Broad-band emission and color tuning of Eu3+-doped LiCa2SrMgV3O12 phosphors for warm white light-emitting diodes

Abstract In this study, series of Eu 3+ -doped LiCa 2 SrMgV 3 O 12 (LCSMV) phosphors with broad-band emission and color tunable feature were prepared via solid phase reaction. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results presented a pure cubic phase product with micron-sized and homogeneous distribution of element. Their spectroscopic properties were investigated systematically by photoluminescence excitation (PLE) and emission (PL) spectra, temperature-dependent PL spectra and luminescence decay curves. The LCSMV phosphors displayed a strong absorption to ultraviolet light and a broad cyan emission. Moreover, in Eu 3+ -doped LCSMV phosphors, Eu 3+ ion characteristic emissions at 589, 610, 651 and 705 nm, attributing to the 5 D 0 → 7 F 1 , 7 F 2 , 7 F 3 and 7 F 4 transitions, were observed. Along with Eu 3+ ion concentrations increasing, the emission colors could be readily tuned from cyan to orange and the decay lifetimes of (VO 4 ) 3- became shorter. Meanwhile, electric dipole-dipole interaction was responsible to energy migration from (VO 4 ) 3- groups to Eu 3+ ions. Further, the quantum efficiency (QE) values were estimated to be 32.5% for LCSMV host and 39.3% for LCSMV: 0.01Eu 3+ sample. Finally, a LED lamp was prepared by integrating the blend of the LCSMV: 0.01Eu 3+ phosphors and commercial blue-emitting BaMgAl 10 O 17 :Eu 2+ phosphors with NUV chip (365 nm) and exhibited warm white light (CCT = 3655 K, Ra = 90), which may be applied in lighting and display field.