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

• A significant quenching of QDs was relieved by addition of a boron alkoxide.
• Fornation of QD nanocompsite improved stability of LEDs even after prolonged operation.
• QD-oxide nanocomposite particles were synthesized to passivate the surface of QDs from oxidation and corrosion.

We have synthesized quantum dot (QD)-embedded inorganic nanocomposites by effective combination of spray pyrolysis and subsequent sol–gel processing. The rapid depression of emission intensity of QDs just after addition of ammonia for sol–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.