German Development in the light efficiency of 124lm W whitened OLED, greater compared to fluorescent

The introduction of highly efficient whitened OLED. Photo by Frank Erler (photocase) and Nico Seidler (IAPP) to supply

Dresden, Germany (Dresden) research institutions Institute for Applied Photophysics (IAPP), using whitened light giving off OLED device to attain a luminous efficiency of 124lm / W. Related papers released in academic journals “Character” on. 124lm / W in luminous efficiency much greater than regular fluorescent lamps.

Producing OLED products area 6.7mm2. Light is removed from the foot of the glass floor light (Bottom Emission) type. IAPP by frequently altering the fabric thickness, made from the OLED components. Included in this, light the best components are stacked within the glass floor around the hole transport layer and electron obstructing layer created, the previous with the addition of 4mol% NDP-2 from the 45nm thick MeO-TPD layer, the second using 10nm thick NPB.

TCTA through the p-type light-giving off layer and n-type TPBi composition. Have to include the sunshine-giving off layer FIrpic, Ir (ppy) 3 and Ir (MDQ) 2 (acac). These phosphorescent materials can be used for giving of blue, eco-friendly and red-colored.

Additionally, light-giving off layer stack continues to be an opening obstructing layer and electron transport layer, the previous using 10nm thick TPBi, which added Cs while using 205nm thick Bphen. Electrode (cathode, Cathode) through the silver (Ag) formation, the thickness of 100nm.

The overall points of component development is split into three. (1) to optimize the electron transport layer thickness (2) think about the light-giving off layer, bottom, and lightweight extraction layer echoing index matching (3) try a number of shapes from the light extraction layer.

IAPP the electron transport layer must achieve a particular thickness. This is because the thickness of under 200nm, the Ag electrode around the electrode surface, the top plasma (Plasmon) will end up large, resulting in loss increases. Once the thickness is more than 200nm, using the thickness, luminous efficiency can change periodically. Producing components within the IAPP, the electron transport layer thickness of 205nm light the best components.

Echoing index matching, the glass floor and also the same light extraction in the glass echoing index layer are elevated to values greater than 1.78. Echoing index of sunshine-giving off layer material 1.7 ~ 1.9, IAPP this way, in the light-giving off layer towards the light extraction layer, the echoing index is nearly no difference.

The make an effort to shape the sunshine extraction layer, including flat, hemispherical and the rise in the skinny plate convex cone-formed micro-lens array, etc.. Included in this, using hemispherical, the luminous efficiency as much as 124lm / W (brightness 1000cd/m2). Exterior quantum efficiency of 46%.

Hemisphere is indicated by total reflection of sunshine happens inside the easy, so great light extraction performance, but there’s excessive weight boosts the device area problems. Therefore, the Institute has tried to form microlens arrays, discovered that brightness 1000cd/m2, the luminous efficiency of 90lm / W, exterior quantum efficiency of 34%. “This value also greater compared to average luminous efficiency of fluorescent lamps” (the paper). The sunshine extraction layer within the situation from the regular plate glass, brightness 1000cd/m2, the luminous efficiency to around 38lm / W.

IAPP further testing of high brightness light-giving off efficiency. Brightness 5000cd/m2, the luminous efficiency 74lm / W. However, the paper didn’t specify the form of sunshine extraction layer.

The paper stated the existing problem is the fact that shorter existence blue phosphorescent materials, and the necessity to considerably reduce manufacturing costs.

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