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A high-performance white-light-emitting-diodes based on nano-single crystal divanadates quantum dots.

  • Author(s): Yang, Weiqing
  • Liu, Zhongli
  • Chen, Jun
  • Huang, Li
  • Zhang, Lei
  • Pan, Hong
  • Wu, Bo
  • Lin, Yuan
  • et al.

Published Web Location

https://doi.org/10.1038/srep10460
Abstract

We report a high-performance phosphors-free white light-emitting-diodes (w-LEDs) using Ba2V2O7 or Sr2V2O7 quantum dots that directly heteroepitaxially grown on common quartz substrates by polymer assisted deposition (PAD). The quantum efficiency of quantum dots is as high as 95%. More importantly, electronic local functions, band structure and partial density of states have been firstly calculated to study the luminescent and heteroepitaxial growth mechanisms by the Ab-initio Simulation. Additionally, the glaring white light excited at a wavelength of 325 nm was experimentally observed, which unambiguously demonstrated that such quantum dots can be efficient w-LEDs for solid state lighting.

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