A white light LED package structure and a white light source system

Abstract

The invention provides a white light LED packaging structure, comprising: a substrate, an LED chip and a wavelength conversion material layer; it is characterized in that: LED chips with at least two wavelengths, wherein the peak wavelength of the first LED chip is between 385 and 425nm , the peak wavelength of the second chip is longer than the peak wavelength of the first LED chip, the emission spectrum peak wavelength of the wavelength conversion material layer is between 440-700nm, and the wavelength conversion material layer absorbs the light emitted by the LED chip And emit a white light source.

Description

technical field

[0001] The invention relates to the technical field of semiconductors, in particular to a white LED packaging structure and a white light source system. Background technique

[0002] A light-emitting diode (LED for short) is a solid semiconductor light-emitting device. Existing LED lighting devices generally use blue LEDs to excite green, yellow, and red phosphors to obtain mixed white light. However, due to the discontinuity of the white light spectrum, some color rendering indexes are lower than 90. And the white light LED made of the existing blue light chip has obvious blue light hazards (such as figure 1 and 2 Shown), causing widespread debate among the industry and consumers.

[0003] Using violet light chips or near-violet light chips to excite RGB three-color phosphors can realize continuous spectrum and achieve the effect similar to solar spectrum (such as image 3 and 4 shown). However, after changing to a purple light chip, the wavelength dif...

Examples

Embodiment 1

[0045] Such as Figure 5As shown, the present embodiment provides a white LED packaging structure, including: a base material (Base); the LED chip is located on the base material; the wavelength conversion material layer is located on the LED chip; wherein the LED chip is selected from a Violet chip ) and a blue chip (Blue chip), the wavelength of the purple chip is 385~425nm, preferably 410~420nm, the wavelength of the blue chip is 440~460nm, preferably 445~460nm, the wavelength conversion material layer can include wavelength conversion materials of two wavelengths, wherein One kind of wavelength conversion material is excited by the violet LED chip, and the emission spectrum wavelength is between 440 and 600nm. The other wavelength conversion material is excited by the blue light chip chip, and the emission spectrum wavelength is between 500 and 700nm. At 450-700nm, the wavelength conversion material layer absorbs the light emitted by the LED chip to emit white light.

[0...

Embodiment 2

[0053] Such as Figure 7 As shown, the difference from Example 1 is that the G phosphor and the R phosphor of this embodiment are mixed and covered on the blue light chip, while the B phosphor is alone covered on the purple light chip. Specifically, the wavelength of the purple light chip is 410nm~420nm, and the wavelength of the blue light chip is 445nm~460nm. The excitation wavelength of B phosphor is 390nm, which can better absorb violet light and emit blue light with a wavelength of about 460nm. G phosphor can choose Lu 3 al 5 o 12 : Ce 3+ Phosphors: The excitation wavelength is 450nm, LuAG hardly absorbs violet light, and the emission wavelength is about 550nm. R phosphor can choose AEC:Eu 2+ (AE=Ca and Sr) Phosphors, among which AE=Ca has the best effect: the excitation wavelength is around 450nm, and the excitation efficiency is high (higher than 80%). Under the condition of 410nm~420nm, the wavelength intensity is small, and the excitation efficiency Low (less ...

Embodiment 3

[0058] Such as Figure 10 As shown, the difference from Example 1 is that the GY (yellow-green) phosphor and B phosphor of this embodiment are mixed and covered on the purple light chip, while the R phosphor is alone covered on the blue light chip. Specifically, the wavelength of the purple light chip is 410~420nm, and the wavelength of the blue light chip is 445~460nm. The excitation wavelength of B phosphor is 390nm, which can better absorb violet light and emit blue light with a wavelength of about 460nm. GY phosphor can choose Eu-doped alkaline earth silicate Phosphors: the maximum excitation wavelength is 410nm, and the excitation efficiency reaches the highest between emission wavelength 500~600nm. R phosphor can choose AEC:Eu 2+(AE=Ca andSr) Phosphors, among which AE=Ca has the best effect: the excitation wavelength is around 450nm, and under the condition of 410~420nm, the wavelength intensity is small and the excitation efficiency is low (less than 70%); the emissio...

