Abstract
In this study, the yellow emitting cubic structure of Sr 0.95 Zn 0.05 Se:Eu 2+ phosphors were prepared by high temperature solid state reaction. The Sr 0.95 Zn 0.05 Se:Eu 2+ phosphors exhibited strong excitation intensity under 400-460 nm region, and broad band emission appeared at around 545-600 nm due to the d-f transition of Eu 2+. To enhance the red emission, HDA/TOP/TOPO capped CdSe/ZnS NCs were synthesized via fast nucleation and slow growth method. The narrow emission peak was located at 615 nm with 69% of high quantum yield. Bright white emission was generated by combining a 460 nm InGaN LED chip with CdSe/ZnS NCs and Sr 0.95 Zn 0.05 Se:Eu 2+ hybrid phosphors. The fabricated white LEDs showed warm white light with acceptable CIE chromaticity coordinate variation from (0.343, 0.255) at 20 mA to (0.335, 0.250) at 50 mA. The addition of CdSe/ZnS NCs contributed to the extension of white light spectrum by supplement of the red region. The color rendering index was largely enhanced from 41.7 to 79.7 compared to the Sr 0.95 Zn 0.05 Se:Eu 2+ based phosphors white LED.
Original language | English |
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Pages (from-to) | 6069-6073 |
Number of pages | 5 |
Journal | Journal of Nanoscience and Nanotechnology |
Volume | 12 |
Issue number | 7 |
DOIs | |
Publication status | Published - 2012 Jul |
Keywords
- CdSe/ZnS
- Color Rendering Index
- SrSe
- White Light Emitting Diodes
ASJC Scopus subject areas
- Bioengineering
- Chemistry(all)
- Biomedical Engineering
- Materials Science(all)
- Condensed Matter Physics