Efficient White Polymer Light-Emitting Diode (WPLED) Based on Single-Component Eu~(3+)–Tb~(3+)-Containing Metallopolymer

摘要

Despite the excellent physical properties of single-component Eu3+-Tb3+-containing metallopolymers, the development of their flexible white polymer light-emitting diodes (WPLEDs) for portable full-color flat displays remains a formidable challenge. Herein, the WPLEDs from a metallopolymer Poly(NVK-co-2-co-7) are reported, in which [Eu(DBM)(3)(4-vp-PBI)] (2) and [Tb(tba-PMP)(3)(4-vp-PBI)] (7) with different localized circumstances are grafted into poly(N-vinyl-carbarzole) (PVK). In this design, both Dexter and Forster energy transfers occur, which endow a photoluminescent quantum yield up to 22.3% of the straightforward high-quality white-lights. Contributing from the stepwise alignment of frontier molecular orbitals of Poly(NVK-co-2-co-7) as the emitting layer in combination with CBP- and BCP-assisted carrier-transports, a reliable WPLED with the record-renewed electroluminescent performance (L-Max = 388.0 cd m(-2), eta(Max)(c) = 31.1 cd A(-1), eta(Max)(p) = 15.0 lm W-1, eta(Max)(EQE) = 18.1%, and weak efficiency-roll-off) among previous organo-Ln(3+)-based white organic light-emitting diodes/WPLEDs is achieved. This finding renders a single-component Eu3+-Tb3+-containing metallopolymers a potential new platform to cost-effective flexible WPLEDs for practical applications.