Luminescence Properties of Eu~(2+)/Mn~(2+) Codoped Borophosphate Glasses

摘要

On the basis of the glass network structure and spectroscopy information, the full-color-emitting borophosphate glasses doped/codoped with Eu~(2+) and Mn ions were synthesized, and their photoluinincscence (PL) properties were evaluated. The interaction of Mn~(2+)-Mn~(2+) pairs shifts its emission to longer wavelength without a notable negative effect on the intensity in Mn~(2+) -doped glasses. Depending on the small amount of B_2O_3 added, the Mir ions suffer different surrounding environments giving three emission bands at 526,597, and 638 nm, respectively. In codoped samples, the weak red emission resulting from the forbidden transition of Mn~(2+) could be enhanced by the energy transfer from Eu~(2+) because of the spectral overlap between the PL excitation spectrum of Mn~(2+) and the PL spectrum of Eu~(2+). The energy transfer process was confirmed by the luminescence spectra, transmittance spectra, and the calculation of energy transfer efficiency of the glasses. Meanwhile, the potential mechanism of energy transfer is evident to be dipole-di-pole interaction. Finally, the Eu~(2+)-Mn~(2+)-codoped borophosphate glasses showed an adjustable full-color emission that could be regarded as a good candidate for ultraviolet light-emitting diode (LED) chip-based white LEDs.