Defect engineering towards anti-temperature quenching luminescence for application in light emitting diodes |
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| Affiliation: | 1. Centro de Química Estrutural, Institute of Molecular Sciences and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal;2. Laboratory of Applied Organic Chemistry, Faculty of Chemistry, University of Science and Technology, Houari Boumediene, BP 32, Alia Bab-Ezzouar, 16111, Algiers, Algeria;3. IFN: Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Portugal;1. High Temperature Energy Conversion Laboratory, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea;2. Department of Advanced Energy and Technology, University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea;3. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, 16419, Republic of Korea |
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| Abstract: | Thermal quenching (TQ) that weakens luminescent intensity is crucial for the application value of a phosphor. Here, we report a series of color-tunable phosphors Na2MgAl10O17:xEu2+ (NMA:xEu2+) from green to cyan. For optimized Eu2+ concentration of x = 0.15, its internal and external quantum efficiency can reach up to 86% and 43%, respectively. In addition, it is unexpected that NMA:0.15Eu2+ exhibits anti-temperature quenching (TQ) luminescence even up to 300 °C, which is due to the ability of the defect energy levels to counteract the usual loss of emission by TQ through EPR and TL spectral analysis. Then, a prototype w-LED lamp by using NMA:0.15Eu2+ cyan phosphor, CaAlSiN3:Eu2+ red phosphor, and 380 nm LED chip is fabricated. This work not only reports a new phosphor with high efficiency and good thermal stability of luminescence, but also brings forward a defect engineering approach for enhancing the thermal quenching resistance of a phosphor. |
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| Keywords: | High quantum efficiency Anti-temperature quenching Phosphor LEDs |
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