Pursuit of high-performance blue light emitting perovskite have attracted intensive attention due to insufficient photoluminescence quantum yield (PLQY) of <5% for CsPbCl3, which far lag behind the near-unit PLQYs (>90%)...

In recent years, low-dimensional lead halides have emerged as some of most attractive photoelectric materials due to their intrinsic broadband emissions with a potential application in white-light emitting diodes. To achieve the desired performance, tremendous research has emphasized the modulation of inorganic components as optical centers; however, less work has paid attention to the direct contribution of the organic components. Herein, we successfully assembled two new hybrid lead halides of [H 2 BPP]Pb 2 X 6 (X = Br, 1, and Cl, 2) containing one-dimensional double [Pb 2 X 6 ] 2− chains using optically active 1,3-bis(4-pyridyl)-propane (BPP) as an organic cation. Under UV-light excitation, compounds 1 and 2 exhibit broadband yellowish-green emissions, which were verified by promising photoluminescence quantum efficiencies (PLQEs) of 8.10% and 4.84%, respectively. The broadband light emissions are derived from the combination of dual higher-energy blue and lower-energy yellow light spectra, which can be attributed to the individual contributions of the organic and inorganic components, respectively, according to the time-resolved and temperature-dependent emission spectra as well as theoretical calculations. This work proves the great contribution of organic components to the photophysical properties and provides a new design strategy to realize broadband light emission by rationally combining the dual-emitting properties of different assembly blocks.

Four novel pure hydrocarbon spirofluorene-based compounds were fully investigated for green electrophosphorescent devices.

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