Size-tunable crystalline core-crystalline shell Zn2GeO4 nanorods were synthesized via a facile hydrothermal reaction. High purity Zn2GeO4 nanorods were obtained at pH = 7. The length of Zn2GeO4 nanorods (L = 50-100 nm) can be controlled through a one-step process, while micro-sized nanorods with an aspect ratio of the length to the diameter of 10 were yielded in a two-step process. The single crystalline nature of Zn2GeO4 nanorods with a core-shell structure was verified by high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) measurements. The Raman study revealed that there is no oxygen defect in Zn2GeO4 nanocrystals, suggesting that photoluminescence emission of Zn2GeO4 can be attributed to the presence of the interstitial Zn defect in Zn2GeO4 nanocrystals. As the diameter of nanorods decreased, the excitation and emission peaks appeared to be redshifted due to the quantum size effect.
Correction for 'Core-shell Zn2GeO4 nanorods and their size-dependent photoluminescence properties' by Songping Wu et al., Nanoscale, 2013, 5, 12335-12341.
Efficient, good color quality, two-component single-emitting layer fluorescent white organic light emitting diode (WOLED) has been developed using a novel 2-substitutd-8-hydroxyquinoline derivative, (E)-2-(2-(9-p-toly1-9H-carbazo1-3-y1)viny1) quinolin-Zinc(MCzHqZn), as yellow dopant. The WOLED with the optimizing MCzHqZn-doped concentration of 2 wt% exhibits maximum current efficiency of 2.3 cd/A with the Commission Internationale del'Eclairage (CIE) coordinates of (0.320, 0.347). From the brightness at 1000 to 5000 cd/m 2 , the current efficiency roll-off of the device is 9.0%. White light emission is achieved by combining blue and yellow emissions emitted from NPB and MCzHqZn, respectively. The MCzHqZn emission is mainly attributable to the direct carrier trapping (DCT) at the dopant sites. Moreover, the WOLED exhibits excellent color stability, high color rendering index (CRI) and appropriate correlated color temperature (CCT) in a wide range of voltage. The CIE coordinate region is (0.310-0.324, 0.333-0.335) at various current density (20-858 mA/cm 2 ), corresponding CRI of (78-81). The CIE coordinates correspond to CCT is 5914 K at 8532 cd/m 2 .
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