Optical Properties of Perovskite-Organic Multiple Quantum Wells.

A comprehensive study of the optical properties of CsPbBr perovskite multiple quantum wells (MQW) with organic barrier layers is presented. Quantum confinement is observed by a blue-shift in absorption and emission spectra with decreasing well width and agrees well with simulations of the confinement energies. A large increase of emission intensity with thinner layers is observed, with a photoluminescence quantum yield up to 32 times higher than that of bulk layers.

Controlling and Optimizing Amplified Spontaneous Emission in Perovskites.

Perovskites are currently attracting extensive research interest as a wavelength-tunable lasing material. As a first step toward electrically pumped lasers, numerous investigations have recently reported amplified spontaneous emission (ASE) of optically pumped perovskites with remarkably low thresholds. Here, we investigate the optical aspects of perovskite ASE, to establish the design principle of materials and devices.

Coherent perfect absorption in wedged organic thin films: a method to determine optical properties.

We investigate coherent perfect absorption in layered thin-film structures with organic small molecules as absorbing material. We focus on strongly asymmetric resonator structures, realized with a high-optical-quality dielectric-distributed Bragg reflector and a thermally evaporated wedged organic layer on top. The optical properties of these devices are systematically investigated by selective optical pumping and probing of the structure along the wedge.