Preparation and photoluminescence characteristics of a new promising red NUV phosphor CaTiO3:Eu3+

A highly Eu3+-doped, highly crystalline CaTiO3 phosphor was prepared via a solid-state (SS) method, and its structure was confirmed by X-ray diffraction (XRD). Photoluminescence (PL) data showed that this phosphor was efficiently excited by near-ultraviolet (NUV) light at wavelength around 400 nm and emitted intense red light with a broad peak around 618 nm corresponding to the 5D0 → 7F2 transition of Eu3+. The relative emission intensity increased with increasing Eu3+ concentration up to 28 mol%, which is extremely high in this field, then decreased due to concentration quenching. The concentration quenching and thermal quenching of the samples are discussed. By optimizing the calcination temperature and Eu3+ concentration, it was shown that CaTiO3:Eu3+ is a promising red phosphor under near ultraviolet excitation for various applications.