Halide ABX3 perovskite particles and their application in controlling photo-flux

Abstract

The present invention provides a light valve containing ABX3 perovskite particles; more specifically is related to a light valve containing halide ABX3 perovskite particles that can control light transmittance. The preferable halide ABX3 perovskite particles in this invention consist of A being at least one of Cs+, CH3NH3+, and Rb+, B being at least one of Pb2+, Ge2+, and Sn2+, and X being at least one of Cl−, Br−, and I−. This kind of halide ABX3 perovskite particles were suspended in a liquid suspension to make a light valve with a light transmittance control, which discloses a completely new application for ABX3 perovskite materials.

1 . A light valve, comprising a first layer of a transparent conductive substrate, an active layer containing ABX 3  perovskite particles, and a second layer of transparent conductive substrate, wherein said ABX 3  perovskite particles have a non-spherical morphology and are in a liquid suspension, and wherein A is at least one of Cs + , CH 3 NH 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 − ; wherein said ABX 3  perovskite particles morphology is nanorods having an average length of about 200 nm-500 nm, and an average diameter of 50 nm-100 nm. 
     
     
         2 . (canceled) 
     
     
         3 . The light valve according to  claim 1 , wherein A is at least one of Cs +  and CH 3 NH 3   + ; B is Pb 2+ ; X is at least one of Br −  and I − . 
     
     
         4 . (canceled) 
     
     
         5 . (canceled) 
     
     
         6 . (canceled) 
     
     
         7 . The light valve  claim 1 , wherein said halide ABX 3  perovskite particles are uniformly dispersed in the liquid suspension. 
     
     
         8 . (canceled) 
     
     
         9 . The light valve according to  claim 7 , wherein said liquid suspension comprises one or more of a mineral resistive oil, a synthetic resistive oil and a vegetable oil. 
     
     
         10 . The light valve according to  claim 7 , wherein said liquid suspension is sandwiched between two transparent electrodes. 
     
     
         11 . A method of controlling light transmittance, comprising using non-spherical ABX 3  perovskite particles suspended in a liquid suspension in a light control device, wherein said ABX 3  perovskite particles are halide ABX 3  perovskite particles, and wherein A is at least one of Cs + , CH 3 NH 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 − ; wherein said ABX 3  perovskite particles morphology is nanorods having an average length of about 200 nm-500 nm, and an average diameter of 50 nm-100 nm. 
     
     
         12 . The method according to  claim 11 , wherein the light control device is a light valve.