Efficient Blue-emitting Phosphor SrLu2O4:Ce3+ with High Thermal Stability for Near Ultraviolet (~400 nm) LED-Chip based White LEDs
Autor: | Yongshi Luo, Guohui Pan, Zhendong Hao, Jiahua Zhang, Hua-Jun Wu, Ligong Zhang, Liangliang Zhang, Xia Zhang, Haifeng Zhao, Sheng Zhang |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
Multidisciplinary
Photoluminescence Materials science business.industry lcsh:R lcsh:Medicine Phosphor 02 engineering and technology Color temperature 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention law Optoelectronics RGB color model Quantum efficiency Thermal stability lcsh:Q 0210 nano-technology business lcsh:Science Diode Light-emitting diode |
Zdroj: | Scientific Reports, Vol 8, Iss 1, Pp 1-8 (2018) |
ISSN: | 2045-2322 |
Popis: | Blue-emitting phosphors for near ultraviolet (NUV) based tri-color RGB phosphor blend converted white light emitting diodes (LEDs) have been extensively investigated in the past few years. LED chip peaked near 400 nm is the most efficient among the NUV chips currently. However, most of blue phosphors show inefficient excitation around 400 nm. Herein, a novel blue phosphor SrLu2O4:Ce3+ matching well with near 400 nm chip and showing high thermal stability has been developed. The photoluminescence spectrum presents a broad emission band peaking at 460 nm with a bandwidth of nearly 90 nm. By optimizing the Ce3+ concentration, an internal quantum efficiency (IQE) as high as 76% was achieved. Furthermore, 86% of the room-temperature emission intensity is still maintained at 150 °C, indicating a good thermal stability and practicality. A series of white LEDs were fabricated based on 405 nm chips coated with a blend of the new blue phosphor with the commercial yellow and red phosphors. High color rendering indexes (≥90) were achieved while the correlated color temperature was tuneable in the range of 3094 to 8990 K. These results suggest that SrLu2O4:Ce3+ can be utilized as a blue-emitting phosphor in NUV based white LEDs. |
Databáze: | OpenAIRE |
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