Photoluminescence Properties of the Magnetoplumbite-Type BaMg sub(6) Ti sub(6) O sub(19):Mn super(4+) and Spinel-Type Mg sub(2) TiO sub(4):Mn super(4+)

• Published in: Materials Science Forum Vol. 868; pp. 73 - 78
• Main Authors: Sasaki, Takuya, Fukushima, Jun, Hayashi, Yamato, Takizawa, Hirotsugu
• Format: Journal Article
• Language: English
• Published: 01.08.2016
• Subjects: Crystals; Emission; Magnetic properties; Parameters; Phosphors; Photoluminescence; Titanium dioxide; Wavelengths
• ISBN: 3038357715; 9783038357711
• ISSN: 0255-5476; 1662-9752
• DOI: 10.4028/www.scientific.net/MSF.868.73

Mn super(4+)-doped magnetoplumbite-type BaMg sub(6) Ti sub(6) O sub(19) and spinel-type Mg sub(2) TiO sub(4) red phosphors were synthesized by a solid-state reaction. BaMg sub(6) Ti sub(6) O sub(19):Mn super(4+) and Mg sub(2) TiO sub(4):Mn super(4+) were formed as main phase above 1200 oC. Although the emission peak of BaMg sub(6) Ti sub(6) O sub(19):Mn super(4+) and Mg sub(2) TiO sub(4):Mn super(4+) were almost the same, the excitation peak of BaMg sub(6) Ti sub(6) O sub(19):Mn super(4+) and Mg sub(2) TiO sub(4):Mn super(4+) were different. The super(4) A sub(2) arrow right super(4) T sub(1) transition peak of Mg sub(2) TiO sub(4):Mn super(4+) shifted to a shorter wavelength side than that of BaMg sub(6) Ti sub(6) O sub(19):Mn super(4+) and super(4) A sub(2) arrow right super(4) T sub(2) shifted to a longer wavelength side. The crystal field splitting energy of Mg sub(2) TiO sub(4):Mn super(4+) was lower than that of BaMg sub(6) Ti sub(6) O sub(19):Mn super(4+). 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.