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Preparation of blue-light-excitable orange-red cationic iridium(Ⅲ) complexes for LEDs

A cationic, blue light-excited technology, which is applied to indium organic compounds, platinum group organic compounds, compounds containing elements of group 8/9/10/18 of the periodic table, etc., can solve the problem of lack of red light components and color rendering in white light LEDs Problems such as low index and high color temperature

Inactive Publication Date: 2020-05-12
YUNNAN MINZU UNIV
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Problems solved by technology

[0002] At present, commercial white LEDs on the market mainly use GaN blue light chips to excite the yellow light material Y 3 Al 5 o 12 : Ce 3+ (YAG:Ce), because the emission range of YAG:Ce is in the yellow-green light region, the obtained white light LED has a low color rendering index and a high color temperature due to the lack of red light components, which belongs to cool white light

Method used

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  • Preparation of blue-light-excitable orange-red cationic iridium(Ⅲ) complexes for LEDs
  • Preparation of blue-light-excitable orange-red cationic iridium(Ⅲ) complexes for LEDs
  • Preparation of blue-light-excitable orange-red cationic iridium(Ⅲ) complexes for LEDs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) 2-(9-Ethyl-9 H Preparation of -carbazol-3-yl)-2-formylglyoxal (compound 1):

[0022] Take SeO 2 (4.68 g, 42 mmol) in a 500 mL round bottom flask, add 30 mL of dioxane and 3 mL of water, and heat to 100 °C under vigorous stirring until SeO 2 Dissolve completely, weigh 3-acetyl-N-ethylcarbazole (2 g, 8.4 mmol) into the solution, stir vigorously and reflux, after the reaction is completed, filter the mixture with a Buchner funnel, and the obtained filtrate is rotated The solvent was removed by an evaporator to obtain a crude product, which was separated and purified by silica gel column chromatography with petroleum ether as eluent to obtain a yellow solid powder with a yield of 86.3 % (1.83 g). 1 H NMR (400 MHz, CDCl 3 , ppm), δ: 9.79 (s, 1H, –CHO), 8.99 (s, 1H, Ar–H), 8.30 (d, 1H, Ar–H), 8.17 (d, 1H, Ar–H), 8.15 (d,1H, Ar–H), 7.53 (t, 1H, Ar–H), 7.45 (t, 1H, Ar–H), 7.33 (d, 1H, Ar–H), 4.38(q, 2H, – CH 2 –), 1.45 (t, 3H, –CH 3 ).

[0023] (2) Preparation of py...

Embodiment 2

[0039] Preparation of monochromatic red LED:

[0040] Weigh the silica gel and iridium(III) complexes according to the mass percentage concentration of iridium(III) complexes: 0.5 wt.%, 1.0 wt.%, 1.5 wt.%, 2.0 wt.%, 2.5 wt.%, 3.0 wt.% After fully mixing, it was evenly coated into the groove of the GaN blue light chip, placed in an oven, heated at 150 °C for 1 h, dried and cured, and tested at a current of 20 mA to obtain the relevant data shown in Table 1 below.

[0041] Table 1: Performance test data of LEDs prepared only with iridium (III) complex orange-red light-emitting materials

[0042]

[0043] as above and Image 6 As shown, when the doping amount reaches 3.0 wt.%, the iridium (III) complex can completely absorb the blue light emitted by the GaN blue light chip, and with the increase of the doping amount, the color rendering index of the fabricated LED device is improved. Significantly improved, and the color temperature dropped significantly.

Embodiment 3

[0045] Preparation of iridium(Ⅲ) complex orange-red luminescent material and YAG:Ce yellow luminescent material mixed doping LED:

[0046] According to the mass fraction of YAG:Ce yellow luminescent material, x wt.% = 4.0 wt.%, and the mass fractions of iridium(Ⅲ) complexes are x wt.% = 0.5 wt.%, 1.0 wt.%, 1.5 wt.%, 2.0 wt.%, 2.5 wt.% Weigh out YAG:Ce, iridium(III) complex and silica gel after fully mixing, and then apply uniformly. It was placed in the groove of the GaN blue light chip, placed in an oven, heated at 150 °C for 1 h, dried and cured, and tested at a current of 20 mA to obtain the relevant data shown in Table 2 below.

[0047] Table 2: The performance test data of the mixed doping LED of iridium (III) complex orange-red light-emitting material and YAG:Ce yellow light-emitting material.

[0048]

[0049] as above and Figure 7 When the doping amount of iridium(III) complex reaches 0.5 wt.%, the color temperature is 5461 K, which is close to neutral white l...

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Abstract

The invention relates to a novel orange-red luminescent material, namely a cationic iridium (III) complex, which can be excited by blue light and can be used for preparing a warm white light emittingdiode (LED). The material can be mixed and doped with Y3Al5O12:Ce<3+>(YAG:Ce) yellow fluorescent powder for encapsulation, and GaN blue light chip (lambda em, max is equal to 455nm) is used for exciting to obtain warm white light; the specific content relates to synthesis of a cationic organic iridium (III) complex and preparation of a device, finally, the warm white LED with excellent luminous efficiency and good color temperature is obtained. By taking the GaN blue light chip as an excitation light source, the LED gradually changes from cold white light to warm white light with the increaseof the content of the orange-red luminescent material. Compared with an LED device prepared by only using YAG:Ce as the luminescent material, the LED device prepared by mixing and doping the YAG:Ce with the orange-red luminescent material, disclosed by the invention, has the advantage that the color temperature can be significantly reduced. The red-orange luminescent material has the advantages ofgood chemical and thermal stability, high luminous efficiency, easiness in synthesis and purification, low price, simple operation when being applied to the LED and better application prospect.

Description

technical field [0001] The invention relates to a novel cationic organic iridium (Ⅲ) complex orange-red luminescent material that can be excited by blue light and used to prepare warm white light-emitting diodes (LEDs). The material can be produced by GaN blue light chips (λ em ,max = 455 nm) excitation, specifically related to the synthesis of cationic organic iridium (Ⅲ) complexes and the preparation of devices. Background technique [0002] At present, commercial white LEDs on the market mainly use GaN blue light chips to excite the yellow light material Y 3 Al 5 o 12 : Ce 3+ (YAG:Ce), because the emission range of YAG:Ce is in the yellow-green light region, the obtained white LED has a low color rendering index and a high color temperature due to the lack of red light components, which belongs to cool white light. [0003] At present, there are two ways to improve this problem: (1) modify YAG:Ce, mainly by adding some metal ions that are good for red light emission (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F15/00C09K11/06H01L33/50
CPCC07F15/0033C09K11/06C09K2211/185H01L33/502
Inventor 唐怀军叶艳春陈泽宇孟国云陈明先孙日勇王凯明
Owner YUNNAN MINZU UNIV
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