A major target in solid-state lightning research is a single-component, broadband white-light emitter that overcoming the problems of multi-component strategies. However, single-source white-light emitters have very few examples, especially with an intrinsic bulk property for synthetic design. Recently, broadband white-light emission has been realized in (110)-oriented corrugated 2D perovskites with photoluminescence quantum efficiencies (PLQE) of up to 9%, generated from a deformable lattice with self-trapping excitons.1 Meanwhile, the limited stability of organolead halide perovskites towards moisture, heat and air have been discussed extensively, greatly hindering their scale technology for light-emitting applications. In contrast to the vast majority of anionic inorganic extended structures (e.g. zeolites and perovskites), merely less than 100 cationic inorganic materials are present among &gt;150,000 crystal structures in inorganic crystal structure database (ICSD).2&lt;span style="font-size:10.8333px"&gt; &lt;/span&gt;We discover a series of cationic lead halide materials [PbX]+, employing an anionic structure-directing agent.3 All of these cationic 2D and 3D materials exhibit a pronounced broadband white-light emission as an intrinsic property. Among them, the chloride analog has a PLQE up to 11.8 %, comparable to the highest reported value for 2D orgaolead halide perovskites. More importantly, our resulting cationic materials are the long-sought ultrastable lead halide materials, affording the undimished photoemission upon UV-irradation under atmospheric condition (~60 % relative humidity, 1 bar) for 30 days. The initial mechanistic studies indicate that the broadband emission are attributed to the electron-phonon coupling in a highly deformable lattice, which generate radiative, below-bandgap self-trapped excited states.

Intrinsic broadband white-light emission from ultrastable, cationic lead halide materials

255th National Meeting (2018)

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