Abstract
The research and development of red and far-red light emitting phosphors for full-spectrum white LEDs is a hotspot in the field of solid state lighting. Herein, a novel garnet-type Li6CaLa2Nb2O12: Mn4+, Bi3+ (LCLN: Mn4+, Bi3+) far-red phosphor was designed and prepared via solid-state method at 900 °C. XRD, SEM and EDS were used to analyze the phase purity, morphology and element composition of LCLN: xMn4+/yBi3+. The luminescence properties including PL and PLE spectra recorded at 298 K–473 K were discussed in detail. Due to spectral overlap between PL spectra of Bi3+ and the PLE spectra of Mn4+, Bi3+ was used as a sensitizer to further optimize the luminescence performance. The optimal sample LCLN: 0.004Mn4+, 0.01Bi3+ was selected to prepare a full-spectrum white LED with lower CCT (4553 K), relatively high Ra (96.4) and CIE color coordinates (0.336, 0.356).
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