Nanodiamond‐promoted white light emission in Eu, Dy, and Cu‐containing phosphate glass: quantitative analysis and colorimetric study

Abstract

A thorough analysis of glass containing Eu 2 O 3 and Dy 2 O 3 , or Eu 2 O 3 , Dy 2 O 3 , and CuO melted together with nanodiamond powder was pursued based on measurements of optical absorption, photoluminescence (PL) emission and excitation spectra, and colorimetry. Nanodiamond facilitated the stabilization of Cu + and Eu 2+ ions with blue-emitting characteristics that, along with yellow-emitting Dy 3+ and red-emitting Eu 3+ led to the white light-emitting glass. Novel intensity notations implemented in intensity-based spectral ratios, and difference intensity correlation analysis were proposed for the assessment of PL properties. The chromaticity and correlated colour temperature of the emission were ultimately investigated as a two-parametric problem based on: (1) the different ionic components; and (2) the various excitation wavelengths employed. The optical analysis approach adds to the characterization methods to further fundamental understanding and provide helpful analytical tools for designing materials for tunable white light-emitting devices.