Hybrid halide perovskite based solar cells showed a conversion efficiency of more than 20% in a few years. Perovskite is characterized by unparalleled high absorbance properties and low-cost solution processability. Such materials with the same characteristics are also suitable for light emitting di...
Hybrid halide perovskite based solar cells showed a conversion efficiency of more than 20% in a few years. Perovskite is characterized by unparalleled high absorbance properties and low-cost solution processability. Such materials with the same characteristics are also suitable for light emitting diodes, showing the possibility of success of perovskite LED. perovskite quantum dot have emerged as a promising optoelectronic material for lighting due to its high quantum yield, color-tunable, and narrow emission. However, the problem of toxicity is becoming a big issue. Lead is toxic as well as vulnerable to moisture. Thus, when contacted with a polar solvent, a PbX2 compound is formed. Thereby causing a decrease in the intensity of light emission. Therefore, there are a lot of researches to replace lead. Herein, we report a roomtemperature synthesiszed and replaced the 3D-organolead perovksite Mn2+ with Pb substitution up to 90% When Mn2+ was substituted, orange luminescence was observed by energy transfer from the host to the activator. A high Mn solubility limit of 90% was attained for the first time in lead halide perovskites, facilitated by the flexible organic cation (CH3NH3)+ network, preserving the perovskite structure. The emission intensities of the exciton and Mn were influenced by the halide identity that regulates the energy transfer to Mn. Homogeneous emission and electron spin resonance characteristics of Mn2+ indicate a uniform distribution of Mn. These results suggest that low-toxicity 3D-CH3NH3Pb1−xMnxBr3−(2x+1)Cl2x+1 nanocrystals may be exploited as magnetically doped quantum dots with unique optoelectronic properties.[1] The perovskite quantum dot has a high extinction coefficient in the visible region. Depending on the composition, it absorbs light in the unique ultraviolet, visible and infrared regions and emits a PL that corresponds to the band gap energy of the material itself. PL spectra are important for determining LED characteristics. In the case of perovskite quantum dot, it exhibits a high luminance half-width of about 20 nm with high luminescence color purity, and has a merit of easy adjustment of the balance characteristic which affects the high mobility of charges and recombination of two charges. As a result, it shows high color reproducibility when fabricated with PeLED. When producing CH3NH3PbBr3 as a device, the highest reported EQE was 5.09% and PLQY was 60.5% and CsPbBr3 was reported as PLQE: 90% EQE: 0.15%. However, it has not been reported that PeLED was prepared with a sample substituted with Mn. Therefore, in this experiment, PeLED was fabricated with x = 0 and x = 0.7, which has the highest quantum yield in 3D-CH3NH3Pb1-xMnxBr3-(2x+1) Cl2x+1. The structure of PeLED was coated and deposited ITO / PEDOT: PSS / QDs / BmPyPb / LiF / Al materials. Although quantum yield was lower than that of known perovskite quantum dots, it could be used as an EL device if it was optimized through luminescence.
Hybrid halide perovskite based solar cells showed a conversion efficiency of more than 20% in a few years. Perovskite is characterized by unparalleled high absorbance properties and low-cost solution processability. Such materials with the same characteristics are also suitable for light emitting diodes, showing the possibility of success of perovskite LED. perovskite quantum dot have emerged as a promising optoelectronic material for lighting due to its high quantum yield, color-tunable, and narrow emission. However, the problem of toxicity is becoming a big issue. Lead is toxic as well as vulnerable to moisture. Thus, when contacted with a polar solvent, a PbX2 compound is formed. Thereby causing a decrease in the intensity of light emission. Therefore, there are a lot of researches to replace lead. Herein, we report a roomtemperature synthesiszed and replaced the 3D-organolead perovksite Mn2+ with Pb substitution up to 90% When Mn2+ was substituted, orange luminescence was observed by energy transfer from the host to the activator. A high Mn solubility limit of 90% was attained for the first time in lead halide perovskites, facilitated by the flexible organic cation (CH3NH3)+ network, preserving the perovskite structure. The emission intensities of the exciton and Mn were influenced by the halide identity that regulates the energy transfer to Mn. Homogeneous emission and electron spin resonance characteristics of Mn2+ indicate a uniform distribution of Mn. These results suggest that low-toxicity 3D-CH3NH3Pb1−xMnxBr3−(2x+1)Cl2x+1 nanocrystals may be exploited as magnetically doped quantum dots with unique optoelectronic properties.[1] The perovskite quantum dot has a high extinction coefficient in the visible region. Depending on the composition, it absorbs light in the unique ultraviolet, visible and infrared regions and emits a PL that corresponds to the band gap energy of the material itself. PL spectra are important for determining LED characteristics. In the case of perovskite quantum dot, it exhibits a high luminance half-width of about 20 nm with high luminescence color purity, and has a merit of easy adjustment of the balance characteristic which affects the high mobility of charges and recombination of two charges. As a result, it shows high color reproducibility when fabricated with PeLED. When producing CH3NH3PbBr3 as a device, the highest reported EQE was 5.09% and PLQY was 60.5% and CsPbBr3 was reported as PLQE: 90% EQE: 0.15%. However, it has not been reported that PeLED was prepared with a sample substituted with Mn. Therefore, in this experiment, PeLED was fabricated with x = 0 and x = 0.7, which has the highest quantum yield in 3D-CH3NH3Pb1-xMnxBr3-(2x+1) Cl2x+1. The structure of PeLED was coated and deposited ITO / PEDOT: PSS / QDs / BmPyPb / LiF / Al materials. Although quantum yield was lower than that of known perovskite quantum dots, it could be used as an EL device if it was optimized through luminescence.
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