Harnessing the potential of thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) is crucial for developing light‐emitting diodes (LEDs), lasers, sensors, and many others. However, effective strategies in this domain are still relatively scarce. This study presents a new approach to achieving highly efficient deep‐blue TADF (with a PLQY of 25%) and low‐energy orange RTP (with a PLQY of 90%) through the fabrication of lead‐free hybrid halides. This new class of monomeric and dimeric 0D antimony halides can be facilely synthesized using a bottom‐up solution process, requiring only a few seconds to minutes, which offer exceptional stability and nontoxicity. By leveraging the highly adaptable molecular arrangement and crystal packing modes, the hybrid antimony halides demonstrate the ability to self‐assemble into regular 1D microrod and 2D microplate morphologies. This self‐assembly is facilitated by multiple non‐covalent interactions between the inorganic cores and organic shells. Notably, these microstructures exhibit outstanding polarized luminescence and function as low‐dimensional optical waveguides with remarkably low optical‐loss coefficients. Therefore, this work not only presents a pioneering demonstration of deep‐blue TADF in hybrid antimony halides, but also introduces 1D and 2D micro/nanostructures that hold promising potential for applications in white LEDs and low‐dimensional photonic systems.
Molecular persistent luminescence, such as room-temperature
phosphorescence
(RTP) and thermally activated delayed fluorescence (TADF), have attracted
broad attention in the fields of biological imaging, information security,
and optoelectronic devices. However, the development of molecular
micro/nanostructures combining both RTP and TADF properties is still
in an early stage. Herein, a new type of organic metal hybrid perovskitoid
(OMHP) two-dimensional (2D) microcrystal has been fabricated through
a facile solution method. The long-lived TADF–RTP dual emission
can be highly tuned by changing the excitation wavelength, temperature,
and decayed time. Moreover, the 2D OMHP microsheet exhibits an asymmetric
and anisotropic optical waveguide with low optical loss coefficient,
together with extremely high linearly polarized fluorescence–phosphorescence
emission (anisotropy = 0.96), which is promising for the development
of polarization-sensitive luminescent materials. Therefore, this work
not only demonstrates new OMHP showing colorful persistent luminescence
under different modes (such as excitation wavelength, temperature,
polarization, lifetime, and dimension) but also takes advantage of
the 2D micro/nanostructure to provide potential applications as optical
logic gates and for delicate multiple information encryption.
Harnessing the potential of thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) is crucial for developing light‐emitting diodes (LEDs), lasers, sensors, and many others. However, effective strategies in this domain are still relatively scarce. This study presents a new approach to achieving highly efficient deep‐blue TADF (with a PLQY of 25%) and low‐energy orange RTP (with a PLQY of 90%) through the fabrication of lead‐free hybrid halides. This new class of monomeric and dimeric 0D antimony halides can be facilely synthesized using a bottom‐up solution process, requiring only a few seconds to minutes, which offer exceptional stability and nontoxicity. By leveraging the highly adaptable molecular arrangement and crystal packing modes, the hybrid antimony halides demonstrate the ability to self‐assemble into regular 1D microrod and 2D microplate morphologies. This self‐assembly is facilitated by multiple non‐covalent interactions between the inorganic cores and organic shells. Notably, these microstructures exhibit outstanding polarized luminescence and function as low‐dimensional optical waveguides with remarkably low optical‐loss coefficients. Therefore, this work not only presents a pioneering demonstration of deep‐blue TADF in hybrid antimony halides, but also introduces 1D and 2D micro/nanostructures that hold promising potential for applications in white LEDs and low‐dimensional photonic systems.
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