Nanodiamond-promoted white light emission in Eu, Dy, and Cu containing phosphate glasses: Quantitative analysis and colorimetric study.

A thorough analysis of glasses 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 character, which along with yellow-emitting Dy 3+ and red-emitting Eu 3+ lead to the white-light emitting glasses. 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 corelated color temperature (CCT) of the emission were ultimately investigated as a two-parametric problem based on: (i) the different ionic components; and (ii) 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.