LED light emitting device and backlight module using the LED light emitting device

Abstract

The invention discloses a light emitting diode (LED) luminous device. The LED luminous device comprises a purple-light LED chip, a blue-light LED chip and a fluorescent adhesive, wherein the fluorescent adhesive covers the purple-light LED chip and the blue-light LED chip and comprises nitrogen oxide green fluorescent powder, green fluorescent powder with half-wave width below 40 nanometers, Mn<4+> activated fluoride red fluorescent powder and silica gel, and the mass percent of the weight of the nitrogen oxide green fluorescent powder in the total weight of the nitrogen oxide green fluorescent powder, the green fluorescent powder with half-wave width below 40 nanometers and the Mn<4+> activated fluoride red fluorescent powder is less than or equal to 25%. The invention also discloses a backlight module employing the LED luminous device. By the LED luminous device, high color gamut can be acquired, mass production also can be achieved, and the reliability is high. When the LED luminous is applied to the backlight module, a fabricated LED television is approximate to a quantum dot (QD) television in national television system committee (NTSC) gamut, and audience acquires favorable visual experience.

Description

technical field [0001] The invention belongs to the technical field of light-emitting diodes (LEDs), and in particular relates to an LED light-emitting device and a backlight module using the LED light-emitting device. Background technique [0002] The color performance can be quantitatively measured by the NTSC color gamut. The higher the NTSC color gamut, the richer the color. The NTSC color gamut of ordinary LED TVs is only 72%, while the NTSC color gamut coverage of quantum dot (QD) TVs is as high as 110%. Therefore, in recent years, under the trend of TVs with high color performance being popular, quantum dot TVs are widely sold. [0003] However, most quantum dots (QDs) contain heavy metal cadmium (Cd), which is strictly prohibited in the European Union, and quantum dots (QDs) themselves have poor moisture and oxygen resistance. For traditional LED red / green phosphors, its NTSC color gamut is 20% lower than that of quantum dots (QD), which is difficult to meet the ne...

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Problems solved by technology

[0003] However, most quantum dots (QDs) contain heavy metal cadmium (Cd), which is strictly prohibited in the EU, and quantum dots (QDs) themselves have poor moisture and oxygen resistance.

For traditional LED red / green phosphors, its NTSC color gamut is 20% lower than that of quantum dots (QD), which is difficult to meet the needs of the high-end market

In recent years, the NTSC color gamut obtained by using narrow half-wave width red phosphors combined with traditional LED green phosphors has been greatly improved, but it is still about 10% lower than that of quantum dots (QDs), that is, it is difficult to get close to QDs. Achieved NTSC color gamut

[0004] In addition, a new type of green phosphor with a narrow half-wave width (usually below 40nm) excited by violet light is used in LED packaging, and its NTSC color gamut is close to that of QD, but the narrow half-wave The development of wide new green phosphors is progressing slowly, and the blue light excitation efficiency is low, resulting in a large amount of powder used, making the proportion of phosphors exceed that of silica gel, resulting in the inability to achieve mass production

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