Preparation Of Highly Stable Nano-Y-TiOPc And Its Application Performance

Nano Y-type titanyl phthalocyanine(Y-TiOPc)has been proven promissing applications in photoelectric conversion materials and devices owing to its possessing strong light absorption in the range of 600-900 nm.An unstable Y-crystal type is easily converted into a stable?-crystal type with poor photoelectric response,which deteriorates the performance of the materials and devices.Consequently,the preparation method of Y-TiOPc nanomaterial with excellent stability and the excellent performance device have been considered as important issues in this filed.In this paper,trifluoroacetic acid is used as a solvent,because it is low toxicity and recyclable.We systematically surveyed the factors in the process of purification and crystal form adjustment such as temperature,shear rate,acid solution drop acceleration and dispersion medium volume effect on the size,crystal form,thermodynamic properties and photoconductivity of TiOPc.The optimal conditions for the preparation of high stability Y-TiOPc nanomaterial is that:Acid soluble temperature:0?,drop acceleration:5.0 m L/min,dispersion:50%(V/V)C2H5OH/H2O,precipitation temperature:-20?,stirring rate:900 r/min;Crystal adjustment solvent:1,2-C2H4Cl2/H2O microemulsion(volume ratio is 2:1),stirring rate:900 r/min,crystal adjustment temperature:30?.As a result,the average crystal size of Y-TiOPc is 2.86 nm and the crystallinity is 93.82%.In addition,the crystal exhibits a stable crystalline type in the methyl ethyl ketone/cyclohexanone system under ultrasonic or ball milling dispersion for 4 h,and the transmittance change of the dispersion was only 0.53%for 30 days.It shows that the Y-TiOPc particle prepared by this method have stronger?-?interaction and tighter packing and the crystal form to be more stable.The XRD and thermodynamic performance studies show that the established preparation method allows Y-TiOPc to preferentially grow the(222)crystal plane and can generate intermolecular hydrogen bonds with H2O,which is another reason why the crystal is stable.The organic light-guiding device which is prepared using Y-TiOPc as a carrier generating material and N,N,N',N'-tetra(4-methylphenyl)-1,1'-biphenyl-4,4'-diamine as a hole transport material,shows the V0 of-878.89 V,Rd of-12.10 V/s,Vr of-14.65V,and E_1/2 of 0.17?J/cm² with excitation of 780 nm laser.This work provides an effective method for achieving Y-TiOPc nanomaterials with excellent performance.