Ni2+-doped CsPbI3 perovskite nanocrystals with near-unity photoluminescence quantum yield and superior structure stability for red light-emitting devices

Mn2+‐Doped CsPbI3 Nanocrystals for Perovskite Light‐Emitting Diodes with High Luminance and Improved Device Stability

“…Finally, the pristine CsPbI 3 and Mn 2þ (6.7 mol%): CsPbI 3 PeNCs were adopted as the EMLs to construct PeLEDs. Similar to the case previously reported, [16][17][18]25,26] both devices have the same multilayer structured architecture (Figure 5a), where ITO glass, PEDOT: PSS, poly-TPD, PeNCs layer, TPBi, and LiF/Al were used as the anode, hole-injection layer (HIL), hole-transporting layer (HTL), EML, electron-transporting layer (ETL), and cathode, respectively. Apart from TPBi, LiF, and Al fabricated by thermal evaporation, all the other layers were processed via a spin-coating method.…”

“…[14,15,19,[30][31][32][33][34] The luminance and operating stability (T 50 value) of the present Mn 2þ : CsPbI 3 PeLED after inserting a LiF buffer layer are comparable with those of the CsPbI 3 -based PeLEDs with the inverted device structure previously reported (Table 2). [16][17][18]25,26,[35][36][37][38][39] Particularly, the device stability (T 50 lifetime) at a high operating luminance (225 min) is better than most of the reported CsPbI 3 PeLEDs. We believe that the device parameters can be further improved via overall optimization of the morphologies and structures of various functional layers in the device, especially the perovskite EML.…”

“…As an alternative, B-site ion doping was used to solve this bottleneck problem. [13][14][15][16][17][18][19] Currently, dopants, such as Zr 4þ , Zn 2þ , Sr 2þ Cu 2þ , Ni 2þ , and Ag þ , have been successfully incorporated into CsPbI 3 host to modify both PLQYs and stability. [14][15][16][17][18][19] Notably, bivalent manganese (Mn 2þ ) ions, showing identical valance and similar radius with Pb 2þ , have been introduced into CsPb(Cl/Br) 3 host by substituting Pb 2þ to reduce the usage of Pb 2þ heavy metal ions and produce extra Mn 2þ red luminescence originating from dÀd transition.…”

“…[13][14][15][16][17][18][19] Currently, dopants, such as Zr 4þ , Zn 2þ , Sr 2þ Cu 2þ , Ni 2þ , and Ag þ , have been successfully incorporated into CsPbI 3 host to modify both PLQYs and stability. [14][15][16][17][18][19] Notably, bivalent manganese (Mn 2þ ) ions, showing identical valance and similar radius with Pb 2þ , have been introduced into CsPb(Cl/Br) 3 host by substituting Pb 2þ to reduce the usage of Pb 2þ heavy metal ions and produce extra Mn 2þ red luminescence originating from dÀd transition. [20] Recently, Mn 2þ -doped CsPbI 3 PeNCs were demonstrated to exhibit significantly improved phase stability related to the undoped CsPbI 3 ones, [21] and the power conversion efficiency of perovskite solar cell using the optimized Mn 2þ -doped CsPbI 3 film can reach as high as 16.5%.…”

Stable and Efficient Red Perovskite Light-Emitting Diodes Based on Ca 2+ -Doped CsPbI 3 Nanocrystals

“…In addition, B-site doping can not only enhance the stability of CsPbI 3 NCs but also boost their optoelectronic performance. Several B-site doping ions have been studied to promote the development of CsPbI 3 NC LEDs, such as Mn 2+ [33], Zn 2+ [34,35], Zr 2+ [36], Y 3+ [35], Cu 2+ [37], Ni 2+ [38], and Sr 2+ [39][40][41]. It should be emphasized that some doping ions, such as Zn 2+ , Cu 2+ , and Sr 2+ , can reduce charge injection barriers and enhance carrier transport properties.…”