Polymer light-emitting electrochemical cell structure

Figure 4.21 Schematic of the polymer light-emitting electrochemical cell (PLEC) structure with an inset of a powered PLEC. From Zhang Z, Kunping G, Yiming L, Xuey L, Guozhen G, Houpu L, et al. A colour-tunable, weavahle fibre-shaped polymer light-emitting electrochemical cell. Nat. Photonics 2015 9 233-8.

Copolymers containing alternating l,4-bis(phenylethenyl)benzene, l,4-bis(phenylethenyl)-2,5-dimethoxybenzene or l,5-bis(phenylethenyl)naphthalene chromophores, and dibenzo-24-crown-8 spacers within the polymer backbone, best represented by 87, showed blue light emission in solution, and tunable photoluminescence and electroluminescence depending on the structure of the chromophore. Blends of these copolymers with a small amount of poly(ethylene oxide), and lithium salt as active layers, form efficient light-emitting electrochemical cells <2003JMC800>. 

Lee. T. W. Lee. H. C. Park. O. O. (2002). High-efficiency polymer hght-emitting devices using organic salts A multilayer structure to improve light-emitting electrochemical cells. Applied Physics Letters, vol. 81, no. 2, 214-7. 

Tables 6-9 give the device structures and performance metrics for monochromatic OLEDs that utilize organometallic emitters. Eigures 38-42 show the molecular structures for the various materials used in these devices. White OLEDs have also been prepared with these materials, but these will be discussed in a later section. Light-emitting electrochemical cells are treated in a separate section as well, since the finished devices have different operating characteristics than either of the other solution or vapor processed devices. Table 6 lists devices made solely with discrete molecular materials, while Table 7 gives data for devices made using polymeric materials. The only exception to the use of discrete molecular materials in Table 6 is for devices that use a conducting polymer, poly(3,4-ethylenedioxythiophene polystyrene sulfonate) (PEDOT), as a material to enhance the efficiency for hole injection into the organic layer. The mode of preparation for a given device is listed with the device parameters in the...

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