Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.240
Publication date: 22nd December 2022
Metal halide perovskites are hot contenders as next generation of light emitters. Bright and colour-pure light-emitting diodes (LEDs) were demonstrated based on bulk 3D, nanocrystals, and quasi-2D structures (Ruddlesden-Popper phases) with targeted compositions that allow for accessing different spectral regions. Green and red LEDs have reached external quantum efficiencies exceeding 20%, but success in the blue spectral region has so far been limited.
Here we demonstrate blue LEDs with a peak wavelength of 481 nm, a colour purity of up to 88 % (CIE coordinates (0.1092, 0.1738)), an external quantum yield of 5.2 % and a luminance of 8260 cd m-2. These devices are based on quasi-2D PEA2(Cs0.75MA0.25)Pb2Br7, which is cast from solutions containing isopropylammonium (iPAm). The iPAm-modified sample when deposited on a PEDOT:PSS coated substrate, displays an exceptional PLQY as high as 64%. Cross-correlation of the optical and structural investigations indicate that the RP phase is composed of domains of n=3 phases surrounded by higher dimensionality phases, which allow the efficient transport of charge carriers towards the low dimensional domains. Interestingly, the energy transfer of the photoexcitations towards the low dimensional phases is blocked in samples using the iPAm additive, mostly due to the random orientation of very small crystalline domains. These interesting features present in our iPAm-modified system allowed us to fabricate bright blue-emitting PeLEDs with an average wavelength of 483 nm and FWHM of the electroluminescent of 25 nm for our champion device.
Our work demonstrates the great potential to tailor the composition and the structure of thin films based on Ruddlesden-Popper phases to boost performance of optoelectronic devices – specifically for blue-LEDs.
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