Effect of side chains on color purities of mono-triphenylamine-functionalized polyspirobifluorenes for pure blue polymer light-emitting diodes

Abstract

Large and rigid substituents may facilitate the improvement of the color purity of polyfluorenes.

Electrospun light stimulus response-enhanced anisotropic conductive Janus membrane with up/down-conversion luminescence

“…Significant EM peaks were observed at 520 nm, 580 nm, 593 nm and 615 nm. The EM peak at 520 nm belongs to the aggregation luminescence of DF, 33,34 and the EM peaks at 580 nm, 593 nm and 615 nm are ascribed to the characteristic EM peaks from the 5 D 0 → 7 F 0 , 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 energy levels transition of Eu 3+ in Eu(TTA) 3 (TPPO) 2 , respectively. By using 615 nm as the monitoring wavelength, the strongest EX peak appeared at 350 nm in the EM spectra (Fig.…”

“…Due to the coplanar structure of the conjugated molecules, the DF molecules easily formed dimers through p-p stacking, and due to the existence of carbonyl and Br, hydrogen bonds, C-HÁ Á Áp bonds and strong intermolecular forces dimers were also easily formed. 33,34 Dimers are transformed into excimers upon exposure to excitation light, and the subsequent aggregation emission of DF results from the formation of excimers. The intensity of the EM peaks at 580, 593 and 615 nm remained basically unchanged because there was no interaction between DF and Eu(TTA) 3 (TPPO) 2 on both regions of the Janus nanobelts (Fig.…”

Synthesis of poly(9,9-dioctylfluorene) in a rotating packed bed with enhanced performance for polymer light-emitting diodes

“…Polymer light-emitting diodes (PLEDs) based on conjugated polymers have attracted much attention due to their potential applications in flat panel displays and solid-state lighting. [1][2][3] The organic electroluminescent devices combine the basic features of self-luminescence, full colour, and wide viewing angle with the outstanding advantages of solution processability, flexibility, and low cost, which are closely related to conjugated polymers. [4][5][6] The delocalized π system created by molecularstructural interactions brings semiconducting behaviour to conjugated polymers.…”

2,2′-Bipyrimidine as a Building Block for the Design of Emissive Conjugated Polymers for Hybrid LED Lighting

“…Thus, they have been widely investigated as blue emitters or matrices in electroluminescent devices. [10][11][12][13][14][15][16][17][18][19] Comparatively, conjugated polymers have only very rarely been investigated as phosphors for LED lighting. [20][21][22][23][24][25][26][27] Especially, the literature dealing with investigations on the photostability of such phosphors is almost virgin.…”

“…Especially, polyfluorene derivatives have attracted a great deal of attention thanks to both their high emission efficiency in the visible, in particular in the blue, and their semiconducting properties. Thus, they have been widely investigated as blue emitters or matrices in electroluminescent devices. − Comparatively, conjugated polymers have only very rarely been investigated as phosphors for LED lighting. − Especially, the literature dealing with investigations on the photostability of such phosphors is almost virgin.…”