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Luminescent Properties of InNbO4: EU Red Phosphors

Last Update Time: 2018-10-11 10:27:08
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Luminescent Properties of InNbO4: EU Red Phosphors

Excitation spectra (left) and emission spectra (right) of InNbO4: EU. The excitation spectrum of the sample shows that the excitation spectrum breaking 350 nm wavelength is divided into two parts: the line less than 350 nm wavelength is broadband, and the line above 350 nm is composed of some sharp peaks. The former is called the charge transfer band 909, while the latter is associated with the Eu3 + 4f- in InNbO4. →The strongest absorption peaks are located in 394nm and 466nm, respectively. These two wavelengths are very similar to the blue and near ultraviolet chips of commercial LED, indicating that InNb04: EU3 + phosphors can be used as luminescent materials on LED. The emission spectrum contains a number of peaks, such as 590 nm, 612 nm, which are EU peaks.Characteristic emission peaks. D of EU is excited by near ultraviolet light at 394 nm. The intensity of forced dipole transition in + F2 (peak at 612 nm) is significantly higher than that in magnetic dipole transition ^ do. →F, intensity (peak value at 577 nm). According to the general rule of electron transition of rare earth EU ~ *, in InNbO _ 4: EU 'crystal, if EU ~ (+) occupies the strictly inverse central lattice of lattice, it can emit D. →7F allows a magnetic dipole transition of 577 nm of orange light. However, the "D" of EU °t in the emission spectrum. The 612mm red light emitted by the forced electric dipole transition occupies the dominant position, which indicates that EU is located in the matrix with no inverse centrosymmetric lattice. At this time, the 4r configuration of Eu' is mixed with the 5d and 5g configuration of the opposite word. Coupled with the effect of field inhomogeneity, the parity rule for InNbO4 crystals has been relaxed. →The forbidden transition is partially lifted, and a dipole emission occurs.