ABX3 perovskite particles and their application in reverse mode controlling photo-flux

Abstract

The present invention provides a reverse mode light valve containing ABX 3 perovskite particles; more specifically is related to a light valve containing halide ABX 3 perovskite particles that can control light transmittance. This light control valve has the property of higher light transmittance when the power is turned off (OFF state) and lower light transmittance when the power is turned on (ON state). In the halide ABX 3 perovskite particles, A is at least one of Cs + , CH3NH3 + , and Rb + , B is at least one of Pb 2+ , Ge 2+ , and Sn 2+ , and X is at least one of Cl − , Br − , and I − . This halide ABX 3 perovskite particles were suspended in a liquid suspension to make a light valve with a light transmittance control. This light valve performs well and opens up a completely new field of application for ABX 3 perovskite materials.

What is claimed is: 
     
         1 . A reverse mode light valve, comprising of a first layer of a transparent conductive substrate; an active layer containing an ABX 3  perovskite particles are suspended in a liquid suspension; and a second layer of transparent conductive substrate. 
     
     
         2 . The reverse mode light valve as recited in  claim 1 , wherein the said the reverse mode means the light control valve has the property of higher light transmittance when the power is turned off (OFF state) and lower light transmittance when the power is turned on (ON state). 
     
     
         3 . The reverse mode light valve as recited in  claim 1 , wherein the said ABX 3  perovskite particles are halide ABX 3  perovskite particles, and wherein A is at least one of Cs + , CH3NH 3 +, and Rb + , B is at least one of Pb 2+ , Ge 2+ , and Sn 2+ , and X is at least one of Cl − , Br − , and I − . 
     
     
         4 . The halide ABX 3  perovskite particles as recited in  claim 3 , wherein the said ABX 3  perovskite particles, and wherein A is at least one of Cs +  and CH3NH 3   + , B is Pb 2+ , X is at least one of Br −  and I − . 
     
     
         5 . The ABX 3  perovskite particles as recited in  claim 1 , wherein the said ABX 3  perovskite particles have a non-spherical morphology. 
     
     
         6 . The ABX 3  perovskite particles as recited in  claim 5 , wherein the said ABX 3  perovskite particles morphology is at least one of the nanorod (one-dimensional); a nanosheet (two-dimensional); a cuboid, irregular (three-dimensional) particles. 
     
     
         7 . The ABX 3  perovskite particles as recited in  claim 6 , wherein the said ABX 3  perovskite particles morphology is nanosheets have a length of about 50 nm-2000 nm, and a thickness of 5 nm-100 nm. 
     
     
         8 . The reverse mode light valve as recited in  claim 1 , wherein the said light valve means that said halide perovskite particles are uniformly dispersed in a liquid suspension. 
     
     
         9 . A liquid suspension as recited in  claim 8 , wherein the said liquid suspension can maintain the suspended ABX 3  perovskite particles in gravitational equilibrium. 
     
     
         10 . A liquid suspension as recited in  claim 8 , wherein the said liquid suspension comprises one or more a mineral resistive material, a synthetic resistive material, a vegetable oil. 
     
     
         11 . A liquid suspension as recited in  claim 8 , wherein the said liquid suspension is sandwiched between two transparent electrodes.