Intense deep-red zero phonon line emission of Mn4+ in double perovskite La4Ti3O12
- Zhengzhou Univ. (China); Kyoto Univ. (Japan)
- Kyoto Univ. (Japan)
- Chongqing Univ. of Posts and Telecommunications (China); Univ. of Tartu (Estonia)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Zhengzhou Univ. (China)
Phosphors that emit in the deep-red spectral region are critical for plant cultivation light-emitting diodes. In this work, ultrabroadband deep-red luminescence of Mn4+ in La4Ti3O12 was studied, which showed intense zero phonon line emission. The double-perovskite structural La4Ti3O12 simultaneously contains two Ti4+ sites forming slightly- and highly-distorted TiO6 octahedra, respectively. The influence of octahedral distortion on the Mn4+ emission energy in the two distinct Ti4+ sites was studied both experimentally and theoretically. The spectral measurements indicated that Mn4+ in La4Ti3O12 showed intense zero phonon line emission (ZPL) at deep-red 710–740 nm under excitation of 400 nm charging the O2- → Mn4+ charge transfer transition. The splitting of the ZPL of the Mn4+ 2Eg → 4A2g transition as well as the intensity of ZPL relative to the vibronic phonon sideband emissions were found to be greatly influenced by the degree of octahedral distortion. The crystal-field strength and Racah parameters of Mn4+ in each Ti4+ site were also estimated. The Mn4+ 2Eg → 4A2g luminescence exhibited severe thermal quenching, which was explained by the low-lying 4T2g level and charge-transfer state.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1607041
- Alternate ID(s):
- OSTI ID: 1573269
- Journal Information:
- Physical Chemistry Chemical Physics. PCCP, Vol. 21, Issue 45; ISSN 1463-9076
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mn4+/Zn2+:YAG glass ceramic for light emitting devices
Photoluminescence and energy transfer in Tb{sup 3+}/Mn{sup 2+} co-doped ZnAl{sub 2}O{sub 4} glass ceramics