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

Abstract 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 CsPbCl3 quantum dots and Mn2+ ions. By rationally controlling post heat-treatment, CsPbCl3 QDs acting as donor were uniformly precipitated in glass and Mn2+ ions acting as acceptor are close to CsPbCl3 QDs but not inside CsPbCl3 QDs. Benefitted from high absorption efficiency of CsPbCl3 QDs and efficient energy transfer from CsPbCl3 QDs to Mn2+ ions in glasses, Mn2+ ions give an intense red broadband emission at 650nm, 11 times as intense as the one without CsPbCl3 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 CsPbCl3 QDs. The precise space-separation and energy transfer rate dependent non-radiative energy coupling mechanism was reasonably proposed to explain how CsPbCl3 QDs highly absorb energy, efficiently transfer it and finally feeding Mn2+ ion. These results demonstrate that the strategy of using microcrystalline with high absorption efficiency as donor, for instance, CsPbX3 QDs, to pump optical activator ions as acceptor, for instance, Mn2+ ion in glass may be very promising for developing high luminescent performance ions-doped transparent glasses.