Enhanced Optical Performance and Thermal Stability of Quantum Dot Converters for Laser Source

Quantum dots (QDs) are a revolution in the field of photoelectric and have a crucial potential for future applications as a color converter in micro/mini- LEDs. However, the reported QD converter efficiency (-20-40%) has not reached the level on par with that of the conventional phosphor color converters (~40-60%). In this study, we fabricate the QD nanowires (NWs) templated in the nanoporous anodic aluminum oxide (AAO) substrate using a combination of inkjet printing and vacuum-deposition. Owing to the light couple and waveguide effect of the nanopores cavity structure, we demonstrate a 1.25-fold enhancement in the luminous flux and a 2.04-fold increase in the photoluminescence (PL) intensity compared with the traditional QD planar converter. Furthermore, the stability test showed a 2.34 times improvement in lifetime resulting from the heat dissipation and moisture protection of the nanopores. The inkjet printing fabrication strategy combined with the nanostructure provides new insights for mass-produce high-quality QD NWs, which is promising for modern lighting applications in the micro/mini-lighting-emitting diodes (LEDs).