Decay Kinetics of GdAlGaO:Ce Luminescence under Dense Laser Irradiation.

The decay kinetics of GdAlGaO:Ce single crystal luminescence were studied under dense laser excitation. It was shown that the decay times as well as the intensity of Ce luminescence depend on the excitation density. The observed effects were ascribed to the interaction between excitons as well as to the features of energy transfer from the excitons to Ce.

Effects of spatial quantization and Rabi-shifted resonances in single and double excitation of quantum wells and wires induced by few-photon optical field.

We develop a fully quantum theoretical approach which describes the dynamics of Frenkel excitons and bi-excitons induced by few photon quantum light in a quantum well or wire (atomic chain) of finite lateral size. The excitation process is found to consist in the Rabi-like oscillations between the collective symmetric states characterized by discrete energy levels. At the same time, the enhanced excitation of high-lying free exciton states being in resonance with these 'dressed' polariton eigenstates is revealed.

Bright UV-C Phosphors with Excellent Thermal Stability-YScPO Solid Solutions.

The structural and luminescence properties of undoped YScPO solid solutions have been studied. An intense thermally stable emission with fast decay (τ ~ 10 s) and a band position varying from 5.21 to 5.

Design rules for time of flight Positron Emission Tomography (ToF-PET) heterostructure radiation detectors.

Despite the clinical acceptance of ToF-PET, there is still a gap between the technology's performance and the end-user's needs. Core to bridging this gap is the ability to develop radiation detectors combining a short attenuation length and a sub-nanosecond time response. Currently, the detector of choice, LuSiO:Ce single crystal, is not selected for its ability to answer the performance needs, but as a trade-off between requirements and availability.

Perspectives for CdSe/CdS spherical quantum wells as rapid-response nano-scintillators.

We explore the effect of the shell thickness on the time response of CdS/CdSe/CdS spherical quantum wells (SQWs) nanoscintillators under X-ray excitation. We first compare the spectral and timing properties under low and intense optical excitation, which allows us to identify the complex temporal and spectral response of the highly excited species. We find that a defect-induced delayed luminescence appears at large sizes.