50 research outputs found
Skills per la promozione delle vaccinazioni negli operatori sanitari: risultati di una indagine CAP tra i medici competenti.
Full-color tuning in binary polymer: perovskite nanocrystals organic-inorganic hybrid blends
ISSN:0003-6951ISSN:1077-311
Temperature Dependence of the Amplified Spontaneous Emission from CsPbBr3 Nanocrystal Thin Films
Cesius lead halide perovskite colloidal nanocrystals are among the most promising perovskite systems for light-emitting devices applications due to their high fluorescence quantum yield and high optical gain at room temperature. In this letter, we report on the first investigation of temperature dependence of amplified spontaneous emission (ASE) properties of thin films of CsPbBr3 nanocrystals. We demonstrate that ASE is strongly temperature-dependent, with a complex variation in temperature of the ASE intensity, threshold, and peak wavelength. The joint investigation of the photoluminescence (PL) spectra below and above the ASE threshold allows us to conclude that the temperature increase results in the formation of disordered subdomains emitting in the low-energy tail of the PL spectra, leading to the existence of three emission regimes with transitions at about 90 and 170 K, with individually different temperature dependences
Efficacy and Safety of Taspoglutide Monotherapy in Drug-Naive Type 2 Diabetic Patients After 24 Weeks of Treatment: Results of a randomized, double-blind, placebo-controlled phase 3 study (T-emerge 1)
Studio preliminare della vascolarizzazione della mammella mediante doppler cw nella patologia oncologica
Full-color tuning in binary polymer:perovskite nanocrystals organic-inorganic hybrid blends
The excellent optical and electronic properties of metal halide perovskites recently proposed these materials as interesting active materials for optoelectronic applications. In particular, the high color purity of perovskite colloidal nanocrystals (NCs) had recently motivated their exploration as active materials for light emitting diodes with tunable emission across the visible range. In this work, we investigated the emission properties of binary blends of conjugated polymers and perovskite NCs. We demonstrate that the emission color of the blends is determined by the superposition of the component photoluminescence spectra, allowing color tuning by acting on the blend relative composition. The use of two different polymers, two different perovskite NCs, and different blend compositions is exploited to tune the blend color in the blue-green, yellow-red, and blue-red ranges, including white light generation