Abstract
Light-emitting glass shows potential to be used in high-power light-emitting diode (LED) devices because of its homogeneous emission, excellent thermal stability, and simple and low-cost fabrication procedures. The reported quantum efficiencies (QEs) of Ce3+-based luminescent glasses do not compete with those of phosphors because of their loose structures. In this study, a series of high-efficiency luminescent strontium borate (SBO) glasses SBO:Ce3+, Tb3+ are designed and developed. Our work skillfully takes advantage of the Tb3+ ion acquiring the transferred energy from nonluminescent Ce4+ and luminescent center Ce3+ ions, almost doubling their luminescence QE and achieving an astonishing QE of 100%. Also, their chrominance could be conveniently adjusted from blue to green through the white light region by increasing the amount of Tb3+. The optimal SBO:20% Ce3+, 15% Tb3+ glass also presents excellent thermal luminescence stability compared to commercial DS-200 phosphor. An assembled SBO-LED shows a bright greenish-white emission at 4 W of power.
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