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

[Display omitted] • A precisely space-separated design strategy of donor-acceptor was proposed. • Intense red emitting borosilicate glass doped with CsPbCl 3 and Mn2+ ion was developed. • The external quantum yield of Mn2+ enhances 9.5 times after codoped with CsPbCl 3. • Only Mn2+ ions that are very close to CsPbCl 3 QDs participate in efficient energy transfer. • Energy coupling mechanism based on space distance/energy transfer rate was proposed. 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 Mn2+ ions. By rationally controlling post heat-treatment, CsPbCl 3 QDs acting as donor were uniformly precipitated in glass and Mn2+ 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 Mn2+ ions in glasses, Mn2+ 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 Mn2+ 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, Mn2+ ion in glass may be very promising for developing high luminescent performance ions-doped transparent glasses. [ABSTRACT FROM AUTHOR]