Starting materials: Cs2CO3, PbI2, ZnI2, oleic acid (OA), 1-octadecene (ODE), oleylamine (OAm), bis(2,4,4-trimethylpentyl) phosphinic acid (TMPPA), methyl acetate, hexane
Product: CsPbI3 quantum dots
Description: A hot-injection approach was used to synthesize cesium lead iodide quantum dots. Cs2CO3 (0.25g, 99.9%), OA (0.98 mL, 90%), and ODE (9 mL, 90%) were mixed in a 25 mL three-neck flask and vacuum dried at 120 degrees Celsius for one hour through the use of a Schlenk line. Cs2CO3 was dissolved by heating the solution to 150 degrees C for 10 minutes, and this initial solution was then kept at 100 degrees C to prevent precipitation. PbI2 (120 mg, 99.99%) and ZnI2 (250 mg, 99.99%) were dissolved in a blend of ODE (5 mL), OAm (2 mL), and TMPPA (2 mL) at 120 degrees C for one hour. This solution was then set to a reaction temperature dependent upon the desired QD size (between 145 and 190°C). The initial solution (0.4 mL) was injected into the second solution, and after 20 seconds the flask was quenched in an ice bath. To separate QDs from unreacted salts, the product was centrifuged for 30 minutes at 1,290 g. QDs were collected and, after methyl acetate was used to isolate the QDs, they were suspended in hexane.
Method: Absorption
Description: The absorption spectrum was recorded from a dispersion of the QDs in hexane.
Starting materials: Cs2CO3, PbI2, ZnI2, oleic acid (OA), 1-octadecene (ODE), oleylamine (OAm), bis(2,4,4-trimethylpentyl) phosphinic acid (TMPPA), methyl acetate, hexane
Product: CsPbI3 quantum dots
Description: A hot-injection approach was used to synthesize cesium lead iodide quantum dots. Cs2CO3 (0.25g, 99.9%), OA (0.98 mL, 90%), and ODE (9 mL, 90%) were mixed in a 25 mL three-neck flask and vacuum dried at 120 degrees Celsius for one hour through the use of a Schlenk line. Cs2CO3 was dissolved by heating the solution to 150 degrees C for 10 minutes, and this initial solution was then kept at 100 degrees C to prevent precipitation. PbI2 (120 mg, 99.99%) and ZnI2 (250 mg, 99.99%) were dissolved in a blend of ODE (5 mL), OAm (2 mL), and TMPPA (2 mL) at 120 degrees C for one hour. This solution was then set to a reaction temperature dependent upon the desired QD size (between 145 and 190°C). The initial solution (0.4 mL) was injected into the second solution, and after 20 seconds the flask was quenched in an ice bath. To separate QDs from unreacted salts, the product was centrifuged for 30 minutes at 1,290 g. QDs were collected and, after methyl acetate was used to isolate the QDs, they were suspended in hexane.
Method: Photoluminescence
Description: The photoluminescence spectrum was recorded from a dispersion of the QDs in hexane.