tailieunhanh - Luminescence properties of Mn4+-doped CaAl2 O4 as a red emitting phosphor for white LEDs

The excitation spectrum exhibited broadband emission between 260 and 550 nm with three peaks dominating at 320 nm due to the transition of 4 A2 4 T1 . The emission spectra between 600 to 720 nm displays an overwhelming emission peak at 654 nm owing to the 2 E4 A2 transition of Mn4+ ion. |

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