Journal
LASER & PHOTONICS REVIEWS
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202200861
Keywords
Ion migration; perovskite light-emitting diodes; phase distribution; spectral stability
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A method of controlling the crystallization of reduced-dimensional mixed-halide blue perovskite films by adjusting the precursor concentration is proposed, improving the efficiency and stability of sky-blue and pure-blue perovskite light-emitting diodes (PeLEDs).
Reduced-dimensional perovskite light-emitting diodes (PeLEDs) have shown great potential in solution-processed high-definition displays. However, the inferior electroluminescent (EL) performance of blue PeLEDs has become a huge challenge for their commercialization. The inefficient domain control [number of PbX6- layers (n)] and deleterious phase segregation make the blue PeLEDs suffer from low EL efficiency and poor spectral stability. Here, a rational strategy for perovskite crystallization control by adjusting the precursor concentration is proposed for improving phase distribution and suppressing ion migration in reduced-dimensional mixed-halide blue perovskite films. Based on this method, efficient sky-blue PeLEDs exhibit a maximum external quantum efficiency (EQE) of 8.5% with stable EL spectra at 482 nm. Additionally, spectrally stable pure-blue PeLEDs at 474 and 468 nm are further obtained with maximum EQEs of 4.0% and 2.4%, respectively. These findings may provide an alternative scheme for manipulating perovskite crystallization dynamics toward efficient and stable PeLEDs.
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