ABSTRACT
A novel single-phase luminescent material, Ln@bio-MOF-1 (Ln: Tb3+ and Eu3+), was synthesized by a facile hydrothermal method. The structural and luminescence characteristics of the MOF materials were studied in detail. The chromaticity of the as-prepared samples might be easily modulated using molar amounts of Tb3+ and Eu3+. Sample Tb/Eu@bio-MOF-1 (1) demonstrates a white emission (CIE coordinates: 0.328, 0.338), which is very close to the standard white light (0.333, 0.333). Tb/Eu@bio-MOF-1 (1) has a quantum yield of 52.9%, which is higher than those in most reported works. The corresponding LED devices were prepared to further explore the possible applications of Ln@bio-MOF-1 in WLEDs. The achieved LED device has a high color rendering index (CRI) of 86.2 and a low correlated color temperature (CCT) of 4725 K, which indicates that Tb/Eu@bio-MOF-1 (1) might be a feasible luminescent material for WLED applications.
ABSTRACT
OBJECTIVE: To classify Pueraria lobata originated from different geographical regions based on ITS,psbK-psbI and trnH-psbA information. METHOD: Twenty-four samples of P. lobata were collected from northeast China, north China, central China and northwest China. DNA extraction, PCR, sequence and genotypes/haplotypes analysis were performed . RESULT: ITS1, 5.8S and ITS2 varied only 1 bp respectively, psbK-psbI 2 bps; trnH-psbA varied 1 bp and 10 bp deletion. CONCLUSION: Based on the variation of ITS,psbK-psbI and trnH-psbA, 4 genotypes and 2 haplotypes were identified, respectively.
