High-Performance Quasi-Two-Dimensional CsPbBr2.1Cl0.9:PEABr Perovskite Sky-Blue LEDs with an Interface Modification Layer

Abstract

This paper elucidates the increased luminescence efficiency of CsPbBr2.1Cl0.9 sky-blue perovskite light-emitting diodes (PeLEDs) achieved through the interface modification of 3,4 ethylenedioxythiophene (PEDOT):polystyrene sulfonic acid (PSS)/quasi-two-dimensional (QTD) perovskite using CsCl and CsBr materials, respectively. QTD films were fabricated using ratios of CsPbBr2.1Cl0.9 doped with phenethylamine hydrobromide (PEABr) at 60%, 80%, and 100%. The solvent dimethyl sulfide (C2H6OS) was employed under the excitation of ambient and 365-nm laser lights. The PeLED structure was composed of Al/LiF/2,2',2"-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi)/CsPbBr2.1Cl0.9:PEABr/interface modification layer/PEDOT:PSS/ITO glass. The optimized results revealed that the luminance, current efficiency, and external quantum efficiency of the QTD CsPbBr2.1Cl0.9:80% PEABr PeLED with the CsCl interface modification additive was 892 cd/m2, 3.87 cd/A, and 5.56%, respectively.

Phenethylammonium bromide interlayer for high-performance red quantum-dot light emitting diodes

“…15–20 Among these strategies, interfacial modification is one of the most cost-effective methods and widely employed in optoelectronic devices, such as organic light-emitting diodes (OLEDs), organic solar cells (OSCs), perovskite light emitting diodes (PeLEDs), and perovskite solar cells (PSCs). 9,21–24 For example, Tang et al modified the interface between the perovskite EML and the ZnMgO ETL with the amino-based compound, which not only interacted with ZnMgO and thereby modified the growth of perovskite film, but also passivated the perovskite defects. 25 Tulus et al fabricated the ZnO-based PSCs with the interlayer C 60 , which passivated the interfacial trap states and reduced non-radiative recombination losses, resulting in the increased efficiency and stability.…”

Suppressing Growth Strategy on Synthesizing Stable and High-Quality Blue-Emitting CsPbBr3 Quantum Dots

“…Therefore, the CsPbBr 3 nanostructures are extensively applied in solar cells, light-emitting diodes (LEDs), photodetectors, and other photovoltaic fields. , Among them, the efficiency improvement of blue perovskite LEDs (PeLEDs) based on CsPbBr 3 is still inferior to that of their green and red counterparts . The current approaches to achieve deep-blue emission are doping and the Br/Cl mixed anion replacement , strategy. However, the devices usually have low device efficiency, short lifetime, and instability due to phase separation and ion migration. − In addition, ultra-small CsPbBr 3 quantum dots (QDs) with strong confinement can also achieve blue PeLEDs. , …”

“…12,13 Among them, the efficiency improvement of blue perovskite LEDs (PeLEDs) based on CsPbBr 3 is still inferior to that of their green and red counterparts. 14 The current approaches to achieve deep-blue emission are doping 15 and the Br/Cl mixed anion replacement 16,17 strategy. However, the devices usually have low device efficiency, short lifetime, and instability due to phase separation and ion migration.…”