Engineering of perovskite light-emitting diodes based on quasi-2D perovskites formed by diamine cations

Large Organic Cations in Quasi-2D Perovskites for High-Performance Light-Emitting Diodes

“…Large-size diamines, which can form 2D perovskites with a formula of L­(SMX 3 ) n −1 MX 4 , may drive quasi-2D perovskite with different structures. , In diamine-based quasi-2D perovskite there is no van der Waal gap between the organic cations, which sets up better defensive wall to prevent the invasion of moisture or heat, thus increasing the rigidity and stability of perovskite . Similarly, EDBE 2+ -based ( EDBE 2+ = 2,2-(ethylenedioxy)­bis­(ethylammonium)) quasi-2D perovskite showed decreased grain size and enhanced morphology . Recently, Yuan et al introduced 1,4-Bis­(ammoniummethyl)­benzene ( P-PDA 2+ ) into quasi-2D perovskite, which exhibits stronger interaction with inorganic octahedron compared with traditional large cation monoamine (such as PEA + ).…”

“…70 Similarly, EDBE 2+ -based (EDBE 2+ = 2,2-(ethylenedioxy)bis(ethylammonium)) quasi-2D perovskite showed decreased grain size and enhanced morphology. 68 Recently, Yuan et al introduced 1,4-Bis(ammoniummethyl)benzene (P-PDA 2+ ) into quasi-2D perovskite, which exhibits stronger interaction with inorganic octahedron compared with traditional large cation monoamine (such as PEA + ). It is confirmed that PbBr 6 4− octahedron planes were separated by the monolayer of P-PDA 2+ cations, indicating the symmetrical double-side hydrogen bonding between P-PDA 2+ and PbBr 6 4− .…”

Improved highly efficient Dion–Jacobson type perovskite light-emitting diodes by effective surface polarization architecture

“…13–17 Although a wide emission spectral region from blue to NIR has been reported, investigations into DJ-type PeLEDs are still rare compared to RP-type ones. 12,18–23…”

Design of 2D Templating Molecules for Mixed-Dimensional Perovskite Light-Emitting Diodes

“…By combining both 3D and 2D perovskites to form mixed-dimensional RP phases, benefits of charge transport and enhanced radiative recombination can both be achieved, leading to higher photoluminescence (PL) quantum yield (PLQY) and device performance in these mixed systems. ,− In addition to surface defect passivation, the coexistence of multiphases in the film triggers an energy funnelling phenomenon as a result of the different band gaps of the different RP phases. − Here, the higher band gap domains from the lower dimensional phases act as donors while the lowest band gap domain from the 3D phase acts as acceptors. The energy transfer from the donor to the acceptor states leads to a high concentration of carriers in the acceptor domains.…”