Abstract
White light-emitting diodes (WLEDs) have the great potential to make a tremendous impact on energy consumption throughout the world. Unfortunately, conventional WLEDs phosphors utilize expensive rare-earth elements (REEs) and the rare-earth mining, refining and disposal bring extremely high environmental cost. Therefore, the development of eco-friendly phosphors that are free of REEs and toxic metals has been one of the challenges for the next-generation light sources [1]. Although in recently developed technique quantum dots (QDs) and nanocrystals (NCs) have been considered as promising alternatives, the strong quantum confinement effect in these nanoscale materials causes their efficient excitation wavelength to be limited in UV region [2,3]. This limitation severely impedes their integration with commercial blue LEDs to fabricate high luminous efficacy WLEDs.
© 2015 IEEE
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