TWI404240B - Colorful light-emitting apparatus - Google Patents

Abstract

A colorful light-emitting apparatus is described. A light-emitting device generates light having a first wavelength, which excites a first, a second and a third fluorescent material. The first, a second and a third fluorescent material respectively emit lights having a second wavelength, a third wavelength and a fourth wavelength to form a colorful light. The first, the second and the third fluorescent material cover the light-emitting device. The first fluorescent material is a Eu-actived metal oxide. The second fluorescent material is an actived rare-earth oxynitride. The third fluorescent material is a Eu-actived oxynitride.

Description

Color illuminating device

The present invention relates to a light emitting device, and more particularly to a color light emitting device.

There are two main methods for fabricating a color light-emitting diode. One way is to directly emit color light sources of different wavelengths, such as red light, orange light, yellow light, blue light or green light, in the light emitting diode chip. However, since the wavelength of the illuminating light source is difficult to adjust, and the half-wavelength of the wavelength of the light source is fixed, the color that can be changed is small.

Another way is to use the light-emitting diode chip and the phosphor powder to make the light emitted by the light-emitting diode chip to emit the fluorescent powder, and to form a new light source by mixing light. However, since the phosphor powder absorbs the light emitted by the LED chip and then excites the light, the luminous efficiency of the light source is not only worse than that of the pure wafer type light emitting diode, and its brightness is The stability is also relatively low.

Therefore, there is a need for an improved color illuminating device to solve the above problems.

According to an embodiment of the invention, a color illuminating device is proposed. The light emitting element emits light having a first wavelength, and excites the first fluorescent material, the second fluorescent material and the third fluorescent material to emit light of the second wavelength, the third wavelength and the fourth wavelength, respectively. To mix into a colored light. The first, second and third phosphor materials are all disposed on the light-emitting element, and the materials of the first, second and third phosphor materials are respectively a metal-activated metal oxide and a rare earth metal activated Nitrogen oxides and ruthenium metal activated oxynitrides.

The first wavelength range is between 360 nm and 420 nm, the second wavelength range is between 420 nm and 480 nm, the third wavelength range is between 510 nm and 550 nm, and the fourth wavelength range is between 560 nm and 640 nm. between.

The invention provides a color light-emitting device which uses ultraviolet light or violet light to excite the phosphorescent powder of nitrogen oxide and the metal oxide activated by the base metal to generate a diversified color light source and greatly improve the stability of the device. The arrangement of the oxynitride fluorescein and the ruthenium metal activated metal oxide may be directly applied to the illuminating element or the encapsulant may be used, but not limited thereto. The spirit and scope of the present invention will be apparent from the following description of the preferred embodiments of the invention. The spirit and scope.

In an embodiment of the present invention, the color light-emitting device of the present invention mainly comprises a light-emitting element and an encapsulant coated thereon, wherein the encapsulant has a first phosphor powder, a second phosphor powder and a first Three fluorescent powders are scattered in it. The first fluorescent material, the second fluorescent material and the third fluorescent material are respectively a metal activated metal oxide, a rare earth metal activated nitrogen oxide and a base metal activated nitrogen oxide. In general, the color light-emitting device may further include a carrying device for carrying the light-emitting element, such as a circuit board or a bracket, but is not limited thereto.

The above-mentioned light-emitting element may be, for example, a light-emitting diode, and the light-emitting element is composed of at least one semiconductor material. Among them, the semiconductor material is preferably a multi-component composite compound of the III-V group.

The first fluorescent material is a metal-activated metal oxide, and its chemical formula can be, for example, (M _1-xy , Q _x , Eu _y ) Mg ₂ Al ₁₆ O ₂₇ , wherein M and Q are metal elements, , 0.01 < y < 0.20. The above metal element may be, for example, calcium, barium or strontium.

The second fluorescent material is composed of a rare earth metal-activated metal oxynitride, which may be activated, for example, by using a rare earth metal of cerium (Ce) and/or cerium (Tb). In an embodiment of the present invention, the chemical formula of the second fluorescent material may be, for example, (Y, M) _(m/val) Si _(12-mn) Al _(m+n) O _n N _(16-n) :Ce _s , Tb _t , where Y is a lanthanum element, M is a metal element, such as a calcium element or a lanthanum element, m represents the number of structural Al-N bonds, n represents the number of structural Al-O bonds, and val represents a metal The valence of the element M, and 0.8 < n < 2.0, 2.0 < m + n < 3.0, 0.1 < s < 0.5, 0 < t < 0.1.

