Tailoring\nof Spectral Behaviors in Ce<sup>3+</sup>-Activated Ba<sub>2</sub>Gd<sub>8</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub> Cyan-Emitting Phosphors\nvia Site Substitutio

Highly efficient Ce<sup>3+</sup>-activated Ba<sub>2</sub>Gd<sub>8</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub> (BGSO) cyan-emitting\nphosphors were designed to simultaneously fulfill the applications\nof plant growth and a white-light-emitting diode (white-LED). Here,\nthe spectral behaviors of the studied samples are manipulated by arranging\nCe<sup>3+</sup> to occupy various crystallographic sites (<i>i.e</i>., Ba<sup>2+</sup> and Gd<sup>3+</sup>) in BGSO host\nlattices. Upon ultraviolet light excitation, all the samples emit\nan intense asymmetric broadband emission from Ce<sup>3+</sup> and\nits fluorescence intensity is strongly impacted by the dopant concentration\nand occupied position. In addition, the resultant phosphors do not\nonly possess satisfied thermal stability but also present high internal\nand extra quantum efficiencies of 78.6 and 61.8%, respectively, which\ncan be regulated by selecting the substituted sites. Two cyan-emitting\nLEDs are fabricated by integrating the synthesized phosphors, and\ntheir emission bands align well with the absorption peaks of plant\npigments, enabling their uses in plant growth. Furthermore, the controlled\nplant growth environments also clarify that the packaged cyan-emitting\nLED can effectively promote plant growth. Additionally, via adopting\nthe resulting phosphors as cyan-emitting converters, full-spectrum\nwhite-LED with good electroluminescence behaviors is developed. These\nfindings manifest that the Ce<sup>3+</sup>-activated BGSO phosphors\nwith tunable spectral properties are promising cyan-emitting components\nfor both artificial plant growth LED and full-spectrum white-LED.