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A series of n‐Si/diamond/CeF3/ITO composite film electroluminescence (EL) devices are made, and it is found that their EL spectra and EL intensities vary with the thickness of the CeF3 layer. For EL devices with a CeF3 layer thickness less than 500 nm, the EL spectrum is mainly concentrated in the blue and red areas. When the thickness of CeF3 exceeds 500 nm, the EL spectra of devices are primarily...
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