Hydrogen-Bonded\nOrganic Framework Microlasers with\nConformation-Induced Color-Tunable Output

Abstract

Porous\norganic frameworks have emerged as the promising platforms\nto construct tunable microlasers. Most of these microlasers are achieved\nfrom metal–organic frameworks via meticulously accommodating\nthe laser dyes with the sacrifice of the pore space, yet they often\nsuffer from the obstacles of either relatively limited gain concentration\nor sophisticated fabrication techniques. Herein, we reported on the\nfirst hydrogen-bonded organic framework (HOF) microlasers with color-tunable\nperformance based on conformation-dependent stimulated emissions.\nTwo types of HOF microcrystals with the same gain lumnogen as the\nbuilding block were synthesized via a temperature-controlled self-assembly\nmethod. The distinct frameworks offer different conformations of the\ngain building block, which lead to great impacts on their conjugation\ndegrees and excited-state processes, resulting in remarkably distinct\nemission colors (blue and green). Accordingly, blue/green-color lasing\nactions were achieved in these two types of HOFs based on well-faceted\nassembled wire-like cavities. These results offer a deep insight on\nthe exploitation of HOF-based miniaturized lasers with desired nanophotonics\nperformances.