scholarly journals Structural Geometry Variation of 1,4-Naphthalene-Based Co-Polymers to Tune the Device Performance of PVK-Host-Based OLEDs

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2914
Author(s):  
Qian Liu ◽  
Dhanashree Moghe ◽  
Gopa Sardar ◽  
Sergei Manzhos ◽  
Steven E. Bottle ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Organic Semiconductors ◽  
High Thermal Stability ◽  
Organic Light Emitting Diodes ◽  
Device Performance ◽  
Blue Color ◽  
Structural Geometry ◽  
Light Emitting ◽  
Organic Light ◽  
Coupling Polymerization

Blue-color-emitting organic semiconductors are of significance for organic light-emitting diodes (OLEDs). In this study, through Suzuki coupling polymerization, three 1,4-naphthalene-based copolymers—namely, PNP(1,4)-PT, PNP(1,4)-TF, and PNP(1,4)-ANT—were designed and synthesized. The variation of comonomers, phenothiazine (PT), triphenylamine substituted fluorene (TF), and anthanthrene (ANT), effectively tuned the emitting color and device performance of poly(9-vinyl carbazole) (PVK)-based OLEDs. Especially, the polymer PNP(1,4)-TF, bearing perpendicular aryl side groups, showed a most twisted structural geometry, which enabled an ultra-high thermal stability and a best performance with blue emitting in PVK-host-based OLEDs. Overall, in this work, we demonstrate a promising blue-color-emitting polymer through structural geometry manipulation.

Two Novel Tetrahedrally Silicon-Based Benzimidazole Derivatives: Potentials as Blue Emitters for OLEDs

2011 ◽  
Vol 306-307 ◽  
pp. 206-210
Author(s):  
Qing Yu Ma ◽  
Rui Fang Guan ◽  
Guo Zhong Li
Keyword(s):  
Thermal Stability ◽  
High Thermal Stability ◽  
Organic Light Emitting Diodes ◽  
Benzimidazole Derivatives ◽  
Light Emitting ◽  
H Nmr ◽  
Organic Light ◽  
Blue Emitters ◽  
Silicon Based ◽  
C Nmr

Two novel silicon-centered benzimidazole derivatives, Bis(4-(benzimidazol-1-yl)phenyl) dimethylsilane (1) and Bis(3-(benzimidazol-1-yl)phenyl)dimethylsilane (2) have been synthesized and determined by IR, 1H NMR, 13C NMR and mass spectroscopy. These compounds have high thermal stability and are fluorescent with emission in the region of violet to blue, which could be potentially applied as blue emitters in organic light-emitting diodes (OLEDs) display.

Asymmetrically twisted anthracene derivatives as highly efficient deep-blue emitters for organic light-emitting diodes

2015 ◽  
Vol 3 (38) ◽  
pp. 9942-9947 ◽  
Author(s):  
Chuanyou He ◽  
Haoqing Guo ◽  
Qiming Peng ◽  
Shengzhi Dong ◽  
Feng Li
Keyword(s):  
Molecular Structure ◽  
Thermal Stability ◽  
High Efficiency ◽  
High Thermal Stability ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deep Blue ◽  
Organic Light ◽  
Anthracene Derivatives ◽  
Blue Emitters

Two anthracene derivatives with asymmetrically twisted molecular structure achieved high thermal stability and high-efficiency deep-blue emissions.

Pyridine-Incorporated Dihexylquaterthiophene: A Novel Blue Emitter for Organic Light Emitting Diodes (OLEDs)

2012 ◽  
Vol 65 (9) ◽  
pp. 1244 ◽  
Author(s):  
Prashant Sonar ◽  
Sonsoles Garcia Santamaria ◽  
Ting Ting Lin ◽  
Alan Sellinger ◽  
Henk Bolink
Keyword(s):  
Light Emitting Diodes ◽  
Blue Emission ◽  
Organic Light Emitting Diodes ◽  
High Yield ◽  
Device Performance ◽  
Host Matrix ◽  
Maximum Brightness ◽  
Light Emitting ◽  
Organic Light ◽  
Processing Techniques

The synthesis and characterisation of 2,5-bis(5′-hexyl-[2,2′-bithiophen]-5-yl)pyridine (Th4PY) and its use as a blue emitter in organic light emitting diodes (OLEDs) is reported. Th4PY was synthesised in high yield using a straightforward Suzuki coupling route with commercially available starting materials. As Th4PY is both soluble and has low molecular weight, blue OLEDs were fabricated using both spin-coating and vacuum deposition thin film processing techniques to study the effect of processing on device performance. OLED devices using a spin-coated layer consisting of 4′,4′′-tris(N-carbazolyl)triphenylamine (TCTA) and 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) as a host matrix together with Th4PY as emitter exhibited highly efficient sky-blue emission with a low turn-on voltage of 3 V, a maximum brightness close to 15000 cd m–2 at 8 V, and a maximum luminous efficiency of 7.4 cd A–1 (6.3 lm W–1) with CIE coordinates of x = 0.212, y = 0.320. The device performance characteristics are compared using various matrices and processing techniques. The promising sky-blue OLED performance, solution processability, and ambient stability make Th4PY a promising blue emitter for application in OLEDs.

Effect of Double Hole-Transporting Structure on Color Purity of Blue Organic Light-Emitting Diodes (BOLED)

2013 ◽  
Vol 311 ◽  
pp. 424-429
Author(s):  
Kan Lin Chen ◽  
Chien Jung Huang ◽  
Zong Jin Wu ◽  
Chih Chieh Kang ◽  
Wen Ray Chen ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Organic Light Emitting Diodes ◽  
Blue Color ◽  
Color Purity ◽  
Television System ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Hole Transporting ◽  
The Right

A blue organic light-emitting diode (OLED) with a double hole-transporting (DHT) structure has been developed. The blue color purity was improved by modulation the thickness of CBP layer. When the thicknesses of left CBP and right CBP are respectively 8 nm and 2 nm, the more pure blue coordinates are (0.155, 0.079), which are very close to the blue coordinates of the national television system committee (NTSC) standard (0.14, 0.08). Furthermore the current density, brightness and the luminous efficiency of device with the left CBP of 8 nm and the right CBP of 2 nm are respectively 144.7 mA/cm2, 1065 cd/m2 and 0.93 cd/A.

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