A preparation method of latent fingerprint developer and its visualization method
A developer and latent fingerprint technology, applied in the fields of latent fingerprint visualization, developer and its preparation, can solve the problems of weak luminous intensity and low quantum yield, and achieve the effects of strong brightness, simple preparation method and low cost of preparation raw materials
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Embodiment 1
[0027] Weigh equimolar mass (1.2 mmol) of the two metal halides, / lead chloride (PbCl2), cesium bromide (CsBr the present embodiment are two metal halides of cesium chloride (CsCI) ) / bromide lead (PbBr 2 ), Cesium iodide (CsI) / lead iodide (PbI2 2 ) Of at least one composition. The above-described metal halide dissolved in 10mL DMF in, 1 mL of oleic acid and oleylamine mixture was then added, the ratio between the volume of oleic acid and oleylamine described in this embodiment is five. Stirred at a temperature at 25 ℃ for 4 hours to obtain a precursor solution. The toluene solution was then slowly added dropwise to the precursor solution, the present embodiment the volume ratio between the embodiment of toluene as a precursor solution dropwise acceleration rate 2mL / min. Centrifugation, washed three times with toluene, and dried to give a white solid. The white solid was dispersed in pure water, ultrasonic, described in the present embodiment as a white powder was placed in ...
Embodiment 2
[0031] Weigh equimolar mass (1.2 mmol) of the two metal halides, two metal halides described in the present embodiment are cesium chloride (CsCl) / lead chloride (PbCl2 2 ), Cesium bromide (CsBr) / lead bromide (PbBr 2 ), Cesium iodide (CsI) / lead iodide (PbI2 2 ) Of at least one composition. The above-described metal halide dissolved in 10mL DMF in, 1 mL of oleic acid and oleylamine mixture was then added, the ratio between the volume of oleic acid and oleylamine to the embodiment of the present embodiment is eight. Stirred at a temperature of 37 ℃ for 10 hours to obtain a precursor solution. The toluene solution was then slowly added dropwise to the precursor solution, the present embodiment the volume ratio between the embodiment and the toluene solution of precursor 6, was dropped, 5mL / min. Centrifugation, washed three times with toluene, and dried to give a white solid. The white solid was dispersed in pure water, ultrasonic, described in the present embodiment as a white ...
Embodiment 3
[0033] Weigh equimolar mass (1.2 mmol) of the two metal halides, two metal halides described in the present embodiment are cesium chloride (CsCl) / lead chloride (PbCl2 2 ), Cesium bromide (CsBr) / lead bromide (PbBr 2 ), Cesium iodide (CsI) / lead iodide (PbI2 2At least one combination is combined. The metal halide was dissolved in 10 ml of DMF, followed by 1 ml of olelamine and oleic acid mixture, and the volume ratio between the oleic acid and the olelamine described in this example was 1. The precursor solution was obtained at a temperature of 50 ° C for 2 hours. Subsequently, the toluene solution was slowly added dropwise to the precursor solution, and the volume ratio between the toluene and the precursor solution described in this example was 2, and the dropping rate was 1 ml / min. Centrifugation, washed three times with toluene solution, dried to give a white solid. The white solid was dispersed in pure water, ultrasound, and the white powder described in this example was...
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