Efficient and high colour-purity green-light polymer light-emitting diodes (PLEDs) based on a PVK-supported Tb3+-containing metallopolymer

Abstract

Based on the free-radical copolymerization of the green-light complex monomer [Tb(eb-PMP)₃(4-VB-PBI)] (2; Heb-PMP = 4-(2-ethylbutanoyl)-1-phenyl-3-methyl-1H-pyrazol-5(4H)-one; 4-VB-PBI = 1-(4-vinylbenzyl)-(pyridin-2-yl)-1H-benzo[d]imidazole) with NVK (N-vinylcarbazole), the obtained Tb³⁺-containing metallopolymer poly(NVK-co-2) with an energy transfer from additional PVK to Tb³⁺ ion was used as the emitting material of polymer light-emitting diodes (PLEDs); it exhibited record renewed efficiencies (24.63 cd A⁻¹, 7.81%, and 6.45 lm W⁻¹) of Tb³⁺-based extreme colour-purity green-light PLEDs and superior performance of colour-stability and low efficiency roll-off to small-molecule Tb³⁺-complex's OLEDs.