Multi emissive layer type white organic light emitting diode based on zinc metal complexes

2012 ◽  
Author(s):  
Amit Kumar ◽  
Ritu Srivastava ◽  
Arunandan Kumar ◽  
Modeeparampil N. Kamalasanan ◽  
Ishwar Singh
Keyword(s):  
Metal Complexes ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light Emitting Diode ◽  
Zinc Metal ◽  
Organic Light

scholarly journals Organic Light-Emitting Diode with Color Tunable between Bluish-White Daylight and Orange-White Dusk Hue

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Shih-Yun Liao ◽  
Sudhir Kumar ◽  
Hui-Huan Yu ◽  
Chih-Chia An ◽  
Ya-Chi Wang ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Light Emitting Diode ◽  
Cost Effective ◽  
Color Temperature ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Color Tunable ◽  
Living Organisms

The varying color of sunlight diurnally exhibits an important effect on circadian rhythm of living organisms. The bluish-white daylight that is suitable for work shows a color temperature as high as 9,000 K, while the homey orange-white dusk hue is as low as 2,000 K. We demonstrate in this report the feasibility of using organic light-emitting diode (OLED) technology to fabricate sunlight-style illumination with a very wide color temperature range. The color temperature can be tuned from 2,300 K to 9,300 K, for example, by changing the applied voltage from 3 to 11 V for the device composing red and yellow emitters in the first emissive layer and blue emitter in the second. Unlike the prior arts, the color-temperature span can be made much wider without any additional carrier modulation layer, which should enable a more cost effective fabrication. For example, the color-temperature span is 7,000 K for the above case, while it is 1,700 K upon the incorporation of a nanoscale hole modulation layer in between the two emissive layers. The reason why the present device can effectively regulate the shifting of recombination zone is because the first emissive layer itself possesses an effective hole modulation barrier of 0.2 eV. This also explains why the incorporation of an extra hole modulation layer with a 0.7 eV barrier did not help extend the desirable color-temperature span since excessive holes may be blocked.

High efficiency green phosphorescent top-emitting organic light-emitting diode with ultrathin non-doped emissive layer

2014 ◽  
Vol 15 (10) ◽  
pp. 2408-2413 ◽  
Author(s):  
Xindong Shi ◽  
Jun Liu ◽  
Jing Wang ◽  
Xinkai Wu ◽  
Youxuan Zheng ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light Emitting Diode ◽  
Organic Light

Annealing Effect on Small Molecules Blend Organic Light-Emitting Diodes

2013 ◽  
Vol 795 ◽  
pp. 110-114 ◽  
Author(s):  
Mohd Arif Mohd Sarjidan ◽  
Siti Hajar Basri ◽  
W.H. Abd Majid
Keyword(s):  
Light Emitting Diode ◽  
Research Work ◽  
Annealing Process ◽  
Organic Light Emitting Diodes ◽  
Ternary Blend ◽  
Light Emitting ◽  
Emissive Layer ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Coating Method

This research work investigates the influence of the annealing process upon the performance of photo-emissive layer of organic light-emitting diode (OLED). The photo-emissive layer consists of a ternary blend of N, N-diphenyl-N,N-bis (3-methylphenyl)-(1,1-biphenyl)-4,4-diamine (TPD), 2-(4-biphenylyl)-5-phenyl-1,3,4-oxadiazole (PBD) and tris-8-hydroxyquinoline (Alq3), to produce TPD:PBD:Alq3 (at 1:1:1 ratio) blend thin films, in which the material solutions are deposited onto clean substrate via spin-coating method. The samples were annealed at 100°C in 10, 20 and 30 minute of time in an open-air condition. The results reveal that the annealing process at 10 minutes produces an optimum performance of the ternary OLED.

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