Efficient White Polymer Light‐Emitting Diode (WPLED) Based on Single‐Component Eu³⁺–Tb³⁺‐Containing Metallopolymer

Abstract

Abstract Despite the excellent physical properties of single‐component Eu 3+ –Tb 3+ ‐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 Förster 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 , η c Max = 31.1 cd A −1 , η p Max = 15.0 lm W −1 , η EQE Max = 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 Eu 3+ –Tb 3+ ‐containing metallopolymers a potential new platform to cost‐effective flexible WPLEDs for practical applications.