Amplified Spontaneous Emission from InP/ZnS Colloidal Quantum Dots

Abstract

Indium phosphide (InP) colloidal quantum dots (CQDs) have received attention because of their lower toxicity than that of cadmium-based CQDs. Quantum dot light emitting diodes (QLEDs) have been studied and developed rapidly by many research groups because QLED displays are one of the most important applications of InP CQDs. On the other hand, lasing from InP-based quantum dots has many issues that need to be resolved for real applications. Using nanosecond optical pumping pulses, we observe amplified spontaneous emission from an InP CQD thin film with 450 nm thickness deposited on glass grating structure.