Extended Short‐Wave Infrared Colloidal Quantum Dot Lasers with Nanosecond Excitation

• DOI: 10.1002/adma.202410207
• Publication Date: 2024-12-06T10:26:58Z
• Authors: Guy L. Whitworth; Carmelita Roda; Mariona Dalmases; Nima Taghipour; Miguel Dosil; Katerina Nikolaidou; Hamed Dehghanpour; Gerasimos Konstan...
• Keywords: Nanosecond; Amplified spontaneous emission; Gain-switching

Abstract Solution‐processed gain media have great technological potential as lasers due to their ease of integration with on‐chip photonics, scalability and tuneable optoelectronic properties. Currently, the spectral coverage solution‐processed extends from visible up telecom wavelengths in short‐wave infrared (SWIR) (<1650 nm). Here, optical extended SWIR 1600 nm 2500 is demonstrated, using PbSbased colloidal quantum dots (CQDs). This region has many applications such LIDAR, biological imaging environmental monitoring currently served by exotic, costly materials limitedscalability. Using CQDs distributed feedback laser cavities, lasing emission tuned between 2150 reported. We show that increased absorption cross‐section larger CQDs, threshold reduced a factor 36 compared smaller‐sized reaching an amplified spontaneous (ASE) down 42 µJ cm −2 . Furthermore, under nanosecond excitation are demonstrated for first time PbS use transient spectroscopy data model thresholds. paves way realizing compact practical CQD potentially toward electrically driven diodes.