has been measured. We have found that luminescence spectrum has been found to depend on the shape of the Bragg mirror reflection spectrum. Enhancement of QD PL at the wavelength corresponding to the edge of the photonic band gap of the photonic crystal has been demonstrated.