technical field

[0001] The invention relates to the technical field of semiconductors, in particular to a white LED packaging structure and a white light source system. Background technique

[0002] A light-emitting diode (LED for short) is a solid semiconductor light-emitting device. Existing LED lighting devices generally use blue LEDs to excite green, yellow, and red phosphors to obtain mixed white light. However, due to the discontinuity of the white light spectrum, some color rendering indexes are lower than 90. And the white light LED made of the existing blue light chip has obvious blue light hazards (such as figure 1 and 2 Shown), causing widespread debate among the industry and consumers.

[0003] Using violet light chips or near-violet light chips to excite RGB three-color phosphors can realize continuous spectrum and achieve the effect similar to solar spectrum (such as image 3 and 4 shown). However, after changing to a purple light chip, the wavelength dif...

Examples

Embodiment 1

[0045] Such as Figure 5As shown, the present embodiment provides a white LED packaging structure, including: a base material (Base); the LED chip is located on the base material; the wavelength conversion material layer is located on the LED chip; wherein the LED chip is selected from a Violet chip ) and a blue chip (Blue chip), the wavelength of the purple chip is 385~425nm, preferably 410~420nm, the wavelength of the blue chip is 440~460nm, preferably 445~460nm, the wavelength conversion material layer can include wavelength conversion materials of two wavelengths, wherein One kind of wavelength conversion material is excited by the violet LED chip, and the emission spectrum wavelength is between 440 and 600nm. The other wavelength conversion material is excited by the blue light chip chip, and the emission spectrum wavelength is between 500 and 700nm. At 450-700nm, the wavelength conversion material layer absorbs the light emitted by the LED chip to emit white light.

[0...

Embodiment 2

[0053] Such as Figure 7 As shown, the difference from Example 1 is that the G phosphor and the R phosphor of this embodiment are mixed and covered on the blue light chip, while the B phosphor is alone covered on the purple light chip. Specifically, the wavelength of the purple light chip is 410nm~420nm, and the wavelength of the blue light chip is 445nm~460nm. The excitation wavelength of B phosphor is 390nm, which can better absorb violet light and emit blue light with a wavelength of about 460nm. G phosphor can choose Lu 3 al 5 o 12 : Ce 3+ Phosphors: The excitation wavelength is 450nm, LuAG hardly absorbs violet light, and the emission wavelength is about 550nm. R phosphor can choose AEC:Eu 2+ (AE=Ca and Sr) Phosphors, among which AE=Ca has the best effect: the excitation wavelength is around 450nm, and the excitation efficiency is high (higher than 80%). Under the condition of 410nm~420nm, the wavelength intensity is small, and the excitation efficiency Low (less ...

Embodiment 3

[0058] Such as Figure 10 As shown, the difference from Example 1 is that the GY (yellow-green) phosphor and B phosphor of this embodiment are mixed and covered on the purple light chip, while the R phosphor is alone covered on the blue light chip. Specifically, the wavelength of the purple light chip is 410~420nm, and the wavelength of the blue light chip is 445~460nm. The excitation wavelength of B phosphor is 390nm, which can better absorb violet light and emit blue light with a wavelength of about 460nm. GY phosphor can choose Eu-doped alkaline earth silicate Phosphors: the maximum excitation wavelength is 410nm, and the excitation efficiency reaches the highest between emission wavelength 500~600nm. R phosphor can choose AEC:Eu 2+(AE=Ca andSr) Phosphors, among which AE=Ca has the best effect: the excitation wavelength is around 450nm, and under the condition of 410~420nm, the wavelength intensity is small and the excitation efficiency is low (less than 70%); the emissio...

Images