Study of photoluminescence lifetime of Pentacene on PZN-PT nanoparticles in phosphorus gel matrix thin films

The present work proposes a new way to obtain stable ferroelectric oxide perovskites with large photoluminescence and very long and stable lifetime, beyond that of halogenated perovskites, and requiring only ferroelectric nanoparticles, dispersed in thin layers of phosphoric based gel. A protective pentacene thin film was deposited on top of the samples. Its typical red-NIR emission band around 650-750 nm was detected under excitation at 320 nm. In addition to this, a broad visible emission band was observed and became dominant under excitation at around 380 nm, which is attributed to the perovskite nanoparticles.

The influence of Mn doping was tested. Consistently, the doping produced an increase of emission intensity for both the pentacene and the perovskite nanoparticles. In the first case with an intensity ratio between 2.3 - 7.7, while, for the perovskites, the emission intensity increased in the range of a ration of 1.6 - 3.1, clearly showing that Mn doping improves the emission intensity.