OVJP injection block
A deposition device including an injection block and a print die is provided, which allows for vertical movement of the injection block while still maintaining connection between the print die and external gas sources. Also disclosed is an injection block suitable for such devices, which provides improved vertical range of motion and thermal consistency compared to conventional injection block devices.
1 . An organic vapor jet printing (OVJP) device comprising:
a print die; and
an injection block comprising:
an internal recess entirely within the injection block;
an internal gas distribution manifold to distribute carrier gas and/or vacuum to the print die; and
a flexible bellows disposed within the internal recess within the injection block and in fluid communication with the internal gas distribution manifold, which allows the injection block to move at least 150 μm vertically relative to a fixed-position gas distribution system while maintaining a fluid connect between the print die and the injection block.
2 . The OVJP device of claim 1 , wherein the injection block comprises a monolithic block of material and the internal gas distribution manifold comprises one or more channels machined into the monolithic block of material.
3 . The OVJP device of claim 1 , wherein the flexible bellows allows the injection block to move at least 300 μm vertically while maintaining the fluid connection between the print die and the injection block.
4 . The OVJP device of claim 1 , further comprising an inner seal in fluid communication with a first end of the flexible bellows and with the internal gas distribution manifold.
5 . The OVJP device of claim 4 , wherein the internal recess is disposed adjacent to an outer surface of the injection block, and further comprising an outer seal to seal the internal recess from the outer ambient environment and retain heat within the internal recess.
6 . The OVJP device of claim 1 , further comprising an input tube in fluid communication with the bellows and with a source of carrier gas and/or organic vapor material.
7 . The OVJP device of claim 6 , wherein the input tube has an inner diameter of at least 0.635 cm.
8 . The OVJP device of claim 7 , wherein the input tube has an inner diameter of at least 0.7 cm.
9 . The OVJP device of claim 1 , further comprising a heating element configured to maintain a temperature within the injection block with a variation of 2 C or less.
10 . The OVJP device of claim 1 , wherein the print die comprises channels etched in a monolithic block, the channels being in fluid communication with the internal gas distribution manifold of the injection block.