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 B 2 O 3 –SiO 2 -based nanocomposite particles provide much enhanced stability of light emission during the prolonged operation.