Photoluminescence tuning in a novel Bi3+/ Mn4+co- doped La2ATiO6:( A = Mg, Zn) double perovskite structure: phase transition and energy transfer : научное издание | Научно-инновационный портал СФУ

Photoluminescence tuning in a novel Bi3+/ Mn4+co- doped La2ATiO6:( A = Mg, Zn) double perovskite structure: phase transition and energy transfer : научное издание

Тип публикации: статья из журнала

Год издания: 2018

Идентификатор DOI: 10.1039/c8tc05171b

Ключевые слова: Biogeochemistry, Biological materials, Carbon dioxide, Greenhouse gases, Organic compounds, Permafrost, Rivers, Current estimates, Fundamental research, Greenhouse gas production, Greenhouse gas release, Incubation study, Microbial decomposition, Microbia

Аннотация: Red-emitting phosphors are indispensable compounds which are used to achieve a warm white light in phosphor-converted white light emitting diodes (pc-WLEDs). However, the luminous efficiency and stability of red phosphors are still big challenges. In this work, we developed red-emitting double perovskite phosphors La(2)ATiO(6):Bi3+,Mn4+ (A = Mg, Zn) (LAT:Bi3+,Mn4+) and discuss the relationship between the double perovskite phosphor structure and the luminescence performance in detail. According to the Rietveld refinement results for the La2Mg(1-w)ZnwTiO6:Bi3+,Mn4+ (0 w 1) (LM((1-w))Z(w)T:Bi3+,Mn4+) solid solution, the proposed mechanism of the spectral adjustment is ascribed to the appearance of the phase transition, which results in a lower local structural symmetry of the [LaO12] polyhedron and the variation of the crystal field environment for Mn4+. Notably, this is the first time that the influence of the local structure variation on the luminescence tuning in double perovskite structure phosphors has been revealed, and this could offer guidance for the development of new phosphor system. By designing Mg2+/Zn2+ cation substitution, the internal quantum efficiency (IQE) is remarkably enhanced beyond 20%. In addition, we succeeded in achieving a Bi3+/Mn4+ co-doped energy transfer in the double perovskite structure phosphors. Owing to the Bi3+ Mn4+ energy transfer in LAT, the red emission of the Mn4+ ions could be dramatically enhanced. The energy transfer efficiency of LAT:Bi3+,Mn4+ eventually exceeded 90%. The IQE and the thermal stability were all enhanced by around 30% compared to the non-co-doped samples, respectively. These results indicate that the Bi3+ Mn4+ energy transfer strategy could play a pivotal role in the development of highly efficient red-emitting phosphors. The performance of the fabricated pc-WLEDs devices indicates that LAT:Bi3+,Mn4+ could be a promising red phosphor for near ultraviolet (n-UV) based warm pc-WLEDs. A fundamental research question related to the impact of thawing permafrost on global change is, how fast organic matter in the thawing permafrost can be converted to CO2 and CH4 and released into the atmosphere. Current estimates on the degradability of A fundamental research question related to the impact of thawing permafrost on global change is, how fast organic matter in the thawing permafrost can be converted to CO2 and CH4 and released into the atmosphere. Current estimates on the degradability of

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Издание

Журнал: JOURNAL OF MATERIALS CHEMISTRY C

Выпуск журнала: Vol. 6, Is. 48

Номера страниц: 13136-13147

ISSN журнала: 20507526

Место издания: CAMBRIDGE

Издатель: ROYAL SOC CHEMISTRY

Авторы

  • Xing Gongcheng (China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeomat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China)
  • Feng Yuxin (China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeomat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China)
  • Pan Min (China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeomat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China)
  • Wei Yi (China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeomat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China)
  • Li Guogang (China Univ Geosci, Fac Mat Sci & Chem, Minist Educ, Engn Res Ctr Nanogeomat, 388 Lumo Rd, Wuhan 430074, Hubei, Peoples R China)
  • Dang Peipei (Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Jilin, Peoples R China)
  • Liang Sisi (Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Jilin, Peoples R China)
  • Molokeev Maxim S. (FRC KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia; Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia; Siberian Fed Univ, Krasnoyarsk 660041, Russia)
  • Cheng Ziyong (Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Jilin, Peoples R China)
  • Lin Jun (Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Rare Earth Resource Utilizat, Changchun 130022, Jilin, Peoples R China; Wuyi Univ, Sch Appl Phys & Mat, Jiangmen 529020, Guangdong, Peoples R China)

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