Laser induced white emission generated by infrared excitation from Eu³⁺:Sr₂CeO₄ nanocrystals

The laser induced white emission (LIWE) was observed from Eu³⁺:Sr₂CeO₄ nanocrystals. The samples were obtained in form of powders by the modified sol-gel route. The structure and morphology of the phosphors were investigated by powder X-ray diffraction and transmission electron microscope techniques. The intense LIWE occurred under reduced pressure and focused beam of near infrared laser excitation. The power and pressure dependencies exhibit evident threshold character typical for the avalanche effect. The photoconductivity of the Eu³⁺:Sr₂CeO₄ nanocrystals measured as a function of different powers of excitation source was analyzed.