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Electroluminescent device having a variable color point

A technology of electroluminescent devices and electroluminescent materials, which is applied in the direction of electroluminescent light sources, electric solid devices, organic semiconductor devices, etc., and can solve problems such as expensive electrodes

Active Publication Date: 2010-11-17
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like the complex individual driving of the individual light-emitting regions, this design of the device also requires additional, expensive technology for the production of the structured electrodes and is therefore also undesirable

Method used

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  • Electroluminescent device having a variable color point
  • Electroluminescent device having a variable color point
  • Electroluminescent device having a variable color point

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] The first electrode 2 is used as an anode: ITO, d=120nm

[0061] Hole transport layer 3: α-NPD between the first electrode and the first region, MTDATA doped with 1% F4-TCNQ between the first electrode and the second region, d=80nm for both materials

[0062] First area 41:

[0063] Red-emitting layer: α-NPD doped with 10% ADSO76, d=17nm

[0064] Green light-emitting layer: TCTA doped with 8% Ir(ppy) 3 , d=3nm

[0065] Hole-blocking layer: Balq, d=10nm

[0066] Second area 42:

[0067] Blue light-emitting layer: Idemitsu-Kosan's substrate with blue fluorescent emitter, d=30nm

[0068] Electron transport layer 5: Alq 3 , d=20nm

[0069] Electron injection layer: LiF, d=1nm

[0070] Second electrode 6 as cathode: Al, d=100 nm.

[0071] In the above example, in Figure 4 The hole-transport layer 3 extending over the two regions shown in is of a different material in the area of ​​the first and second region. Apart from Figure 4 In addition to that shown in , o...

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Abstract

An electroluminescent device (9) for emitting light (7) whose color point is able to be set variably, comprising at least two electroluminescent regions (41, 42) that, to allow the same operating voltage to be applied, are arranged to be connected in parallel electrically, wherein the electroluminescent regions (41, 42) comprise - at least one first electroluminescent region (41) of a first electroluminescent material for emitting light in a first spectral band in accordance with a first luminance vs. voltage characteristic (81), and - at least one second electroluminescent region (42) of a second electroluminescent material for emitting light in a second spectral band that is not the same as the first spectral band, in accordance with a second luminance vs. voltage characteristic (82) that is not the same as the first luminance vs. voltage characteristic (81).

Description

technical field [0001] The present invention relates to an electroluminescent device for emitting light with a variable color point, and a method for setting and changing the color point. Background technique [0002] Electroluminescent devices are used in a large number of applications, for example in room lighting systems, signage and signaling systems, backlighting of displays or screens, and many others. They generally comprise an electroluminescent structure (EL structure) in the form of a layer, which is applied to a substrate and has a light-emitting layer which is arranged between two electrodes for applying an operating voltage. When the applied voltage exceeds a minimum value, the electroluminescent device emits light, the spectrum of which depends on the properties of the luminescent material. For some of the applications mentioned above, such as room lighting systems, backlighting of lamps and screens, it is critical to emit white light with a given color point....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L27/15H05B33/14H05B44/00
CPCH01L51/5278H01L2251/5361H01L51/5036H05B33/14H01L27/156H10K50/125H10K50/19
Inventor H·-P·洛布尔V·范埃尔斯伯根E·W·A·扬
Owner KONINK PHILIPS ELECTRONICS NV