High pressure photoluminescence and Raman investigations of Rhodamine B absorbed on MIL 53(Fe).

Encapsulating organic dyes within porous solids is an efficient way to design luminescent composite materials and devices. However, for practice applications, the luminescence tuning and the stability investigation of such materials is still a challenge work. Here, a comparative in situ Raman spectra and photoluminescence (PL) spectra are employed to study the structural and optical property of both pure Rhodamine B (RHB) and samples absorbed on a kind of typical materials of institute lavoisier frameworks (MIL) under high pressure, respectively. The luminescence of RHB@MIL 53(Fe) can persist to pressures much higher than that for pure RHB. Our studies revealed that the PL emissions of RHB origin from monomeric and dimeric structures, respectively. Furthermore, our results indicated that the confining effect of MIL 53(Fe) pores inhibited the dimerization of RHB molecules under high pressure. High pressure studies on the host-guest hybrid composed of Rhodamine B molecules absorbed on MIL 53(Fe) displayed a new kind of luminescent composite material with high stability. [Display omitted] • Luminant hybrid was fabricated by encapsulating Rhodamine B molecules on MIL 53(Fe). • The luminescence of hybrid persisted to higher pressures than that for pure samples. • The MIL 53(Fe) protected RHB molecules free from dimerization under high pressure. • The molecular structure and optical property of the hybrid was tuned using pressure. [ABSTRACT FROM AUTHOR]