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Batal, Mohamed Anwar
- Spectroscopic Study of FTO/CdSe (MPA)/ZnO Artificial Atoms Emitting White Color
Authors
1 Department of Physics, Aleppo University, SY
Source
Indian Journal of NanoScience, Vol 5, No 1 (2017), Pagination: 1-4Abstract
Objective: To design Light Emitting Diode (LED) based on artificial atoms using spin coating method and to study its optical spectroscopy to determine emission wavelength and emitted color of this LED.
Methods: By using UV-spectrometer, absorption spectra were measured. Photo luminescence spectra were carried out using spectrophotometer (Hitachi-FL250) at room temperature. To determine electronic transition responsible of PL peaks, we analyzed PL spectra using Gaussian profile broading line method using Mathcad program.
Finding: The range of absorption wavelength was found (350-550 nm). PL spectra contain four peaks (350-400-500-550 nm) that mean this LED emits white color depending on theory of maxing color. Intensity of blue and yellow peak colors was higher than red and green peak colors. Gaussian analysis reveals that all theoretical electronic transitions and this structure of quantum confinement semiconductor emit white color. By varying the thickness of layers, the order of wavelengths can be changed to emit a single color of visible spectrum. This project can reduce energy consumption in the world by the produce of LED based on Quantum dots.
Improvement: We can enhance performance of this LED by adding active layer of artificial atoms that emit green and red color to make intensity of white color.
Keywords
CdSe, Artificial Atoms, LED, PL Spectra, White Color.Full Text
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- Electrical Properties of Light Emitting Diode Preparation From FTO/CdSe (MPA)/ZnO Artificial Atoms Emitting White Color
Authors
1 Department of Physics, Aleppo University, SY
Source
Indian Journal of NanoScience, Vol 5, No 1 (2017), Pagination: 1-6Abstract
Objective: To design Light Emitting Diode (LED) based on artificial atoms quantum confinement effect using spin coating method and to study its electrical properties to determine emission wavelength and emit color of this LED.
Methods: This LED was prepared using spin coating and all layers were prepared by chemical method. By using Keitithley (28775) Current-voltage characteristic was carried out at room temperature in direct and reverse bias,C-Vcharacteristic measurements was carried out using RLC meter (6379) at 100 Hz Frequency. Tunneling conductance spectra was measured also using RLC meter.AC measurement (impedance spectra) was carried out using Gain Phase Analyzer (Schlumberger-SI1253). A complex impedance Spectrum was in a frequency range (1-20000HZ) and at constant voltage (V=5V).
Finding: FTO micro Slide with low resistance (10-13Ω) using hot spray, CdSe (MPA) was prepared using chemical method and ZnO was prepared using sol-gel method. I-V characteristic was used to determine ideal factor (which was 18) and reverse current (0.44 mA). C-V spectra shows multi high barrier in this structure due to quantum confinement effect. Electronic transition in tunneling conductance spectra are indicated with electronic transition in absorption and PL spectra. Impedance spectra confirm the quantum size effect in layers of LEDs and interpret white color emission.
Improvement: We can enhance performance of this LED by adding active layer of artificial atoms acting as hole transporting layer to increase emitting green and red color, which enhances the intensity of white color clearly.
Keywords
CdSe, Artificial Atoms, Led, Electrical Properties, Tunneling Conductance Spectra.Full Text
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