Fig. 2: Optimising the ink jet printing parameters.
From: Large area inkjet-printed OLED fabrication with solution-processed TADF ink
a Schematic diagram of the cartridge printhead. b Standard unipolar waveform used to drive the piezo-printhead having three major segments rise time, hold time, and fall time; showing the mechanism of droplet formation. c Images captured with increasing pulse width shows that at 9 µs (3,3,3) pulse has the highest drop speed. d Nonlinear plot of drop speed variation with change in pulse width from 3, 6, 9, 12, and 16 µs, respectively. e Drop volume variation with change in pulse width. f Effect of pulse voltage on the drop velocity with applied pulse width of 9 µs (tr = 3, th = 3, and tf = 3). Drop images captured with an inbuilt drop watcher camera with increasing pulse voltage (12 to 29 V) at pulse width of 9 µs (tr = 3, th = 3, and tf = 3). g A linear relationship between the applied pulse voltage with the drop speed.
