Low Threshold Room Temperature Amplified Spontaneous Emission in 0D, 1D and 2D Quantum Confined Systems
作者： Parva Chhantyal , Suraj Naskar , Tobias Birr , Tim Fischer , Franziska Lübkemann
DOI: 10.1038/S41598-018-22287-9
关键词: Cadmium sulfide 、 Quantum dot 、 Antenna effect 、 Optoelectronics 、 Amplified spontaneous emission 、 Femtosecond 、 Cadmium selenide 、 Nanosecond 、 Nanoparticle 、 Materials science
摘要: We address optical amplification properties of quantum nanoparticles the cadmium selenide/cadmium sulfide (CdSe/CdS) material system with different dimensionality spatial confinement. CdSe/CdS core/shell dots (QDs), rods (QRs) and 5 monolayer thick core/crown nanoplatelets (NPLs) at ambient temperature are considered, exhibiting 0D, 1D 2D confinement electronic system, respectively. Continuous films all these synthesised, amplified spontaneous emission (ASE) spectra measured under femtosecond pumping wavelengths 400 nm 800 nm, The lowest threshold is found for NPLs highest QDs, demonstrating influence rod-like plate-like CdS structures. To emphasize this effect, ASE demonstrated also in QRs nanosecond 355 same films. has been achieved without use any feedback structure, emphazising efficiency antenna effect. fluences observed to be similar, but no QDs up damage nanoparticle layers. length variation investigation resulted gain coefficients 29 cm−1 37 NPLs,
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