Photoluminescence Properties of the Magnetoplumbite-Type BaMg₆Ti₆O₁₉:Mn⁴⁺ and Spinel-Type Mg₂TiO₄:Mn⁴⁺

Abstract:

Mn⁴⁺-doped magnetoplumbite-type BaMg₆Ti₆O₁₉ and spinel-type Mg₂TiO₄ red phosphors were synthesized by a solid-state reaction. BaMg₆Ti₆O₁₉:Mn⁴⁺ and Mg₂TiO₄:Mn⁴⁺ were formed as main phase above 1200 oC. Although the emission peak of BaMg₆Ti₆O₁₉:Mn⁴⁺ and Mg₂TiO₄:Mn⁴⁺ were almost the same, the excitation peak of BaMg₆Ti₆O₁₉:Mn⁴⁺ and Mg₂TiO₄:Mn⁴⁺ were different. The ⁴A₂→⁴T₁ transition peak of Mg₂TiO₄:Mn⁴⁺ shifted to a shorter wavelength side than that of BaMg₆Ti₆O₁₉:Mn⁴⁺ and ⁴A₂→⁴T₂ shifted to a longer wavelength side. The crystal field splitting energy of Mg₂TiO₄:Mn⁴⁺ was lower than that of BaMg₆Ti₆O₁₉:Mn⁴⁺. By the additional of R block, the racah parameter B increased and C decreased. Although the increase of B causes a blue-shift of the emission wavelength and the decrease of C causes a red-shift of the emission wavelength, PL emission wavelength was little different due to the influence of both racah parameter. Thus, it was suggested that the existence of R block results in a difference of photoluminescence properties.

• Periodical: Materials Science Forum (Volume 868)
• Pages: 73-78
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.868.73
• Online since: August 2016
• Authors: Takuya Sasaki*, Jun Fukushima, Yamato Hayashi, Hirotsugu Takizawa
• Keywords: BaMg₆Ti₆O₁₉, Mg₂TiO₄, Mn⁴⁺, Phosphor, Photoluminescence

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DOI: 10.1149/2.0091601jss