A high-efficiency blue-LED-excitable broadband Cr 3+ /Ni 2+ co-doped garnet phosphor toward next-generation spectroscopy applications

Cr 3+ /Ni 2+ introduces a strong crystal field Ca 3 Al 2 Ge 3 O 12 host to obtain a coordinated energy level position. Heavily doped Cr 3+ selectively transfers energy to Ni 2+ , significantly enhancing the absorption efficiency of blue light.