• DHRUBAJYOTI SAIKIA

      Articles written in Bulletin of Materials Science

    • Fabrication of organic light-emitting diode using molybdenum trioxide interlayer between electrode and organic interface

      DHRUBAJYOTI SAIKIA RANJIT SARMA

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      In this study, high-performance of organic light-emitting diodes (OLEDs) with a buffer layer of MoO$_3$ is demonstrated. With an optimal thickness of MoO$_3$ (12 nm), the luminance efficiency is found to be increased compared to the single layer anode OLED. To study the influence of MoO3 buffer layer on OLED performance, we deposited MoO$_3$ films with different thicknesses on the fluorine-doped tin oxide (FTO) surface and studied J–V and L–V characteristics of the OLED devices. Also, further analysis was carried out by measuring sheet resistance, optical transmittance and surface morphology with the FESEM images. Here, we found that MoO3 (12 nm) buffer layer is a good choice to increase the efficiency of FTO-based OLED devices within the tunnelling region. Here, the maximum value of current efficiency is6.15 cd A$^{−1}$.

    • Characterization of organic light-emitting diode using a rubrene interlayer between electrode and hole transport layer

      DHRUBAJYOTI SAIKIA RANJIT SARMA

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      In this paper, we report the characteristic properties of an organic light-emitting diode (OLED) using a rubrene buffer layer over the fluorine-doped tin oxide (FTO) surface. Our study includes both electrical and optical properties of the device. Here, we study the OLED devices at different thicknesses of the buffer layer, which varies from 3 to 11 nm. For device fabrication, we use a thermal evaporation unit. Finally, we report that device performance in a bilayer anode form is always higher than that of a single-FTO-based device. Maximum device efficiency is found to be 6.31 cd A$^{−1}$ around 8-nm thickness of rubrene layer over the FTO surface.We also study the stability of both the single-layer and double-layer anode OLED devices. Through this study, we found that both device efficiency and luminance intensity of the bilayer anode OLED remain more stable for more number of days compared with the single-FTO OLED device.

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