US 10,475,616 B2 · Method for manufacturing nanostructures for a field emission cathode

Abstract

The present invention relates to the field of field emission lighting, and specifically to a method for forming a field emission cathode. The method comprises arranging a growth substrate in a growth solution comprising a Zn-based growth agent, the growth solution having a pre-defined pH-value at room temperature; increasing the pH value of the growth solution to reach a nucleation phase; upon increasing the pH of the solution nucleation starts. The growth phase is then entered by decreasing the pH. The length of the nanorods is determined by the growth time. The process is terminated by increasing the pH to form sharp tips. The invention also relates to a structure for such a field emission cathode and to a lighting arrangement comprising the field emission cathode.

Claims17

Dependent claims

A method for forming a plurality of ZnO nanostructures for a field emission cathode, the method comprising the steps of:

providing a growth substrate;
providing a growth solution comprising a Zn-based growth agent, said growth solution having a pre-defined initial pH-value at room temperature;
arranging said growth substrate in said growth solution;
increasing said pH value of said growth solution to reach a nucleation phase forming nucleation sites on said substrate;
decreasing said pH value to transition from said nucleation phase to a growth phase;
growing said nanostructures for a predetermined growth-time;
and
increasing said pH value to transition from said growth phase to a tip-formation phase.

5 more elements

Dependencies are inferred from the claim text.

Method for manufacturing nanostructures for a field emission cathode

Life of this patent

Method for manufacturing nanostructures for a field emission cathode

Life of this patent

Abstract

Claims17