Solution processed single-emission layer white polymer light-emitting diodes with high color quality and high performance from a poly(N-vinyl)carbazole host

Physical Chemistry Chemical Physics : PCCP
Shanghui YeWei Huang

Abstract

Low cost and high performance white polymer light-emitting diodes (PLEDs) are very important as solid-state lighting sources. In this research three commercially available phosphors were carefully chosen, bis[2-(4,6-difluorophenyl)pyridinato-N,C(2)](picolinate)iridium(III) (FIrpic), bis[2-(2-pyridinyl-N)phenyl-C](2,4-pentanedionato-O(2),O(4))iridium(III) [Ir(ppy)2(acac)], and bis(2-phenyl-benzothiazole-C(2),N)(acetylacetonate)iridium(III) [Ir(bt)2(acac)], plus a home-made red phosphor of tris[1-(2,6-dimethylphenoxy)-4-(4-chlorophenyl)phthalazine]iridium(III) [Ir(MPCPPZ)3], and their photophysical and morphological properties were systematically studied as well as their applications in single-emission layer white PLEDs comprising poly(N-vinylcarbazole) as host. Additionally, the electrochemical properties and energy level alignment, possible energy transfer process, and thin-film morphology were also addressed. The binary blue/orange complementary white PLEDs exhibit stable electroluminescence spectra, wide spectrum-covering region range from 380-780 nm, and high color rendering index (CRI) over 70 with Commission Internationale de l'Eclairage coordinates x,y (CIEx,y) of (0.388, 0.440), correlated color temperature (CCT) of arou...Continue Reading

References

May 16, 2009·Nature·Sebastian ReinekeKarl Leo
Oct 27, 2010·Advanced Materials·Malte C GatherKlaus Meerholz
Dec 19, 2013·Physical Chemistry Chemical Physics : PCCP·Boris MinaevHans Agren

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Citations

Jan 3, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Kassio P S ZanoniAndrea S S de Camargo
May 10, 2018·Scientific Reports·Meenu SinghChing-Wu Wang

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