Our work provides a new host lattice K5Y(P2O7)2 for both Eu3+ and Tb3+ luminescence, with non-concentration quenching, a high IQE and good thermal stability.
Developing broad-band-emitting phosphors is very important to light-emitting diode (LED) lighting and displays. We introduced Eu 2+ to solid solutions K 2 YZr 1−y Hf y (PO 4 ) 3 with a langbeinite-type structure to prepare a series of new phosphors. In this structure, two K + sites could be occupied by Eu 2+ cations to provide two different kinds of coordination environments, leading to broad emitting bands in the range of 390−700 nm. The coordination circumstance of Eu 2+ was analyzed by Gaussian fitting and time-resolved emission spectra. Furthermore, the emitting intensity and thermal stability can be improved by modulating the crystalline field via substituting Zr 4+ by Hf 4+ . When the Zr 4+ was fully substituted by Hf 4+ , the external quantum efficiency increased by 53.75%, giving a bright cyan emission. Finally, an archetype white-LED lamp was made using cyan phosphor K 2 YHf(PO 4 ) 3 :0.04Eu, red phosphor CaAlSiN 3 :Eu 2+ , and a 365 nm LED chip, which realized an applicable color rendering index (R a = 81) and a correlated color temperature (CCT = 3792 K).
This work reports a new host template, K3BiTaP3O13, for both Eu3+ and Tb3+ luminescence, providing a ‘dimensional obstacle’ to suppress negative concentration quenching with a high density of Eu3+ or Tb3+.
For Mn-activated phosphors, the luminescent performance is strongly dependent on the oxidation state of Mn. In this paper, a series of red phosphors NaMg(PO3)3:xMn2+ (NMP:xMn2+) were synthesized by high temperature...
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