A single component white electroluminescent device fabricated from a metallo-organic terbium complex. Issue 44 (31st October 2019)

• Record Type: Journal Article
• Authors: Ilmi, Rashid; Khan, Muhammad S.; Sun, Weidong; Zhou, Liang; Wong, Wai-Yeung; Raithby, Paul R.
• Is Part Of: Journal of materials chemistry. Volume 7:Issue 44(2019)
• Page Start: 13966
• Page End: 13975
• Publication Date: 2019-10-31
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc04653d
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A metallo-organic terbium(iii ) complex has been used to fabricate an efficient single-layer white electroluminescent device. Abstract : Two new mixed ligand complexes [Eu(tfac)3 (DPEPO)] (Eu-1 ) and [Tb(tfac)3 (DPEPO)] (Tb-2 ) incorporating trifluoroacetylacetone (Htfac) and bis(2-(diphenylphosphino)phenyl)ether oxide (DPEPO) were synthesized in gram-scale quantities and used as emitters to fabricate single- and double-EML (light-emitting layer) electroluminescence (EL) devices. The single-EML device with the structure: ITO/HAT-CN (6 nm)/HAT-CN (0.2 wt%):TAPC (50 nm)/Eu-1 (1–6 wt%): 26DCzPPy (10 nm)/Tm3PyP26PyB (50 nm)/LiF (1 nm)/Al (100 nm) showed light red (CIE, x : 0.574; y : 0.275) emission for the Eu-1 based EL devices due to the presence of a host emission with a brightness of 1274 cd m −2, current efficiency ( η c ), power efficiency ( η p ) and external quantum efficiency (EQE) of 0.58 cd A −1, 0.68 lm W −1, and 0.70%, respectively. The single-EML device for the Tb-2 complex with the same device structure displayed white-light emission. The optimized single-EML device of Tb-2 with 14.0 wt% doping concentration showed an impressive EL performance with brightness of 1637 cd m −2, η c ≈ 3.05 cd A −1, η p ≈ 2.80 lm W −1, EQE ≈ 1.4%, V turn-on ≈ 3.1 V, respectively. This is the first report of single component white organic light emitting diode (W-OLED) fabricated from an organo-Tb(iii ) complex. The W-OLEDs show low turn-on voltages ( V turn-on ) ≈ 3.1 V and are thus advantageous in lowering the power consumption of the OLED display.