Synthesis and characterization of Eu(III)-incorporated silica nanoparticles for application to UV-LED

• A tetrakis(dibenzylmethanto) Eu(III) complex was synthesized.
• Eu(III)-incorporated silica nanoparticles as core–shell, outer-shell and intermediate-shell architectures were synthesized.
• Phosphor-converted LEDs were fabricated by casting the powder complex and the silica nanoparticles onto a 365-nm InGaN chip.
• Thermal stabilty and photophysical properties of the fabricated LEDs were investigated.

A tetrakis(dibenzylmethanido) Eu(III) complex as a ultraviolet (UV) excited phosphor was synthesized, and incorporated with mesoporous silica as core–shell (CS), outer-shell (OS) and intermediate-shell (IS) architectures, using a combination of the self-organization process and the Stöber method. Exciting the Eu(III) complex at UV light produced a strong sensitized red-emission from Eu(III) by energy transfer from the ligand. Phosphor-converted light-emitting diodes (pc-LEDs) were fabricated by casting the powdered complex and the incorporated silica nanoparticles onto a 365-nm InGaN chip, and their optical properties and thermal stability were investigated in terms of the chromaticity index and the intensity decay, respectively. The CS silica nanoparticle casted UV-LED exhibited the best perfomence with strong intensity and excellent thermal stability.

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