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

Abstract

Despite the excellent physical properties of single-component Eu 3+-Tb 3+-containing metallopolymers, the development of their flexible WPLEDs for portable full-color flat displays remains a formidable challenge. Herein, we report the WPLEDs from a metallopolymer Poly(NVK-co-2-co-7), in which [Eu(DBM) 3 (4-vp-PBI)] (2) and [Tb(tba-PMP) 3 (4-vp-PBI)] (7) with different localized circumstances were grafted into PVK. In this design, both Dexter and Főrster energy transfers occurred, which endowed a photo-luminescent quantum yield up to 22.3% of the straightforward high-quality whitelights. 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 ,  c Max = 31.1 cd/A,  p Max = 15.0 lm/W,  EQE Max = 18.1% and weak efficiency-roll-off) among previous organo-Ln 3+based WOLEDs/WPLEDs was achieved. This finding renders single-component Eu 3+-Tb 3+-containing metallopolymers a potential new platform to cost-effective flexible WPLEDs for practical applications.

Tetraphenylethylene-based Eu3+-metallopolymers with aggregation-enhanced white emission for self-calibrating temperature sensing and white light-emitting diodes (WLEDs)

“…S6, ESI †), noticeably, which is the highest Scheme 1 The synthesis procedure for poly(VTPY-co-VTPE-co-MMA) and Eu 3+ -metallopolymer poly-Eu(TTA) 3 (1-3). among the reported white light emitting Ln 3+ -metallopolymers, 40 Ln 3+ -doping 41 or Ln 3+ -MOF 42 systems, as far as we know, and even comparable to the white light emitting Gd 3+ -Eu 3+ -Tb 3+ -mixed complex (62%). 43 AIE-behavior of the polymer backbone and poly-Eu(TTA) 3 (2) To understand the effect of the VTPE unit on the luminescence properties of poly-Eu(TTA) 3 (2), the AIE behavior of poly(VTPYco-VTPE-co-MMA) and poly-Eu(TTA) 3 (2) was studied.…”

“…It's also worth noting that the white light emitting poly-Eu(TTA) 3 (2) exhibits an extremely high absolute fluorescence quantum yield of 51.99% (see Fig. S6, ESI†), noticeably, which is the highest among the reported white light emitting Ln 3+ -metallopolymers, 40 Ln 3+ -doping 41 or Ln 3+ -MOF 42 systems, as far as we know, and even comparable to the white light emitting Gd 3+ -Eu 3+ -Tb 3+ -mixed complex (62%). 43…”

All-Solution-Processed Multilayered White Polymer Light-Emitting Diodes (WPLEDs) Based on Cross-Linked [Ir(4-vb-PBI)2(acac)]

“…To direct the cross-linked Ir 3+ polymer components from [Ir­(4-vb-PBI) 2 (acac)] , cross-linked Ir 3+ polymer films (40 nm thickness) poly­(NVK- co -[Ir­(4-vb-PBI) 2 (acac)]- co -NVK) (also Scheme ) with the stipulated feeding (50:1, 100:1, 150:1, 200:1, 250:1, or 300:1) were synthesized by AIBN-initiated copolymerization of NVK and [Ir­(4-vb-PBI) 2 (acac)] . As a matter of fact, the PVK matrix with higher-energy-state blue light can also function as both a compensation color and an energy donor to the greenish-yellow emissive [Ir­(4-vb-PBI) 2 (acac)] , from which effective Förster transfer energy (deduced from the significant spectral overlap between the emission of PVK and the absorption of [Ir­(4-vb-PBI) 2 (acac)] ; also shown in Figure ) and desirable dichromatic-integrated white light should be expectable for their cross-linked Ir 3+ polymer films.…”

Bipolar single-component Sm3+-containing metallopolymers capable of multi-stimuli-responses

“…S1, ESI†) between all the monomers and the representative anti-magnetic Poly(NVK- co -1- co -[4-VB-PI-DMBA]) (200 : 1[ 1 / 4-VB-PI-DMBA = 7 : 1]) were recorded for comparison. Besides the combined and significantly broadened ( δ = 9.38–0.50 ppm) proton signals of NVK , 1 and 4-VB-PI-DMBA , the vinyl-characteristic proton resonances ( δ = 6.64–6.68, 5.73–5.78 and 5.19–5.23 ppm) disappear and are replaced by new up-shifted –CH ( δ = 2.31 ppm) and –CH 2 ( δ = 1.45 ppm) ones 28 for Poly(NVK- co -1- co -[4-VB-PI-DMBA]) . Due to the critical overlapping of the proton signals, the actual molar ratio of the Poly(NVK- co -1- co -[4-VB-PI-DMBA]) could not be meaningfully checked by integration analysis.…”

“…On the other hand, in contrast to the so-called Dexter 25 /Förster 26 energy transfer mechanism to light-stimulus white-light, electroluminescent white-light is further governed by carrier recombination. 27 Therefore, arising from the incomplete correlation between light and electricity stimuli, the examples of single-component Ln 3+ -containing metallopolymers capable of simultaneous light/electricity-stimulated white-light are very rare 28 and still in absolute infancy. Nonetheless, from the viewpoint of multiple intelligences, the pursuit of multi-functional stimuli-responses (such as light-/electric-stimulated white-light and some others) should offer a great challenge to single-component Ln 3+ -containing metallopolymers.…”