Review on Blue Perovskite Light-Emitting Diodes: Recent Advances and Future Prospects

Abstract

Perovskite-based light-emitting diodes (PLEDs) have emerged as a promising alternative owning to the excellent optoelectronic properties including narrow emission linewidths, high photoluminescence quantum yield (PLQY), tunable emission wavelength, and high color purity. Over the past several years, significant progress has been obtained for green, red, and near-infrared PLEDs with a high external quantum efficiency (EQE) of over 20%. However, the development of blue PLEDs has been limited by several technical issues including poor film quality, inefficient device structure, higher trap density, and so on. To overcome these drawbacks with improved PLQY and EQE, we summarize and analyze the recent advances towards the development of three dimensional (3D), two dimensional (2D) and quasi-2D perovskites film employing composition and/or dimensional engineering. Moreover, the utilization of perovskite nanocrystals (PNCs) is also considered as a feasible strategy for the realization of high-performance blue PLEDs. We systematically evaluate the performance of sky-blue, pure-blue and deep blue PLEDs based on different perovskite materials. Finally, future prospective are proposed to promote the development of efficient blue PLEDs.

Rigid Conjugated Diamine Templates for Stable Dion–Jacobson-Type Two-Dimensional Perovskites

“…In contrast, (PP)­PbI 4 , (FPP)­PbI 4 , and (FPT)­PbI 4 thin films exhibit sharper excitonic features owing to the quantum confinement effects. , The absorption maxima are located at 482, 504, and 496 nm and bandgaps are 2.52, 2.39, and 2.42 eV for (PP)­PbI 4 , (FPP)­PbI 4 , and (FPT)­PbI 4 , respectively. The emission peak positions are 484, 508, and 502 nm for (PP)­PbI 4 , (FPP)­PbI 4 , and (FPT)­PbI 4 , respectively, which is much higher than typical lead iodide-based 2D perovskites that emit around 520 nm. − …”

First-principles study on the elastic, electronic and optical properties of all-inorganic halide perovskite solid solutions of CsPb(Br1−xClx)3 within the virtual crystal approximation

“…S3, ESI †). The photo-absorption coefficients and reectivity were obtained from these dielectric functions using eqn (7) and (8). Fig.…”

“…Recently, all-inorganic halide perovskites have attracted broad interest due to their fascinating optoelectronic properties together with improved material stability, 1,2 and significant advances in stability have already been achieved for mixed organic–inorganic hybrid halide perovskites. 3–5 In fact, this emerging class of materials has shown promising potential in widespread optoelectronic applications such as solar cells, 6,7 light-emitting diodes, 8–10 photodetectors, and lasing devices. 11 Among these, lead-based cesium halide perovskites with chemical formula CsPbX 3 (X = I, Br, Cl) have been studied most widely for advancing perovskite solar cells (PSCs) and perovskite light-emitting diodes (PLEDs).…”

“…PLEDs are expected to be promising for next generation display and lighting. 8 It has been demonstrated that the composition dependent photoluminescence (PL) of CsPbX 3 covers the whole visible spectral range of 410–700 nm with a narrow line width of 12–42 nm and a PL quantum yield close to unity. 22,23 In fact, CsPbI 3 was found to exhibit red luminescence with a wavelength of ∼650 nm, 24 CsPbBr 3 can emit blue and green light, 24–27 and CsPbCl 3 shows a purple light emission.…”

Recent Advances in Blue Perovskite Quantum Dots for Light‐Emitting Diodes

“…Although solution-processed colloidal PQDs have remarkable advantages in cost-effect and high PL QY, the EL PeLEDs applications have been greatly limited due to their low EQE and short operating lifetime. [11,184] Currently, the efforts to strengthen light emission of PeLEDs involve enhancing photon generation, improving light outcoupling and optimizing device structure. [185] Among the factors influencing the device performance, high-quality film is a basic element that enables complete carrier recombination.…”