Efficient green OLED devices with an emissive layer comprised of phosphor-doped carbazole/bis-oxadiazole side-chain polymer blends

Carbazole-based polymers as hosts for solution-processed organic light-emitting diodes: Simplicity, efficacy

“…1) [74][75][76], and it still constitutes a reference for evaluating device performances of the newly synthesized carbazole-based polymeric hosts. PVK is a unipolar hole transporter so that it must be blended with a large amount of electron transport materials to achieve a balanced charge carrier transportation [77].…”

Red Emitting Coumarins: Insights of Photophysical Properties with DFT Methods

“…The red emitting dyes are important in OLEDs to complement their blue [9,10] and green [11,12] dye counterparts in fabrication of displays. In biological applications, red emitting dyes stand high and apart due to their ability to produce emission signals discrete from the autofluorescence [13][14][15] of biomolecules (195-600 nm), low energy excitation and emission in biological window [16,17].…”

Enabling high-efficiency organic light-emitting diodes with a cross-linkable electron confining hole transporting material

“…The VPEC shows a hole mobility 42 of 1 Â 10 À4 cm 2 V À1 s À1 and a triplet energy of 2.88 eV. Most importantly, the VPEC not only works for 43 devices containing low band-gap red or green emitters, but also for the counterpart with high 44 band-gap blue emitter. With the electron confining hole transporting material, the power efficiency of 45 a studied red device, at 1000 cd m À2 for example, is increased from 8.5 to 13.5 lm W À1 , an increment 46 of 59%, and the maximum luminance enhanced from 13,000 to 19,000 cd m À2 , an increment of 46%.…”

“…83 Nevertheless, several efficient wet-processed OLEDs, especially 84 with a solution-processable emissive layer, have been reported. 85 They include the employment of electroluminescence effective 86 dyes [43][44][45][46][47] and hosts [48][49][50][51][52][53] [62]. 119 By using cross-linkable spirobifluorene-co-fluorene electrolumi-120 nescent polymers, Meerholz's group reported a maximum cur-121 rent efficiency of 1.1 cd A À1 for a red device, 6.5 cd A À1 for a 122 green device, and 3.0 cd A À1 for a blue device [63], and a maxi-123 mum efficacy of 11.3 lm W À1 for a blue device with a 124 cross-linkable TAPC-based HTL to reduce efficiency roll-off [64].…”