A precisely space-separated strategy of donor-acceptor for intense red emitting composite borosilicate glass co-doped with CsPbCl3 quantum dots and Mn2+ ions

Optical ions doped transparent glasses have attracted more and more attention because of their potential application in photonic applications. Unfortunately, optically active dopants occupy at non-crystalline coordination environment, which leads to their poor luminescence efficiency. Therefore, how to enhance luminescence efficiency of optically active dopants in glasses remains a great challenge. Here, we proposed a precisely space-separated strategy of donor-acceptor and successfully developed an intense red emitting composite borosilicate glass co-doped with CsPbCl 3 quantum dots and Mn 2+ ions. By rationally controlling post heat-treatment, CsPbCl 3 QDs acting as donor were uniformly precipitated in glass and Mn 2+ ions acting as acceptor are close to CsPbCl 3 QDs but not inside CsPbCl 3 QDs. Benefitted from high absorption efficiency of CsPbCl 3 QDs and efficient energy transfer from CsPbCl 3 QDs to Mn 2+ ions in glasses, Mn 2+ ions give an intense red broadband emission at 650 nm, 11 times as intense as the one without CsPbCl 3 QDs. The optimal external quantum yield of the as-synthesized composite borosilicate glass is estimated to be 28.5%, 9.5 times as large as 3% for the one without CsPbCl 3 QDs. The precise space-separation and energy transfer rate dependent non-radiative energy coupling mechanism was reasonably proposed to explain how CsPbCl 3 QDs highly absorb energy, efficiently transfer it and finally feeding Mn 2+ ion. These results demonstrate that the strategy of using microcrystalline with high absorption efficiency as donor, for instance, CsPbX 3 QDs, to pump optical activator ions as acceptor, for instance, Mn 2+ ion in glass may be very promising for developing high luminescent performance ions-doped transparent glasses.