Optimization of HIL-HTL-free naphthalimide: Isoquinoline TEOLEDs with BZO top electrode

FİAT VAROL S., Sayin S., MERDAN Z.

Solid-State Electronics, vol.209, 2023 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 209
  • Publication Date: 2023
  • Doi Number: 10.1016/j.sse.2023.108755
  • Journal Name: Solid-State Electronics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC
  • Keywords: Top emitting organic light emitting diode (TEOLED), Naphthalimide, Electroluminescence, Aggregation induced emission enhancement (AIEE)
  • Manisa Celal Bayar University Affiliated: Yes

Abstract

The present work focuses mainly on HIL/HTL-free TEOLEDs with furan-appended naphthalimide: isoquinoline (furan IQ) and morpholine-appended naphthalimide: isoquinoline (morpholine IQ), which were synthesized from the reaction between naphthalic anhydride and a substituent such as 2-furoic hydrazide or 4-aminomorpholine. Both of the emitters displayed aggregation-induced emission enhancement (AIEE) behavior. This new structure was constructed between modified indium tin oxide (ITO) with caesium fluoride (CsF) (5.18 eV) and boron-doped zinc oxide (BZO) (3.20 eV) with ideal work functions. The current densities were 400 mA.cm−2 and 387 mA.cm−2 and luminances were in the range of 9500 cd.m−2 9000 cd.m−2 for the furan IQ and morpholine IQ emitters, respectively. We have introduced a new CsF-ITO/EML/LiF/BZO design with external quantum efficiencies (EQEs) of 9.50 % and 7.57%. We have achieved a standard deep violet/blue CIE coordinates of (0.15, 0.06) and (0.16, 0.05) for furan IQ and morpholine IQ emitters with a high color stability.