Polycarbonate films with added

Figure 26 Emission spectra (PL, EL) in PC at room temperature of 40 wt% TPD donor solution with a 40 wt% of PBD acceptor added. The photoluminescence (PL) spectrum excited at 360 nm, the electroluminescence (EL) spectra (I, II) originate from the recombination radiation in a 60 nm thick film, taken at two different voltages. Absorption (Abs) and PL spectra (excitation at 360 nm) of (75wt% TPD 25wt% PC) and (75wt% PBD 25wt% PC) spin-cast films are given for comparison. Molecular structures of the compounds used are given in the upper part of the figure TPD [N,Nf-diphenyl-A v/V/-bis(3-methylphenyl)-l,l -biphenyl-4,4 diamine PBD [2-(4-biphenyl)-5-(4- er .-butylphenyl)l,3,4-oxadiazole PC[bisphe-nol-A-polycarbonate]. Adapted from Ref. 112.

In some applications in the electrical and electronics industries PES is being used because its properties are necessary in the manufacture of the component rather than its in-service requirement. For example, in one established application PES is used for the coil formers of a line output transformer that is used in a oolour TV set to produce the 2 Kv for operation of the electron beam During normal use, temperatures above 173 F are rarely reaohed and therefore on tMs ba s alone several materials were contenders, with PES an expensive option PES was selected eventually because the former must withstand the 340-360°F baking temperature required to shrink the stretched polycarbonate interleaving film on the windings, and because if offered satisfactory electrical performance during use. The non-biu ning characteristics of PES are an added bonus for this type of application ... 

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