Electroluminescent materials

Bhushan, S.

doi:10.1016/0735-245x(85)90027-4

Cited by 2 publications

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References 47 publications

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“…Cu can also help in forming conducting layer for making possible the excitation of the materials with field [26]. Role of NaF in photoconducting CdS powders prepared by firing at 500°C for 1 hr was found to be two fold [27,28]: (i) it acted as a flux because lanthanide impurities could not become effective dopant in its absence and (ii) it acted as dopant since at its particular concentration the highest photo response was found in this system.…”

Section: S Nomentioning

confidence: 98%

Electroluminescence studies of chemically deposited (Zn-Cd)S:Cu,F films

Khare

Bhushan

2006

Cryst. Res. Technol.

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Electroluminescence (EL) emission has been observed under AC field excitation in chemically deposited (dipping technique) films of (Zn-Cd)S:Cu,F using substrates of conducting glass plates. Results of XRD, SEM, absorption spectra, transmission spectra, EL emission spectra, voltage, frequency and temperature dependence and brightness waves of EL brightness are presented and discussed. SEM studies show better growth condition in presence of F. X-ray diffraction studies show diffraction lines due to CdS and ZnS. Both the studies represent average particle sizes of the order of 1Å. Absorption studies show change in band gap due to increasing concentration of ZnS. The observed EL emission (blue-green region) may be due to Cu, F combination. Results of transmission spectra give band gap similar to those given by absorption spectra. From voltage dependence of EL brightness acceleration-collision mechanism is found to be effective. Frequency dependence of EL brightness shows first an increase in brightness in the lower frequency range followed by saturation at higher frequencies. Temperature dependence of EL emission shows a maximum at 40°C. Brightness waves consist of primary and secondary waves, which depend on voltage and frequency of excitation & the ambient temperature.

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Section: S Nomentioning

confidence: 98%

Electroluminescence studies of chemically deposited (Zn-Cd)S:Cu,F films

Khare

Bhushan

2006

Cryst. Res. Technol.

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Effect of KI/LiF/CdCl₂on photoluminescent and electroluminescent properties of nanocrystalline (Zn-Cd)S: Cu films

Khare

Bhushan

2006

Radiation Effects and Defects in Solids

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The effect of KI/LiF/CdCl 2 on photoluminescent and electroluminescent (EL) spectra have been reported for (Zn-Cd)S:Cu films. Nanocrystalline films of (Zn-Cd)S:Cu have been prepared using chemical deposition technique in aqueous alkaline bath and their subsequent condensation on substrates. Important results in terms of XRD, SEM, absorption spectra, PL and EL spectra, voltage and frequency dependence of EL brightness are presented. Also, EL brightness waves, EL decay and dependence of EL brightness on nature of electrode material are presented and discussed. SEM studies show best growth conditions in the presence of CdCl 2 . Results of XRD studies are associated to ZnS and CdS. Both the studies show average particle sizes to be in the nano order. PL and EL emissions from different films show emission peaks in the blue-green region. Results of absorption spectra show a slight change in band gaps owing to the addition of impurities. Voltage dependence of EL brightness shows effectiveness of acceleration-collision mechanism. Frequency dependence of EL brightness first shows an increase in brightness in the lower frequency range, followed by saturation at higher frequencies. Brightness waves consist of primary and secondary waves, which depend on voltage and frequency of excitation. EL cells with Al electrode give better brightness compared with cells with Ag electrodes. The lifetimes of EL emission are found to be of the order of microseconds.

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Electroluminescent materials

Cited by 2 publications

References 47 publications

Electroluminescence studies of chemically deposited (Zn-Cd)S:Cu,F films

Electroluminescence studies of chemically deposited (Zn-Cd)S:Cu,F films

Effect of KI/LiF/CdCl₂on photoluminescent and electroluminescent properties of nanocrystalline (Zn-Cd)S: Cu films

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Electroluminescent materials

Cited by 2 publications

References 47 publications

Electroluminescence studies of chemically deposited (Zn-Cd)S:Cu,F films

Electroluminescence studies of chemically deposited (Zn-Cd)S:Cu,F films

Effect of KI/LiF/CdCl2on photoluminescent and electroluminescent properties of nanocrystalline (Zn-Cd)S: Cu films

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Effect of KI/LiF/CdCl₂on photoluminescent and electroluminescent properties of nanocrystalline (Zn-Cd)S: Cu films