Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 122, Issue 14, Pages 7849-7858Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b00683
Keywords
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Funding
- National Basic Research Program of China [2014CB643801]
- National Natural Science Foundation of China [51702057]
- China Postdoctoral Science Foundation [2017M622627]
- Major Program for Cooperative Innovation of Production, Education & Research of Guangzhou City [201704030106, 201604016029]
- Science and Technology Planning Projects of Guangdong Province of China [2014B050505020, 2016201604030035]
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Nitride La3Si6N11:Ce3+ is an important commercial phosphor for high-power white light-emitting diodes due to its strong resistance toward thermal quenching and sufficient emission efficiency. However, the underlying mechanisms of this high performance is still a mystery. Also, the emission properties of Ce3+ in two kinds of crystallo-graphic sites are currently in dispute. Here, we confirmed the yellow emission ascribed to Ce-La(2) luminescence center and proposed a blue emission owning to Ce-La(1) luminescence center through both theoretical and experimental methods. Particularly, we find an unusual efficient and fast energy transfer from Ce-La(1) to Ce-La(2) due to a large spectral overlap between the emission of Ce-La(1) and the absorption of Ce-La(2), and efficient electron transfer from defects to 5d orbital at high temperature, which shows high relevance to the highly efficient yellow emission and thermal stability of this material. This study presents a full and new understanding toward this special phosphor and provides useful insights into designing highly efficient and thermally stable luminescent materials for future lighting.
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