Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 8, Issue 23, Pages 5113-5123Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1qi01033f
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Funding
- Fundamental Research Funds for the Central Universities [lzujbky-2021-it32]
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The study focused on a new type of Ce3+/Mn2+ doped CYHAO garnet phosphor which can be efficiently excited by n-UV light, exhibiting a wide excitation band, tunable color emission, and high efficiency for producing white light LEDs.
It is of great significance for white light-emitting diodes (wLEDs) to explore new, efficient and stable inorganic phosphors excited by wideband near-ultraviolet (n-UV) light. A new type of efficient emission-tunable Ce3+/Mn2+ doped Ca2YHf2Al3O12 (CYHAO) garnet phosphor which can be excited by n-UV light is studied in this work. Due to the effective energy transfer (ET) from Ce3+ to Mn2+ in CYHAO, CYHAO:0.09Ce(3+),xMn(2+) phosphors have a wide excitation band in the 370-470 nm region with a peak at 410 nm. Under excitation at 410 nm, all the samples show tunable color emission and match with the near UV chip. Through the decay time, it is determined that the energy transfer efficiency is as high as 88.83%. The calculated activation energy is about 0.217 eV, indicating the relatively good thermal stability. The cathodoluminescence (CL) properties show that the phosphor has a high saturation current and saturation voltage. A single component white LED is fabricated by using the CYHAO:0.09Ce(3+),0.3Mn(2+) phosphor and a 400 nm n-UV chip. It is worth noting that the detailed study of the energy transfer mechanism, thermal quenching mechanism and CL mechanism has reference value for the development of new co-doped phosphors.
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