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Light emitting device, and lighting device and image display unit using it

A light-emitting device and light-emitting element technology, which is applied in the field of lighting devices, image display devices, and light-emitting devices, can solve problems such as insufficient luminous intensity, and achieve the effect of high luminous intensity

Inactive Publication Date: 2007-03-21
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite the high efficiency of Eu 3+ The intensity of the luminescence generated by the absorption of the ligands in the β-diketone complex is the same as that from the Eu 3+ The luminous intensity of the 465nm excitation of the f-f transition is usually significantly higher than that of the Eu 3+ The maximum emission intensity obtained in the / β-diketone complex is only about twice that of the luminescence intensity excited at 465nm
Therefore, when considering the balance of blue and green phosphors, the luminous intensity is insufficient

Method used

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  • Light emitting device, and lighting device and image display unit using it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Eu(TTA) 3 (TPPO) 2 Synthesis

[0099] Dissolve 0.67g (3.0mmol) of 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (H-TTA), 0.56g (2.0 mmol) of triphenylphosphine oxide (TPPO) and 0.32 g (3.0 mmol) of 2,2'-iminodiethanol. Utilize 2 hours at room temperature to this solution, add dropwise to this solution by dissolving the mixed solvent of 0.37g (1mmol) of europium(III) chloride hexahydrate in 20ml of water / isopropanol (1 / 4) The resulting solution was stirred continuously at room temperature for 1 hour. The resulting precipitate was suction filtered and washed with water and isopropanol. The obtained light yellow powder was dried in vacuum at 50°C to obtain the target product Eu(TTA) represented by the following structural formula 3 (TPPO) 2 . The complex has a melting point of 248°C to 251°C.

[0100]

Embodiment 2

[0102] Eu(TTA) 3 Synthesis of Phen

[0103] Dissolve 6.67g (30mmol) of H-TTA, 1.98g (10mmol) of 1,10-phenanthroline (Phen) monohydrate and 3.16g (30mmol) of 2,2'-iminobis in 500ml of ethanol ethanol. To this solution was added dropwise a solution obtained by dissolving 3.67 g (10 mmol) of europium(III) chloride hexahydrate in 200 ml of ethanol at room temperature over 4 hours, followed by standing at room temperature for several hours . The precipitate formed was then filtered off with suction and washed with ethanol. The obtained pale yellow powder was dried in vacuum at 50° C. to obtain the target product Eu(TTA) represented by the following structural formula 3 Phen.

[0104] Elemental analysis of this complex showed 43.33% C, 2.36% H, and 2.78% N, which is approximately equal to the calculated values ​​of 43.43% C, 2.02% H, and 2.81% N. Also, the melting point of this complex is 242°C to 243°C.

[0105] For the obtained Eu(TTA) 3 Phen complexes were determined by p...

Embodiment 3

[0111] Eu(TTA) 3 Synthesis of IQNO

[0112] In 25 ml of ethanol were dissolved 0.67 g (3 mmol) of H-TTA, 0.15 g (1 mmol) of isoquinoline-N-oxide (IQNO) and 0.32 g (3 mmol) of 2,2'-iminodiethanol. To this solution at room temperature, a solution obtained by dissolving 0.37 g (10 mmol) of europium(III) chloride hexahydrate in 20 ml of ethanol was added dropwise to this solution, then 15 ml of water was added, followed by Keep stirring for several hours. The precipitate obtained was filtered off with suction and washed with water. The obtained light yellow powder was dried in vacuum at 50°C to obtain the target product Eu(TTA) represented by the following structural formula 3 IQNO. The complex has a melting point of 249° to 251°C.

[0113]

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Abstract

A light emitting device having a high, stable light emission intensity, that is, a light emitting device in which, when an LED or LD having a emission peak of 380 nm-410 nm is used as the exciting light source of a light emitting device, the light emission intensity of a red phosphor does not change significantly and its luminance as well as its balance when mixed with blue and green phosphors is kept satisfactorily despite some deviation in its emission wavelength. The light emitting device is characterized by comprising a phosphor having Eu<3+> as an emission center ion, a minimum emission intensity, within an excitation wavelength range of 380 nm-410 nm in an excitation spectrum, of at least 65% of a maximum emission intensity, and an emission efficiency at 400 nm of at least 20%, and a semiconductor light emitting element that emits light in a near-UV ray through visible light region.

Description

technical field [0001] The present application relates to a light-emitting device, a lighting device and an image display device, and in particular to a light-emitting device that combines a semiconductor light-emitting element with a red phosphor (phosphor), a lighting device using the light-emitting device, and an image display device . Background technique [0002] Heretofore, light-emitting devices in which light from a discharge lamp or a semiconductor light-emitting device is color-converted with a phosphor have been used in lighting devices and display devices. These light emitting devices emit white light or light of any color by mixing blue, green, and red phosphors, and various studies have recently been conducted in pursuit of high color reproducibility or color reproduction. Most importantly, light emitting devices using semiconductor light emitting elements such as light emitting diodes (LEDs) or laser diodes (LDs) have high luminous efficiency and do not conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06H01L33/00H01L33/50H05B33/14H10K99/00
CPCC09K2211/1011C09K2211/1029C09K2211/1092H01L33/44H01L33/507C09K2211/1007C09K11/06C09K2211/1088H01L33/502H01L51/0089H05B33/14C09K2211/1014C09K2211/182H01L2224/48091H01L2224/48247H01L2224/48257H10K85/351H01L2924/00014
Inventor 矢部晃子村山彻郎
Owner MITSUBISHI CHEM CORP
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