Efficient "Pure" blue OLEDs employing tetradentate Pt complexes with a narrow spectral bandwidth

Tyler Fleetham, Guijie Li, Lele Wen, Jian Li

Research output: Contribution to journalArticle

130 Citations (Scopus)

Abstract

A series of efficient 'pure' blue emitters with Commission Internationale de L'Eclairage (CIEy) values less than 0.1 were developed utilizing rigid tetradentate platinum (Pt) complexes. These emitters demonstrated dramatically reduced vibronic sidebands compared with their Pt and Ir analogs resulting in FWHM values of ca. 20 nm for peak emission between 440-450 nm. All the materials used in the devices were purified via train sublimation in a four-zone thermal-gradient furnace under high vacuum. Prior to deposition, the pre patterned ITO-coated glass substrates were cleaned by subsequent sonication in deionized water, acetone, and isopropyl alcohol. The relationship between the efficiencies in a device setting and the small triplet energy differences between the narrow band emitters suggests that the emission energy of these complexes may be near the limit for being compatible with common carbazole based host materials which tend to be aligned with stable materials for OLEDs with long operational lifetimes. Devices of PtON7-dtb, in particular, demonstrated external quantum efficiencies (EQEs) of 22.7% at 100 cd m-2 peaking at 24.8% and CIE values of (0.148, 0.079) in a cohost structure.

Original languageEnglish (US)
Pages (from-to)7116-7121
Number of pages6
JournalAdvanced Materials
Volume26
Issue number41
DOIs
StatePublished - 2014

Fingerprint

Organic light emitting diodes (OLED)
Platinum
Bandwidth
Sonication
2-Propanol
Deionized water
Sublimation
Acetone
Full width at half maximum
Quantum efficiency
Thermal gradients
Furnaces
Alcohols
Vacuum
Glass
Substrates

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Efficient "Pure" blue OLEDs employing tetradentate Pt complexes with a narrow spectral bandwidth. / Fleetham, Tyler; Li, Guijie; Wen, Lele; Li, Jian.

In: Advanced Materials, Vol. 26, No. 41, 2014, p. 7116-7121.

Research output: Contribution to journalArticle

Fleetham, Tyler ; Li, Guijie ; Wen, Lele ; Li, Jian. / Efficient "Pure" blue OLEDs employing tetradentate Pt complexes with a narrow spectral bandwidth. In: Advanced Materials. 2014 ; Vol. 26, No. 41. pp. 7116-7121.
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