Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 12, Issue 3, Pages 1040-1045Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c03538
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Funding
- National Natural Science Foundation of China [22075044, 21574021]
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NLAC is introduced into 2D hybrid perovskites to achieve efficient green emission, leading to the proposal of a new strategy for generating efficient white emission with afterglow. PEPC-3N, as a single-component white-light-emitting material, exhibits dual-color organic afterglow and emission switching characteristics, showing great potential for applications in afterglow WLEDs and information storage.
Herein, an organic fluorophore termed NLAC is introduced into 2D hybrid perovskites with wide band gap (>3.54 eV) to give a green emission with quantum yield up to 81%. The highly efficient luminescence is ascribed to avoiding the aggregation of NLAC and formation of an inorganic free exciton which is easy to thermally quench. On this basis, a new strategy to generate efficient white emission with afterglow has been proposed by codoping a short-wavelength fluorophore and long-wavelength phosphor into 2D organic- inorganic hybrid perovskites (OIHPs). As a result, a single-component white-light-emitting material PEPC-3N based on NLAC with CIE of (0.33, 0.36) and quantum yield up to 43% can be obtained. Interestingly, PEPC-3N shows a dual-color organic afterglow and excitation-wavelength-dependent emission, consequently forming a switch between green fluorescence and yellow afterglow. This unique performance indicates PEPC-3N has huge potential in afterglow WLEDs and information storage.
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