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The most important single principle in the use of color is that whenever detailed information is to be shown, luminance contrast is necessary.
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Figure 3 shows luminance versus voltage characteristics, and the inset of Figure 3 shows current density versus voltage characteristics of devices A, B, C, and D. The dotted circle on the graph of Figure 3 shows reduction in the turn-on voltage from 3.5 V of the reference device (device A) to 2.5 V of the MQW structure device (device D).
We have fabricated efficient blue organic light-emitting devices (OLEDs) with 4,4′-bis 9-ethyl-3carbazovinylene -1,1′-biphenyl BCzVBi 9-ethyl-3carbazovinylene -1,1′-biphenyl BCzVBi 9-ethyl-3carbazovinylene -1,1′-biphenyl BCzVBi 9-ethyl-3carbazovinylene -1,1′-biphenyl BCzVBi 9-ethyl-3carbazovinylene -1,1′-biphenyl BCzVBi asd luminous efficiency are greathe enhanced in the doped devices.
In [18], it shows that luminance masks have little effect on color contrast detection while chromatic masks greatly affect the detectability of luminance contrast.
These results showed that luminance impacts the cognitive pupillary reaction – tonic pupil diameter (phasic pupil response) being modulated under sustained (respectively, transient) cognitive load.
Compared with corresponding PF homopolymers, the EL devices based on PF-PTPA block copolymers showed higher luminance and current efficiency than those of PF homopolymers because of the improvement of hole injection by the introduction of PTPA segment.
The device with III as the electroluminescent layer shows a luminance of 800 Cd/m2 at 10 V with conversion efficiency of 0.5 Lm/W, whereas the device with IV as the electroluminescent layer demonstrates somewhat lower characteristics, viz., 200 Cd/m2 at 13 V.
Blue dotted lines show actual luminance observations in all three plots.
Figure 5 shows that luminance efficiency versus current density curves of a DB3 ZnO device before and after annealing.
DB3 ZnO device shows maximum luminance efficiencies (1.78 cd/A) and with annealing (2.45 cd/A) having a brightness 643 and 776 cd/m2at a current density of 36.16 and 31.67 mA/cm2, respectively.
The maximum brightness of the DB4 ZnO reaches 9,490 cd/m2 (7.51 V), which is much higher than that of DBPPV (5,004 cd/m2 at 7.41 V). Figure 2a shows the luminance efficiency versus current density characteristics for the devices.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com