Abstract
For solving the problem that Eu3+-activated phosphors cannot be well excited by the near UV-LED chips, the charge transfer band (CTB) of Eu3+-N3– in α-M3B2N4 (M = Ca, Sr) has been investigated in this work. Compared with the sharp excitation peaks due to the f–f transitions of Eu3+, the charge transfer band is broad and the excitation band of α-M3B2N4 (M = Ca, Sr):Eu3+ centered at 370 or 350 nm lies in near-UV, implying a promising excitation. The electron and crystal structures of α-M3B2N4 (M = Ca, Sr) has been analyzed in detailed, indicating that they all crystallize in cubic phase with the space group (Im3m) and have similar band-gap structures. The double bond of [N = B═N]3– combining with the face-shared (Ca, Sr)N6 octahedron forms the stable and compact crystal structure, and the band gap with the value about 4 eV is suitable for Eu3+ to form a luminescent center. Under near-UV excitation, the sharp red light that peaked at 613 and 593 nm resulting from the f–f transition of Eu3+ ions has been obt...
Published Version
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