On-chip polychromatic visible light emitters obtained by 3D capillary force assembly

• Three-dimensional particle structures were built from a multi-color (red, green and blue) colloidal suspension using capillary for assembly.
• Optical response was studied under UV irradiation after transfer on a silicon surface.
• Particle structures exhibit a polychromatic visible light emission.
• Spectrum and color can be controlled by varying the red, green and blue particle ratio.
• We report color coordinates very closed to the ideal pure white.

This work presents the fabrication of on-chip polychromatic light source from a colloidal suspension. Capillary force assembly of the colloidal mixture composed from red, blue and green fluorescent dye doped 100 nm particles is performed on a patterned substrate to create particles structure composed of ∼10,000 nanoparticles with a natural hexagonal close-packed arrangement. Under UV excitation, the particle structure exhibit a white light emission closed to the CIE characteristics of the ideal pure white.

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