Enhanced luminescence stability of quantum dot-based inorganic nanocomposite particles for white-light-emitting diodes

We have synthesized quantum dot (QD)-embedded inorganic nanocomposites by effective combination of spray pyrolysis and subsequent sal-gel processing. The rapid depression of emission intensity of QDs just after addition of ammonia for sal-gel processing was effectively retarded by intermediate addition of boron alkoxide to the self-assembled QD ensembles. White-light-emitting diodes with low color correlated temperature were fabricated by combining QD-inorganic nanocomposite particles and conventional oxide. In contrast to previous reports describing fabrication of wLED by simple blending of bare quantum dots with silicone encapsulants, QD-embedded in B2O3-SiO2-based nanocomposite particles provide much enhanced stability of light emission during the prolonged operation. (C) 2014 Elsevier B.V. All rights reserved.