研究目的
Improving the moisture-stability of the narrow-band green-emitting RbLi(Li3SiO4)2:Eu2+ (RLSO:Eu2+) phosphor for its application in high-power LED backlights.
研究成果
The dual-shelled RLSO:Eu2+@Al2O3@ODTMS composite phosphor exhibits good moisture stability and maintains 76% of its initial emission intensity after immersion in water for one hour. The white LED device fabricated using this phosphor shows promising performance for high-power LED backlights.
研究不足
The coating layers are not fully transparent, resulting in a slight decrease in absorption and quantum efficiency. The thickness and uniformity of the coating layers need precise control to avoid significant reduction in emission intensity.
1：Experimental Design and Method Selection:
A combined surface coating and hydrophobic modification method was used to construct a stable dual-shelled hybrid protective layer outside the RLSO:Eu2+ phosphor. ALD was performed to coat alumina on the surface of RLSO:Eu2+ to form an ultrathin, inorganic dense layer, followed by hydrophobic surface modification with ODTMS.
2：Sample Selection and Data Sources:
RLSO:Eu2+ phosphor was used as the base material. The samples were characterized using XRD, FTIR, SEM, TEM, XPS, and PL measurements.
3：List of Experimental Equipment and Materials:
Equipment included ALD system, SEM, TEM, XPS, FTIR spectrometer, and PL spectrometer. Materials included RLSO:Eu2+ phosphor, TMA, ODTMS, and Al2O
4：Experimental Procedures and Operational Workflow:
The RLSO:Eu2+ phosphor was first coated with Al2O3 by ALD, then modified with ODTMS to form a hydrophobic layer. The samples were characterized before and after coating/modification.
5：Data Analysis Methods:
The data were analyzed to evaluate the structural, morphological, and optical properties of the samples, as well as their moisture-resistant performance.
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