Novel splitting of excitation and emission spectra of K2TiF6:Mn4+ phosphors induced by graphene quantum dots.

Autor: Li, Yuelan, Liu, Youmiao, Huang, Haoran, Liao, Sen, Huang, Yingheng, Zhang, Huaxin
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Zdroj: Journal of Materials Science: Materials in Electronics; Jan2021, Vol. 32 Issue 1, p485-495, 11p
Abstrakt: A series of K2TiF6:0.03Mn4+@GQDsymg/mol (KTF:0.03Mn4+@GQDsymg/mol, GQDs: Graphene quantum dots) was prepared by a simple coating method. Multiple enhanced effects on excitation (PLE) & emission (PL) spectra inducing by coating of GQDs are observed: (a) The intensities of PLE&PL are greatly enhanced, (b) PLE&PL spectra have large split, (c) Emission peaks of as-v4, as-v6, s-v4 and s-v3 are selectively enhanced to produce four strong peaks with almost the same intensity. Furthermore, the experimental results indicate that the appearance of the strong as-v4 and as-v6 helps to improve the red light quality of the sample. The mechanism of the enhanced effects is proposed: the coordination of GQDs with Ti4+ and Mn4+ ions leads to the splitting of the crystal field, which further results to enhancement and the large splitting of PLE and PL spectra. Prototype white light-emitting diodes (WLEDs) with low correlated color temperature and high color-rendering index are obtained using the optimal sample. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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