Colour Stable Efficient Quasi-2D Blue Perovskite Light-Emitting Diodes

Green and red emissive perovskite LEDs (PeLEDs) external quantum efficiencies (EQEs) have reached over 22%.

However, the blue PeLEDs lags far behind due to the poor color stability ie, during device operation, emission color shifts from blue to green spectral region. This project will mainly tackle the key challenge of color stability to obtained efficient blue PeLEDs. It has three objectives. Firstly, new quasi-2D perovskites (Q2DPs) will be designed with unique combination of cations.

Secondly, metal doping will be used to improve optoelectronic properties of the new Q2DP based films without deteriorating their color stability.

Finally, we aim to fabricate state-of-the-art efficient blue PeLED by using suitable charge transport layers (CTLs) and related device physics.

First and second objective will almost start at the same time because final color stability needs to be checked with the device.

Once we get stable blue emission then we will start metal doping in Q2DP films to improve optoelectronic properties which will enhance overall device performance.

Absorbance spectrometer, Hall effect, steady state PL, TRPL, PLQY, TA, FTIR, ToF-SIMS, KPFM, AFM, SEM, and XRD techniques will be used to investigate optoelectronic and structural properties of new quasi-2D perovskites. successful impact of this project will not only promote the state-of-the-art color stable efficient blue PeLED but also advance the research field for low-cost lighting and display applications.