Optical properties of flexible fluorescent films prepared by screen printing technology

Abstract

In this work, we prepared a fluorescent film comprised phosphors and silicone on flexible polyethylene terephthalate (PET) substrate using a screen printing technology. The effects of mesh number and weight ratio of phosphors to silicone on the optical properties of the flexible films were investigated. The results indicate that the emission intensity of the film increase as the mesh decreased from 400 to 200, but the film surface gradually becomes uneven. The fluorescent film with high emission intensity and smooth surface can be obtained when the weight ratio of phosphor to gel is 2:1, and mesh number is 300. The luminous efficiency of the fabricated LEDs combined the fluorescent films with 460 nm Ga(In)N chip module can reach 75 lm/W. The investigation indicates that the approach can be applied in the remote fluorescent film conversion and decreases the requirements of the particle size and the dispersion state of fluorescent materials.

Cost-effective screen printing approach for Ce/Nd-doped ZnAl2O4 films: tuning crystallinity induced by the substrate

“…13 Moreover, luminescence films can be deposited on both rigid and flexible substrates, opening up new application fields. 14,15 Usually, screenprinting is implemented to produce films of micrometer thickness; some studies have demonstrated the possibility of deposition of submicron films by tuning the printing pastes. 16 However, the study of an economical way to fabricate NIR luminescent films by screen printing is far from complete.…”