Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7906466 | Optical Materials | 2018 | 9 Pages |
Abstract
Intensive research has been carried out on optical properties of MoS2 quantum dots for versatile applications in photo catalytic, sensing and optoelectronic devices. However, white light generation from MoS2 quantum dots particularly using doping effect is relatively unexplored. Herein we report successful synthesis of Europium (Eu)/Terbium (Tb) co-doped MoS2 quantum dots to achieve white light for potential applications in optoelectronic devices. The dopant ions are introduced into the host lattice to retain the emission colors to cover the entire range of visible light of solar spectrum. Perfect white light (CIEâ¯=â¯0.31, 0.33) with high intensity (quantum yieldâ¯=â¯28.29%) is achieved in these rare earth elements co-doped quantum dot system. A new peak is observed in the NIR region which is attributed to the defects present in MoS2 quantum dots. Temperature dependent study has been carried out to understand the origin of this new peak in the NIR region. It is seen that the 'S' defects in the QDs cause the appearance of this peak which shows a blue shift at higher temperature.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Dhrubaa Haldar, Arnab Ghosh, Saptasree Bose, Supriya Mondal, Uttam Kumar Ghorai, Shyamal K. Saha,