Zn2Yb-Grafted and star-shaped metallopolymers for efficient near-infrared (NIR) polymer light-emitting diodes (PLEDs). Issue 33 (10th August 2018)

• Record Type: Journal Article
• Authors: Fu, Guorui; He, Yani; Li, Baoning; Liu, Lin; Li, Wentao; Zhang, Zhao; Lü, Xingqiang
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 33(2018)
• Page Start: 8950
• Page End: 8957
• Publication Date: 2018-08-10
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8tc02776e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The charge-facilitated and BCP-assisted carrier balance of Zn2 Yb-grafted and star-shaped metallopolymerpoly(3- co -NBE) was used to prepare a Yb 3+ -centered NIR-PLED that exhibited record electroluminescent performance (irradiance, 90.24 μW cm −2 ; EQE, 0.065%; V on, 5 V; and weak efficiency roll-off). Abstract : Ring-opening metathesis polymerization (ROMP) of tetraallyl-functionalized complex monomer {[Zn2 (L)4 Ln(OAc)2 ]·(NO3 )} (HL = 4-allyl-2-(1 H -benzo[ d ]imidazol-2-yl)-6-methoxyphenol; Ln = Nd, 2 ; Ln = Yb, 3 ; or Ln = Er, 4 ) with NBE (norbornene) was used to prepare Zn2 Ln-containing star-shaped metallopolymers with desirable physical properties, including efficient Ln 3+ -centered NIR luminescence. Using metallopolymerpoly(3- co -NBE), with its charge-facilitated and BCP-assisted carrier transport properties (BCP = 2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline), as the emitting layer in a Yb 3+ -centered NIR-PLED afforded record electroluminescent properties (irradiance, 90.24 μW cm −2 ; efficiency, 0.065%) among previously reported organo-Yb 3+ -doped or organo-Yb 3+ -grafted polymer systems, with the advantages of a low turn-on voltage (5 V) and weak efficiency roll-off (≤30%) compared with organo-Yb 3+ -complex-based NIR-OLEDs.