Study on a new green phosphor Ca12Al14O32Cl2: Tb3+ derived from Tb-doped Ca-Al layered double hydroxide

A new green phosphor Ca12Al14O32Cl2: Tb3+ derived from Tb-doped Ca-Al layered double hydroxide (Tb-doped CaAl-LDH) was prepared through phase transition route. The X-ray diffraction measurement results revealed that the Tb-doped CaAl-LDH transformed into Ca12Al14O32Cl2:Tb3+ phase at 600 °C. With temperature varying from 600, 800-1000 °C, the crystallinity of the Ca12Al14O32Cl2:Tb3+ phase gradually improved. Compositional analyses suggested the chemical formula of the Ca12Al14O32Cl2:Tb3+ phase estimated to be Ca12Al13.52Tb0.48O32Cl2. The Ca12Al13.52Tb0.48O32Cl2 phase can be efficiently excited by near ultraviolet light and show strong green emissions attributed to 5D4→7FJ (J = 5, 6) transition of Tb3+. The present Ca12Al13.52Tb0.48O32Cl2 may be a promising candidate for green phosphor applied in LED.