A novel single-phase color tunable LiYGeO4:Dy3+, Eu3+ phosphor exhibiting warm white light and excellent thermal stability

(a) Diffuse reflectance spectrum and (b) LYGO, LYGO:0.015Dy 3+ , LYGO:0.02Eu 3+ , LYGO:0.015Dy 3+ , 0.02Eu 3+ band gap values; (c) the LYGO phosphors band structure; (d) Dy 3+ , Eu 3+ doped phosphors of the LYGO band structure.