Abstract
In this study, triphenylamine-based hole-transporting material 4-(9,9-diphenylacridin-10(9H)-yl)-N-(4-(9,9-diphenylacridin-10(9H)-yl) phenyl)-N-phenylaniline (TPA-1A) was designed and synthesized by using single-step Buchwald–Hartwig coupling reaction with higher yield percentage of 76%. Our synthesized TPA-1A showed excellent thermal stability, with a higher glass transition temperature of 176 °C and decomposition temperature of 474 °C at 5% weight reduction. TPA-1A based green phosphorescent organic light emitting diodes (PhOLED) device was fabricated to investigate the device properties and compare it with the similar reference N,N′-Di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB)based device. The TPA-1A-based PhOLED demonstrated an excellent current and power efficiency of 49.13 cd/A and 27.56 lm/W, respectively. Moreover, TPA-1A demonstrated better hole injection efficiencies as well. The overall efficiencies were better than the reference NPB-based device.
Highlights
Organic light emitting diodes (OLEDs) have given dramatic development in display technology and printed flexible electronics because of their efficiency enhancement while showing advantages of lower power consumption, high brightness, and contrast
A 150 nm thickness substrate was subjected to ultra-sonication with isopropyl alcohol organic layer-embedded OLED devices
The thermal stabilities of TPA-1A were investigated by Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) measurements; these data
Summary
Organic light emitting diodes (OLEDs) have given dramatic development in display technology and printed flexible electronics because of their efficiency enhancement while showing advantages of lower power consumption, high brightness, and contrast. One of the largest obstacles in the development of highly efficient and stable phosphorescent organic light emitting diode (PhOLED) is the design and synthesis of effective hole-transporting materials, which should possess higher hole mobility with lower injection barrier and stable morphological properties. There are many advantages associated with TPA moieties, which are electron-donating, low ionization potential, high hole mobility, and have a stable morphology and thermal properties. Free rotating phenyl groups at the 9th position can enhance the rigidity, thermal stability, and prevent pi-pi stacking over molecules This observation will give a better result as a hole-transporting material when compared to carbazole-based molecules [30–37]. We have designed and synthesized a hole-transporting material with a triphenylamine core and diphenyl acridine moieties, which was anticipated to show higher quantum efficiencies with stable thermal properties
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