Turn-On Fluorescence Chemical Sensing through Transformation of Self-Trapped Exciton States at Room Temperature.

ABSTRACT: Most of the current fluorescence sensing materials belong to the turn-off type, which make it hard to detect toxic substances such as benzene, toluene, and xylene (BTX) due to the lack of active chemical sites, thereby limiting their development and practical use. Herein, we show a guest-host mechanism stemming from the confined emitter's self-trapped exciton (STE) states or electron-phonon coupling to achieve turn-on fluorescence. We designed a luminescent guest@metal-organic framework (LG@MOF) composite material, termed perylene@MIL-68(In), and established its E-type excimeric emission properties in the solid state. Upon exposure to BTX, especially xylene, we show that the E-excimer readily converts into the Y-excimer due to nanoconfinement of the MOF structure. Such a transformation ele

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC9425555 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature