Abstract
Poor stability has long been one of the key issues that hinder the practical applications of lead-based halide perovskites. In this paper, the photoluminescence (PL) quantum yield (QY) of bromide-based perovskites can be increased from 2.5% to 71.54% by introducing water, and the PL QY of a sample in aqueous solution decreases minimally over 1 year. The enhanced stability and PL QY can be attributed to the water-induced methylamino lead bromide perovskite (MAPbBr3)@PbBr(OH). We note that this strategy is universal to MAPbBr3, formamidine lead bromide perovskite (FAPbBr3), inorganic lead bromide perovskite (CsPbBr3), etc. Light-emitting devices (LEDs) are fabricated by using the as-prepared perovskite as phosphors on a 365 nm UV chip. The luminance intensity of the LED is 9549 cd/m2 when the driven current is 200 mA, and blemishes on the surface of glass are clearly observed under the illumination of the LEDs. This work provides a new strategy for highly stable and efficient perovskites.
Highlights
In recent years, lead halide perovskites (LHPs) APbX3(A = CH3NH3+/CH(NH2)2+/Cs+, X = Cl−/Br−/I−) have emerged as promising materials for photovoltaics and light-emitting diodes due to their attractive optical and electrical properties, such as high photoluminescence (PL) quantum yield (QY), narrow emission spectrum, tuneable emission wavelength, high absorption coefficient, and long carrier diffusion length[1,2,3,4,5,6,7,8,9,10,11]
We show that the PL QY and stability of LHPs can be greatly enhanced by adding water, and the PL QY of the LHPs can be increased from 2.50% to 71.54%, while that of a sample in aqueous solution decreases minimally after 1 year
Detailed characterizations indicate that MA-d changes to rod-shaped PbBr(OH), and MAPbBr3 quantum dots (QDs) are embedded in situ into the PbBr(OH) microrods to form MAPbBr3@PbBr(OH)
Summary
(A = CH3NH3+/CH(NH2)2+/Cs+, X = Cl−/Br−/I−) have emerged as promising materials for photovoltaics and light-emitting diodes due to their attractive optical and electrical properties, such as high photoluminescence (PL) quantum yield (QY), narrow emission spectrum, tuneable emission wavelength, high absorption coefficient, and long carrier diffusion length[1,2,3,4,5,6,7,8,9,10,11]. Profound developments have been witnessed in the fields of solar cells[12,13,14,15], solidstate light-emitting diodes[11,16,17,18,19,20], photodetectors[21,22,23], and lasers[7,24,25]. The poor stability of LHPs, especially in water and polar solvents, remains a crucial issue that hampers their applications.
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