Impact of green-emitting CaSc2O4:Ce3+ phosphor on the illuminance and color uniformity of white-light-emitting diodes

Abstract

<span>blue light stimulation, a novel green phosphor, </span><span lang="EN-GB">Ce<sup>3+</sup></span><span>-activated </span><span lang="EN-GB">CaSc<sub>2</sub>O<sub>4</sub></span><span>, was created, which emits green illumination with a maximum wavelength of 515 nm. Since the brightness performance of </span><span lang="EN-GB">Ce<sup>3+</sup></span><span>-activated CaSc2O4 is equivalent to that of commercial phosphors such as </span><span lang="EN-GB">Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>: Ce<sup>3+</sup></span><span>, it may be utilized as a substance for chroma transformation in white-light-emitting diodes (WLEDs) that comprise one blue LED, one green phosphor, as well as one red phosphor. The Ce ion is most likely at an eight-coordinated Ca position in the base crystal for said phosphor, which posesses orthorhombic CaFe</span><sub><span lang="EN-GB">2</span></sub><span lang="EN-GB">O<sub>4</sub></span><span> configuration. The effect of burning temperature and dopant concentration on luminous strength was examined, and it was discovered that the optimal temperature and concentration reached 1,600 °C and 1 mol % Ce replaced in the Ca site, respectively. By substituting Mg for Ca, the luminous maximum wavelength moved towards greater values. Substituting Ca using Sr, on the other hand, and yielded changes towards lesser wavelengths.</span>