1 research outputs found
Enhance Color Rendering Index via Full Spectrum Employing the Important Key of Cyan Phosphor
A new concept called “full-spectrum
lighting” has
attracted considerable attention in recent years. Traditional devices
are usually combined with ultraviolet–light-emitting diode
(LED), red, green, and blue phosphors. However, a cyan cavity exists
in the 480–520 nm region. Hence, cyan phosphors are needed
to compensate for the cavity. (Sr,Ba)<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>Cl:Eu<sup>2+</sup> phosphors feature an extremely unique and
tunable photoluminescence spectrum. Nevertheless, the tuning mechanisms
of these phosphors remain unclear. In this study, we elucidate the
mechanism of the cation size-controlled activator uneven-occupation
and reoxidation in (Sr,Ba)<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>Cl:Eu<sup>2+</sup> phosphors. This mechanism could help tune the
optical properties of related apatite families and structures with
multiple cation sites and strongly uneven occupation of activators
and cations. Finally, the package of the LED device is constructed
to show that both color rendering index Ra and R9 are higher than
95. Thus, the device could be a potential candidate for full-spectrum
lighting