The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 2,5-Diphenyloxazole( cas:92-71-7 ) is researched.Safety of 2,5-Diphenyloxazole.Nabha-Barnea, Shiran; Gotleyb, Dor; Yonish, Adi; Shikler, Rafi published the article 《Relating transient electroluminescence lifetime and bulk transit time in OLED during switch-off》 about this compound( cas:92-71-7 ) in Journal of Materials Chemistry C: Materials for Optical and Electronic Devices. Keywords: electroluminescence transient lifetime bulk transit time organic LED switchoff; diode light emitting organic transient lifetime transit time switchoff; electroluminescent device organic transient lifetime transit time switchoff. Let’s learn more about this compound (cas:92-71-7).
A study on the dependence of the transient electroluminescence lifetimes in polyfluorene blend-based LEDs on the injection efficiency during the turn-off cycle is presented. Using a specially designed driver that minimizes the interaction of the outer switch-off circuit with the diode, were able to keep the light intensity continuous during the switching and allow the study of the dynamic mechanisms of intrinsic charge. A bi-exponential decay of the transient electroluminescence, a fast decay with a lifetime of tens of nanoseconds, followed by a slow decay with a lifetime of hundreds of nanoseconds was observed The slow lifetime increases, by >25%, with the increase in the injection efficiency, controlled by varying the thickness of a LiF injection layer. The slow decay is attributed to the transit time via the drift of the mobile charges between the space charge regions during discharge. This hypothesis was tested and verified using 2 methods that affect the elec. field in the bulk region. In the 1st the thickness of the active layer was controlled, and in the 2nd the applied operation voltage was varied. Based on this model, the variation in the thickness of the injection layer influences the width of the space-charge region and hence influences the division of the voltage drop between the space charge regions and the bulk. Under a constant applied voltage, devices with higher injection efficiency have a smaller elec. field in the bulk, and therefore, a longer transit time, which correlates with the EL decay lifetime. These observations are supported by simulation based on the drift-diffusion model.
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Reference:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica