Full visible spectra of non-doped phosphor for WLED application
Abstract
The Zn 2 SnO 4 – SnO 2 micro-composite has been successfully fabricated by the solid reaction technique followed by calcination at 1100 °C. The obtained powder gives a full visible range from 400 nm to 800 nm. The PL spectra were fitted into five Gaussian peaks in the blue to the far-red region centered about 450 nm, 515 nm, 580 nm, 680 nm, and 740 nm. The origin of these emissions was discussed in detail. The proposed diagram for explaining the PL mechanism has been given in this paper. Further, the prepared phosphors have been coated onto the n-UV LED chip, which shows white light with a high CRI of 95. The result approves that Zn 2 SnO 4 – SnO 2 micro composite is potential applications in white light-emitting diodes by a cheap and straightforward method.