| Summary: | 碩士 === 國立成功大學 === 化學工程學系 === 86 === Conductive polymers have been succesfully employed as
emmission layer (EML) in organic light-emitting diode (LED)
recently. However, the quantum yield of this electroluminescent
device should be enhanced before its practical application can
be realized. At present, multilayer LED including electron
transport layer (ETL), emission layer (EML), and hole transport
layer (HTL) has been developed and its efficiency greatly
enhanced. Electron transport layer (ETL) is the main factor in
determining the lumin Dibenzoates (3~9) with methylene chain
were prepared by reacting α,ω-dibromoalkane (n =
6,7,8,9,10,11,12) with ethyl 4-hydroxybenzoate (1) in DMAc,
using sodium carbonate as catalyst. After hydrolysis in basic
95% EtOH and followed acidification, dibenzoic acid (10~16) will
result. Aromatic diacid chlorides (ADCn) were synthesized by
reacting dibenzoic acid with thionyl chloride. A series of
polyhydrazides (PEHZn) with various length of methylene chain
was synthesized by polycondensation of equimol Solution
polycondensation in NMP was found to obtain polyhydrazides with
the higher viscosity. The viscosities are between 0.22 and 0.28
dL/g measured at 30℃ in 0.3 g/dL HMPA. The suitable
cyclization temperature of PEHZ10~PEHZ12 was found by
differential scanning calorimetry (DSC). The thermal
cyclization of the polyhydrazides (PEHZ11, PEHZ12) gave the
corresponding poly(1,3,4-oxadiazole)s. The products, PEODZ11
~12, are soluble only in concentrated sulphuric acid.
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