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Fluorescein–silica nanoparticles as hybrid dyes were prepared by a reverse microemulsion method. The nanoparticles exhibited suitable optical properties to be combined with a 450 nm LED to achieve white-light emitting diodes. Their optical and thermal stability were investigated. Upon excitation at 450 nm the composite film comprised of fluorescein–silica nanoparticles and silicone led to white light with CCT around 6600 K and a maximum luminous efficacy of 26 lm W−1.

Graphical abstract: Silica encapsulated fluorescein as a hybrid dye for blue-LED based lighting devices

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