White light electrogenerated light-emitting apparatus

An electroluminescent device and electroluminescent technology, applied in the direction of electro-solid devices, luminescent materials, electrical components, etc., can solve the problems of restricting blue light emission, rising device temperature, poor life and stability, etc., so as to improve the luminescence The effect of efficiency

Inactive Publication Date: 2012-08-29
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Luminescent materials are the most important factor affecting luminous efficiency. Luminescent materials can be divided into fluorescent materials and phosphorescent materials. Fluorescent materials are blocked by triplet transitions, so they can only emit light through radiation inactivation of singlet states. Triplet excitons and The ratio of singlet excitons is about 3:1; since only 25% of the excitons in the fluorescent material can be effectively used, the remaining 75% are attenuated by non-radiation, and the energy is released in the form of heat, which increases the temperature

Method used

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  • White light electrogenerated light-emitting apparatus
  • White light electrogenerated light-emitting apparatus

Examples

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Example Embodiment

[0037] Example 1

[0038] A white light-emitting device, its structure is: glass / ITO / MoO 3 / NPB / TCTA / Bepp 2 :Ir(MDQ) 2 (acac) / TCTA / TBADN:BCzVBi / TCTA / Bepp 2 :Ir(ppy) 3 / TPBi / Bphen / Bphen:CsN 3 / Al.

[0039] Regarding the white electroluminescent device in this embodiment, according to its structure, and using vapor deposition technology, each organic functional layer is prepared by vapor deposition in sequence; among them, the composite structure of the light emitting layer: the red light of the red phosphorescent light emitting layer Material is Ir (MDQ) 2 (acac), the doped body is Bepp 2 , The red light material doping ratio is 0.5%, the thickness is 7nm; the material of the first spacer layer is TCTA, the thickness is 2nm; the blue light material of the blue phosphor layer is BCzVBi, the main body is TBADN, and the blue material doping ratio is 10%, The thickness is 10nm; the material of the second spacer layer is TCTA, the thickness is 2nm; the green material of the green phospho...

Example Embodiment

[0046] Example 2

[0047] A white electroluminescent device, the structure of which is: glass / ITO / WO 3 / TPD / TCTA / BeBq 2 :Ir(piq) 2 (acac) / TPD / TPD:BCzVB / TPD / BeBq 2 :Ir(ppy)2(acac) / TAZ / TPBI / Cs 2 CO 3 / Al.

[0048] Regarding the white electroluminescent device in this embodiment, according to its structure, and using vapor deposition technology, each organic functional layer is prepared by vapor deposition in sequence; among them, the composite structure of the light emitting layer: the red light of the red phosphorescent light emitting layer Material is Ir(piq) 2 (acac), the doped body is BeBq 2 , The red light material doping ratio is 5%, and the thickness is 5nm; the material of the first spacer layer is TPD with a thickness of 10nm; the blue light material of the blue phosphor layer is BCzVB, the main body is TPD, and the blue material doping ratio is 20%, The thickness is 20nm; the material of the second spacer layer is TPD, and the thickness is 10nm; the green material of the g...

Example Embodiment

[0049] Example 3

[0050] A white photoluminescence device, the structure of which is: glass / ITO / VO x / TDAPB / NPB / BeqQ 2 :Ir(piq) 3 / NPB / TCTA:TBPe / TDAPB / BeMQ 2 :Ir(ppy) 3 / BND / TPQ / LiF / Al.

[0051] Regarding the white electroluminescent device in this embodiment, according to its structure, and using vapor deposition technology, each organic functional layer is prepared by vapor deposition in sequence; among them, the composite structure of the light emitting layer: the red light of the red phosphorescent light emitting layer Material is Ir(piq) 2 (acac), the doped body is BeqQ 2 , The red light material doping ratio is 4%, the thickness is 15nm; the material of the first spacer layer is NPB, the thickness is 1nm; the blue light material of the blue fluorescent layer is TBPe, the main body is TCTA, the blue material doping ratio is 15%, and the thickness 15nm; the material of the second spacer layer is TDAPB with a thickness of 1nm; the green material of the green phosphorescent laye...

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Abstract

The invention discloses a white light electrogenerated light-emitting apparatus, which comprises the structure including a substrate, a conductive layer, a hole injecting layer, a hole transmitting layer, an electron stop layer, a light emitting layer, a hole stop layer, an electron transmitting layer, an electron injecting layer and a cathode layer in sequence; the light emitting layer is a composite layer structure, and the composite layer structure comprises the following layers of a red phosphor light emitting layer, a first interval layer, a blue light emitting layer, a second interval layer and a green phosphor light emitting layer in sequence; and the red phosphor light emitting layer is prepared on the surface of the electron stop layer, and the hole stop layer is prepared on the surface of the green phosphor light emitting layer. According to the invention, light emitting layers of blue light emitting materials, red and green light phosphor materials are applied in the white light electrogenerated light-emitting apparatus, red and green light phosphor light emitting layers are respectively arranged on both sides of the blue light emitting layer, therefore the triplet state energy of blue light can be fully captured, and the light emitting efficiency is further increased.

Description

technical field [0001] The invention relates to a white light electroluminescent device. Background technique [0002] In 1987, C.W.Tang and Van Slyke of Eastman Kodak Company in the United States reported a breakthrough in the research of organic electroluminescence. A high-brightness, high-efficiency double-layer organic electroluminescent device (OLED) was prepared by using ultra-thin film technology. In this double-layer structure device, the brightness reaches 1000cd / m at 10V 2 , its luminous efficiency is 1.51lm / W, and its lifespan is more than 100 hours. [0003] The principle of OLED light emission is based on the action of an external electric field, electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter, and holes are injected from the anode to the highest occupied orbital (HOMO) of organic matter. Electrons and holes meet, recombine, and form excitons in the light-emitting layer. Excitons migrate under the ac...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54C09K11/06
CPCY02B20/00
Inventor 周明杰王平黄辉陈吉星
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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