Lead-free halide double perovskite (HDP) nanocrystals are considered as one of the most promising alternatives to the lead halide perovskite nanocrystals due to their unique characteristics of nontoxicity, robust intrinsic thermodynamic stability, rich and tunable optoelectronic properties. Although lead-free HDP variants with highly efficient emission are synthesized and characterized, the photoluminescent (PL) properties of colloidal HDP nanocrystals still have enormous challenges for application in light-emitting diode (LED) devices due to their intrinsic and surface defects, indirect band, and disallowable optical transitions. Herein, recent progress on the synthetic strategies, ligands passivation, and metal doping/alloying for boosting efficiency and stability of HDP nanocrystals is comprehensive summarized. It begins by introducing the crystalline structure, electronic structure, and PL mechanism of lead-free HDPs. Next, the limiting factors on PL properties and origins of instability are analyzed, followed by highlighting the effects of synthesis strategies, ligands passivation, and metal doping/alloying on the PL properties and stability of the HDPs. Then, their preliminary applications for LED devices are emphasized. Finally, the challenges and prospects concerning the development of highly efficient and stable HDP nanocrystals-based LED devices in the future are proposed.

https://onlinelibrary.wiley.com/doi/pdf/10.1002/advs.202004118

Lead-Free Halide Double Perovskite Nanocrystals for Light-Emitting Applications: Strategies for Boosting Efficiency and Stability.

Highly Emissive and Stable Cs2AgInCl6 Double Perovskite Nanocrystals by Bi3+ Doping and Potassium Bromide Surface Passivation

Challenges and strategies of all-inorganic lead-free halide perovskite solar cells

A new single-step and green approach for the synthesis of microcrystalline Cs2AgxNa1-xBiyIn1-yCl6 (CANBIC) perovskites in ambient conditions is introduced. The CANBIC powders emit broadband yellow-white self-trapped excitonic photoluminescence (PL) with...

Cs2AgxNa1-xBiyIn1-yCl6 Perovskites Approaching Photoluminescence Quantum Yields of 100 %

Tunable luminescent color from green to blue on long afterglow materials using CsPbBr3 quantum dots

Composition optimization of lead-free double perovskite Cs2AgIn1-xBixCl6 for efficient and stable photoluminescence

The invention discloses a preparation method of a two-dimensional perovskite single crystal with high luminescence purity. A hydrothermal technology is introduced into a solution cooling method to prepare a (BA) 2PbI4 single crystal. As the temperature in the hydrothermal kettle is uniform, the temperature difference between the inside and the outside of the crystal can be eliminated; in the growth process of the (BA) 2PbI4 single crystal, BA organic cations tend to be arranged in order due to the fact that the BA 2PbI4 single crystal bears gas pressure, accumulation of the cations is avoided,and thus the double photoluminescence phenomenon of the two-dimensional (BA) 2PbI4 single crystal is eliminated, and the luminescence purity of the two-dimensional (BA) 2PbI4 single crystal is improved. The (BA) 2PbI4 crystal prepared by adopting a hydrothermal auxiliary solution cooling method is a lamellar lamellar single crystal. The structure of the [PbI6] 4-octahedron is an orthogonal crystal structure. Compared with a (BA) 2PbI4 crystal prepared by a solution cooling method in the prior art, the luminescence purity of the sample prepared by the method is obviously improved.

Preparation method of two-dimensional perovskite single crystal with high luminous purity

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Composition optimization of lead-free double perovskite Cs2AgIn1-xBixCl6 for efficient and stable photoluminescence

Preparation method of two-dimensional perovskite single crystal with high luminous purity