Energy transfer and photo/cathodoluminescence performances investigation of a luminescent material Ce-+(3) /Tb3+ co-doped Na2Ca2Si2O7 for multifunctional applications

摘要

Exploring novel efficient luminescence materials for applications in solid-state lighting and display is highly meaningful and important thing. Herein, we report a new Ce3+/Tb3+ co-doped Na2Ca2Si2O7 (NCSO) phosphor with high energy transfer and efficient luminescence performances. The co-doped samples own broad excitation spectra covering the whole near-UV region, and the emission spectra can be adjusted from blue to green by increasing Tb(3+ )concentration. The decrease of lifetime and the ratio of Ce3+ and Tb3+ emission intensity indicate the samples have high energy transfer efficiency, which can reach 90%. The mechanism of energy transfer between Ce3+ and Tb3+ was demonstrated in detail and it is attributed to dipole-dipole interaction. According to the temperature-dependent PL spectra of NCSO: 0.03Ce(3+),0.12 Tb3+, the Tb3+ emission intensity still remained about 71% of initial intensity at 225 degrees C. Meanwhile, the Ce3+/Tb3+ emission intensity ratio of NCSO: 0.03Ce(3+),0.12 Tb3+ exhibits a linear correlation from 298 K to 498 K with a high sensitivity of 0.59% K-1. The fabricated white LED emits dazzling white light with low CCT 4353K and high CRI 80.2, and the luminous efficiency is 37.61 MI/W. The CL spectra under different accelerating voltage with various probe current reveal that the phosphor possesses high saturation voltage and saturation current. Under high-energy electrons bombing, the phosphor displays excellent ageing resistance. The outstanding performances of the phosphors on PL and CL provide the possibility for application in LED and FEDs. (C) 2020 Elsevier B.V. All rights reserved.