Recent Advances on Cyan‐Emitting (480 ≤ λ ≤ 520 nm) Metal Halide Perovskite Materials

Abstract

Over the past several years, perovskite‐based luminescent materials and devices have attracted considerable research interest and achieved superior performance, including red/near‐infrared, green, and blue regions. Despite the abundant research progress in the above‐mentioned luminous regions, studies on cyan‐emitting perovskites are still lacking. However, cyan‐emitting perovskite materials are of great importance and have many promising applications, especially for high‐quality lighting and light communication. Herein, the recent research progress on perovskite with cyan emission is summarized, including the preparation methods and improvement on device performance. The preparation strategies are categorized into compositional engineering, dimensional engineering, and size engineering. The corresponding device performance is displayed too. Furthermore, the strategies of performance enhancement and future perspectives are proposed in the end. There is hope that this minireview can trigger more attention to this particular emitting region.

Dendritic CsSnI3 for Efficient and Flexible Near‐Infrared Perovskite Light‐Emitting Diodes

“…[5] External quantum efficiencies (EQEs) of the leadbased perovskite light-emitting diodes (Pero-LEDs) have all exceeded 20% for the green, [6][7][8] red, [9] and red/near-infrared (NIR) [10][11][12][13] emitting ones, which shows great potential in lighting and colorful display. [14][15][16][17][18] However, the lead toxicity issue has become an enormous obstacle lying on the way to commercialization. [19] To overcome this problem, scientists have developed diverse lead-free MHPs, including equal divalent metal cations (such as Sn 2+ ), [20][21][22] double perovskites using two metal cations (mono valent and trivalent cations, such as Ag + and Bi 3+ ), [23] and some perovskite variants using single monovalent (such as Cu + ) [24] or trivalent (such as Sb 3+ ) [25] metal cations.…”

Dual‐Phase Regulation for High‐Efficiency Perovskite Light‐Emitting Diodes

“…[1,2] Additionally, for light-emitting applications, the best MHPs exhibit high photoluminescence quantum yields (PLQYs), narrow emission linewidths, and tunable emission. [3][4][5] In recent years, continued improvements in Pero-LEDs have enabled external quantum efficiencies (EQEs) to exceed 20%. [6][7][8][9][10][11] escape from the CsPbBr 3 emitter (effective recombination region), and the collision between delocalization excitons could cause severe non-radiative recombination.…”

Interfacial “Anchoring Effect” Enables Efficient Large‐Area Sky‐Blue Perovskite Light‐Emitting Diodes

“…[ 6 , 7 , 8 ] However, as one of the primary‐color devices, the performance of blue PeLEDs still lags far behind from the other counterparts in terms of device efficiency and operational stability. [ 9 , 10 , 11 ] Meanwhile, all the reported device areas of state‐of‐the‐art blue PeLEDs remain small (at several mm 2 ) due to uneven morphologies and vast defects in the solution‐processed mixed halide (e.g., Br and Cl) perovskite films, [ 12 , 13 ] and large‐area blue PeLEDs have not yet been reported to date.…”