Synthesis and Characterization of 8-hydroxyquinoline Complexes of Tin(IV) and Their Application in Organic Light Emitting Diode

A series of 8-hydroxyquinoline complexes of tin, Q(2)SnCl(2) (Q?=?2-methyl-8-hydroxyquinoline, 8-hydroxyquinoline, 5,7-dibromo-8-hydroxyquinoline, 5-chloro-8-hydroxyquinoline, 5,7-dichloro-8-hydroxyquinoline and 5-nitro-8-hydroxyquinoline) were prepared by reacting stannous dichloride with 8-hydroxyquinoline and its derivatives. All complexes were characterized by elemental analysis, mass spectrometry and infrared, UV-vis and (1)H NMR spectroscopes. Furthermore, the molecular structure of a representative complex, dichlorido-bis(5-nitro-quinolin-8-olato-2N,O)tin(IV), was determined by single-crystal X-ray diffraction. The photoluminescence (PL) properties of all prepared compounds and electroluminescence (EL) property of a selected complex (Q?=?5-chloro-8-hydroxyquinoline) were investigated. The results showed that the emission wavelength can be tuned by electron donating or withdrawing group substituent on 8-hydroxyquinoline. Application of prepared complexes in fabrication of an OLED has been demonstrated.     

White-light-emitting devices based on Nile Red and π electron rich [Zn<Subscript>4core</Subscript>] complex

A white organic light-emitting device was fabricated with a structure of ITO/PEDOT: PSS (45 nm)/PVK: Nile Red: [Zn_4core] (75 nm)/BCP (25 nm)/Al. Without Nile Red green and with Nile Red white emission was achieved. When the concentration of the Nile Red in thin film increased from 0.01 to 0.5 wt%, a white emission achieved. The electroluminescence spectra of the device cover a wide range of visible region with two peaks around 501 and 618 nm. It is noteworthy that a white and pure white OLEDs with an incomplete energy transfer from the green host [Zn_4core] to the dopant (Nile Red) was obtained in this work using a single emissive layer relative to the multi layered light emitter ones in white OLED devices. For 0.1 doped device, a maximum luminance efficiency of 2.54 cd/A with CIE coordinates of (x, y = 0.35, 0.37) at 230 mA/cm² has was achieved.     

Color optimization of red OLEDs via periodic and gradient deposition rate of fluorescent dopants

Optical and Quantum Electronics - This paper deals with the 700&nbsp;keV energetic Carbon (C) ions irradiations induced structrual&nbsp;modification and optical bandgap tunning&nbsp;of...     

Red organic light emitting device based on TPP and a new host material

A novel coating method for fabrication of red OLEDs by using a new host material has been developed with the aid of a single furnace. The host material, zinc complex, was prepared from the reaction of zinc acetate and 2-methyl-8-hydroxyquinoline and after characterization by UV-vis, FT-IR, and ¹H NMR spectroscopes was used as an emitting material in the fabrication of OLEDs. Since meso-tetraphenylporphyrin (TPP) and zinc complex have a close molecular weight, both materials were evaporated from a single furnace. Devices with TPP and structures of ITO/PEDOT:PSS (55 nm)/PVK (90 nm)/zinc complex:TPP (65 nm)/Al (180 nm) were fabricated; Without TPP green and with TPP red emission was achieved. The device with 2 % TPP that doped into the zinc complex showed the purest red emission among all devices. The device showed the CIE coordinates of 0.70 and 0.28 at 14 V and a maximum luminance of about 94.2 cd/m². This new method is a promising candidate for fabrication of low cost red OLEDs with a more homogeneous layer.