Enhance Color Rendering Index via Full Spectrum Employing the Important Key of Cyan Phosphor

Abstract

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)(PO)Cl:Eu 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)(PO)Cl:Eu 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.

White light emitting thermally stable bismuth phosphate phosphor Ca3Bi(PO4)3:Dy3+ for solid‐state lighting applications

“…In the present era, phosphor‐converted white light emitting diodes (pc‐WLEDs) are materializing as a dynamic solid‐state light source for the next generation lighting and display devices. The pc‐WLEDs offer numerous advantages such as higher efficiency, less energy consumption, long operating lifetime (>100 000 hours), robustness, and environmental friendly characteristics as compared to incandescent and fluorescent lamps . There are several ways to obtain white light.…”

“…The pc-WLEDs offer numerous advantages such as higher efficiency, less energy consumption, long operating lifetime (>100 000 hours), robustness, and environmental friendly characteristics as compared to incandescent and fluorescent lamps. [1][2][3][4][5] There are several ways to obtain white light. Presently, the commercial approach comprises of blue emitting InGaN chip with yellow emitting (YAG: Ce 3+ ) phosphor.…”

An orange‐emitting phosphor BaSrGa4O8:Bi3+,K+ with unique one‐dimensional chain structure for high index color WLEDs

“…2,3 As a result, intense research efforts focused on the full-spectrum emission under near-ultraviolet (NUV) excitation. 4,5,6 However, efficient long-wavelength emitting phosphors are still lacking. Recently, Li et al reported a new method that oxygen vacancy can induce energy level splitting of Bi 3+ ion to achieve long-wavelength emission.…”

Synthesis, electronic structures, and photoluminescence properties of an efficient and thermally stable red-emitting phosphor Ca3ZrSi2O9:Eu3+,Bi3+ for deep UV-LEDs

“…6,7 Therefore, ultraviolet (UV) LEDs combined with phosphors are an important and promising alternative for the fabrication of full spectrum lighting sources that are healthy and comfortable to human beings. 8,9 With their rapid development, UV LEDs are mainly divided into near-UV LEDs (300-400 nm) and deep UV LEDs (200-300 nm). 10 Correspondingly, new highly efficient and thermally stable phosphors should be rapidly developed so as to match the emission wavelength of UV LED chips.…”