3: 0.09 g (0.5 mmol) Ferrocen, 0.06 g (0.25 mmol) I2 und 0.25 g (0.5 mmol) Sbl, werden nacheinander in 150 mL CH,CN unter Erwarmen gelost. Innerhalb van I d bei Raumtemperatur kristallisieren schwarze, kompakte Kristalle in 82% Ausbeute; befriedigende C,H,Fe,l-Analyse.
Eingegangen am 21. Oktober 1988 [Z 30211[I] K.
850 1090A uniform array of gallium nitride core-shell microrod (MR) lightemitting diode (LED) structures was grown by metalorganic vapor phase epitaxy. Defects and the quantum well (QW) luminescence in an individual rod were investigated by scanning tunneling electron microscopy (STEM) and STEM cathodoluminescence. Luminescence with different wavelength was detected from the quantum wells on the semipolar tip facets and the nonpolar sidewalls of the MRs. Furthermore, the MR array is processed into LED chips. The electro-optical characteristics of the devices are analyzed. Two separate emission bands are distinguished, which are attributed to the QWs on the semipolar tip facets and the nonpolar sidewalls, respectively. To obtain white LEDs, micrograin phosphors were developed which fit in between individual MRs. By using electrophoretic particle deposition, these phosphors are deposited onto the MR LED chips. Color coordinates, color temperature, and device efficiency are evaluated.Blue (top) and phosphor-converted white (bottom) microrod LEDs on 4 00 wafer.
Genügend starke anionische Nucleophile X− bauen weißen Phosphor unter mehr oder weniger weitgehender Disproportionierung ab. Mit Kronenether‐Alkali‐, Ammonium‐ oder Phosphoniumcyaniden, X− = CN−, entsteht dabei selektiv das entsprechende Dicyanphosphid, P(CN)2−, und ein Polyphosphid, bevorzugt P15−.
[18] Krone‐6‐KP(CN)2 entsteht auch bei der Umsetzung von P(CN)3 mit KF und Kronenether. Im Kristall dieses Salzes sind die am Phosphor (um 95°) gewinkelten Dicyanphosphid‐Anionen mit beiden Stickstoffenden an je ein Kation koordiniert. Der PC‐Abstand ist (mit durch‐schnittlich 168 pm) so kurz wie in Phosphaalkenen. δ13C und JPC von P(CN)2− ordnen sich gut in einen für Cyanphosphorverbindungen allgemein geltenden Zusammenhang mit der Ladungsdichte am Phosphor ein.
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