Synthesis and Properties of a Blue Bipolar Indenofluorene Emitter Based on a D-π-A Design
摘要:
Through a rational design, a novel Donor-Acceptor pi-conjugated (D-pi-A) blue fluorescent indenofluorene dye, DA-DSF-IF, has been synthesized for application In single-layer Small Molecule Organic Light Emitting Diodes (SMOLEDs). This new blue emitter possesses bipolar properties as well as good morphological and emission color stabilities and has been successfully used in a blue emitting single-layer SMOLED, with performances impressively magnified compared to a nonbipolar indenofluorene emitter.
Synthesis and Properties of a Blue Bipolar Indenofluorene Emitter Based on a D-π-A Design
摘要:
Through a rational design, a novel Donor-Acceptor pi-conjugated (D-pi-A) blue fluorescent indenofluorene dye, DA-DSF-IF, has been synthesized for application In single-layer Small Molecule Organic Light Emitting Diodes (SMOLEDs). This new blue emitter possesses bipolar properties as well as good morphological and emission color stabilities and has been successfully used in a blue emitting single-layer SMOLED, with performances impressively magnified compared to a nonbipolar indenofluorene emitter.
tert-Butylated spirofluorene derivatives with arylamine groups for highly efficient blue organic light emitting diodes
作者:Kum Hee Lee、Seul Ong Kim、Jae Nam You、Sunwoo Kang、Jin Yong Lee、Kyoung Soo Yook、Soon Ok Jeon、Jun Yeob Lee、Seung Soo Yoon
DOI:10.1039/c2jm14869b
日期:——
A series of tert-butylated spirofluorene derivatives incorporating a diphenylaminoaryl-vinyl group was synthesized via the Horner–Wadsworth–Emmons olefination and a Suzuki cross-coupling reaction. To examine the electroluminescent properties of these materials, multilayered OLEDs were fabricated into the following device structure: ITO/DNTPD/NPB/MADN:blue dopant materials 1–14/Alq3/Liq/Al. All devices showed efficient blue emission. In particular, one device exhibited highly efficient sky blue emission with a maximum luminance of 25 100 cd m−2 at 8.5 V, as well as luminous, power and external quantum efficiencies of 9.5 cd A−1, 5.1 lm W−1 and 6.7% at 20 mA cm−2, respectively. The peak wavelength of electroluminescence was 458 and 484 nm with CIEx,y coordinates of (0.14, 0.21) at 8.0 V. In addition, a deep blue device with CIEx,y coordinates of (0.15, 0.15) at 8.0 V showed a luminous efficiency and external quantum efficiency of 3.8 cd A−1 and 3.3% at 20 mA cm−2, respectively.
通过 Horner-Wadsworth-Emmons 烯化反应和铃木交叉偶联反应,合成了一系列含有二苯基氨基芳基乙烯基的叔丁基化螺芴衍生物。为了研究这些材料的电致发光特性,将多层有机发光二极管制成了以下器件结构:ITO/DNTPD/NPB/MADN:蓝色掺杂材料 1-14/Alq3/Liq/Al。所有器件都显示出高效的蓝色发射。其中,一个器件显示出高效的天蓝色发射,在 8.5 V 时的最大亮度为 25 100 cd m-2,在 20 mA cm-2 时的发光效率、功率效率和外部量子效率分别为 9.5 cd A-1、5.1 lm W-1 和 6.7%。电致发光的峰值波长为 458 和 484 nm,8.0 V 时的 CIEx,y 坐标为 (0.14, 0.21)。此外,深蓝色器件的 CIEx,y 坐标为 (0.15, 0.15),8.0 V 时的发光效率和外部量子效率分别为 3.8 cd A-1 和 3.3%(20 mA cm-2)。
Novel Materials for Organic Electroluminescent Devices
申请人:Vestweber Horst
公开号:US20080220285A1
公开(公告)日:2008-09-11
The present invention relates to the improvement of organic electroluminescent devices, in particular blue-emitting devices, by using compounds of the formula (1) as dopants in the emitting layer.
本发明涉及利用式(1)化合物作为发光层杂质,改善有机电致发光装置,特别是蓝色发射装置。
Intramolecular excimer emission as a blue light source in fluorescent organic light emitting diodes: a promising molecular design
Intramolecular excimer emission arising from organic molecules as a blue light source in fluorescent Small Molecule Organic Light Emitting Diodes (SMOLEDs) is almost absent from the literature. In this work, three aryl-substituted DiSpiroFluorene–IndenoFluorenes (DSF–IFs 1–3) possessing different fluorescent properties due to their different main emitters have been investigated through a structure–property relationship study. Due to its particular geometry, the rigid DSF–IF platform 2 allows an ‘aryl/fluorene/aryl’ dimer to be preformed in the ground state leading, in the excited state, to a deep blue fluorescent emission through strong π–π intramolecular interactions between the two ‘aryl/fluorene/aryl’ arms. 2 has been successfully used as an emitting layer in a SMOLED with electroluminescence arising from electrogenerated intramolecular excimers and the properties of these excimer-based OLEDs have been compared to those of two model compounds (1 and 3). The simple and non-optimized double-layer device displays a deep blue colour (CIE coordinates: 0.19; 0.18) exhibiting a luminance of 510 Cd m−2 with a luminous efficiency of ca. 0.1 Cd A−1. This work is, to the best of our knowledge, the first rational and comparative study describing an intramolecular excimer based-SMOLED.
Luminescence modulations of a bulky dispiro[fluorene-9,11′-indeno[1,2-b]fluorene-12′,9′′-fluorene] (DSF-IF) core embedded in thermotropic liquid crystal phases.