Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 50, Issue 11, Pages 6283-6290Publisher
SPRINGER
DOI: 10.1007/s11664-021-09149-3
Keywords
Phosphor; KCaLa(PO4)(2); Ce3+; Dy3+; abnormal thermal quenching behavior
Categories
Funding
- 2019 Special Funds for the Development of Local Colleges and Universities - Central Finance
- Science and Technology Program of Guangzhou, China [20200203009]
- National Natural Science Foundation of China [11604056, 11804057]
Ask authors/readers for more resources
The Ce3+/Dy3+ co-doped KCaLa(PO4)(2) phosphors exhibit excellent thermal stability and high energy transfer efficiency, making them a promising candidate for white LED applications.
The luminous efficiency of the phosphors usually decreases as the operating temperature increases. Thermal stability is a crucial parameter for phosphors. The Ce3+/Dy3+ co-doped KCaLa(PO4)(2) phosphors exhibited excellent thermal stability attributing to abnormal thermal quenching behavior. The energy exchange between trap charges and the level of Dy3+ ions may lead to this behavior. The structure of the phosphors was analyzed and studied. Under the excitation at 324 nm, the luminescence properties and energy transfer behavior were investigated in detail for Ce3+/Dy3+ co-doped KCaLa(PO4)(2) phosphors. The energy transfer efficiency from Ce3+ to Dy3+ reached to 85.5% with dipole-quadrupole mode. The color coordinate points of the phosphor gradually move closer to (0.333, 0.333) as the operating temperature increased. Under the excitation at 324 nm, the internal quantum efficiency of the KCaLa0.88(PO4)(2): 0.10Ce(3+), 0.02Dy(3+) phosphor was found to be 41.7%. Excellent thermal stability and high quantum efficiency would make the Ce3+/Dy3+ co-activated KCaLa(PO4)(2) phosphor a promising application for white LEDs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available