The third phosphor material is composed of a metal oxynitride activated by a ruthenium metal. In an embodiment of the present invention, the chemical formula of the third fluorescent material may be, for example, (Y, M) _(m/val) Si _(12-mn) Al _(m+n) O _n N _(16-n) :Eu _z , wherein Y is a lanthanum element, M is a metal element, such as a calcium element or a lanthanum element, m represents the number of structural Al-N bonds, n represents the number of structural Al-O bonds, and val represents a metal element M The valence, and 0.8 < n < 2.0, 2.0 < m + n < 3.0, 20% < z < 50%.

In an embodiment of the invention, the light emitted by the light emitting element has a first wavelength, and the light emitted by the light emitting element can excite the first phosphor powder, the second phosphor powder and the third phosphor powder, and the first flutter After the light powder, the second phosphor and the third phosphor absorb the first wavelength, they are respectively excited to generate light having a second wavelength, a third wavelength, and a fourth wavelength. The light of the first wavelength emitted by the light-emitting element described above is mixed with the light of the second wavelength, the light of the third wavelength, and the light of the fourth wavelength to generate a colored light.

In an embodiment of the invention, the illuminating element may emit, for example, violet or ultraviolet light, and the first phosphor may be excited to emit blue light, and the second phosphor may be excited to emit green light. The three phosphors are excited to emit red light. Wherein, the first wavelength range mentioned above may be, for example, between 360 nm and 420 nm. The first phosphor powder can absorb the wavelength range of the excited light, for example, between 300 nm and 410 nm, and the second phosphor powder can absorb the wavelength range of the excited light, for example, between 360 nm and 480 nm, and The triple phosphor can absorb the wavelength range of the excited light, for example between 360 nm and 480 nm.

In this embodiment, the spectrum of the first phosphor powder after excitation by violet light is as shown in FIG. 1 , and the spectrum of the second phosphor powder after excitation by violet light is as shown in FIG. 2 , and the third phosphor powder is as shown in FIG. 2 . The spectrum after excitation by violet light is shown in Figure 3. In this embodiment, the first phosphor is excited to emit light having a second wavelength range, for example, between 420 nm and about 480 nm. In another embodiment, the second wavelength range can be between 440 nm and 460 nm. The light emitted by the second phosphor after excitation has a third wavelength range of, for example, between 500 nm and 570 nm. In another embodiment, the third wavelength range may be between 510 nm and 550 nm, more preferably between 520 nm and 540 nm. The light emitted by the third phosphor after excitation has a fourth wavelength range, for example, between 560 nm and 640 nm. In another embodiment, the fourth wavelength range is between 600 nm and 640 nm, more preferably between 610 nm and 630 nm.

In an embodiment of the invention, the violet light emitted by the light-emitting element, the blue light generated by the first phosphor powder, the green light generated by the second phosphor powder, and the red light generated by the third phosphor powder are mixed. A colored light can be produced, and the mixed light spectrum is as shown in Fig. 4. Alternatively, it is possible to emit light of different colors by adjusting the proportion of the phosphor powder, for example, it can be white light.

Therefore, it can be seen from the above embodiments that the present invention utilizes violet or ultraviolet light emitted by a light-emitting element to excite a metal oxide activated by a base metal, a nitrogen oxide activated by a rare earth metal, and a nitrogen oxide activated by a base metal. Mix into a colored light. Furthermore, the phosphor of oxynitride is not only excited by the light emitted by the light-emitting element, but also by the blue light emitted from the metal oxide phosphor activated by the base metal, that is, nitrogen oxide. The fluorescent powder of the object can be excited efficiently under the light source of violet light and blue light. In this way, the luminous efficiency can be improved.

In addition, since both the red phosphor powder and the green phosphor powder used in the present invention are metal nitrogen oxides, these phosphor powders can be stably present under high temperature and high humidity, and no cracking occurs, thereby being effective. Improve the stability and stability of the illuminating device. In addition, the color light-emitting device of the present invention can generate white light by adjusting different proportions of phosphor powder. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and retouched without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

Fig. 1 is a spectrum of a first phosphor powder excited by violet light in an embodiment of the present invention.

Fig. 2 is a spectrum of the second phosphor in an embodiment of the present invention after excitation by violet light.

Figure 3 is a spectrum of the third phosphor in an embodiment of the present invention after excitation by violet light.

Figure 4 is a spectrum of colored light produced by color mixing in an embodiment of the present invention.

Claims (13)

A color light-emitting device comprising: a light-emitting element capable of emitting light having a first wavelength; and a first fluorescent material disposed on the light-emitting element, the chemical formula of the first fluorescent material being (M _1-xy , Q _x ,Eu _y )Mg ₂ Al ₁₆ O ₂₇ , where M and Q are a metal element, 0 x<0.5, 0.01<y<0.20, the first fluorescent material absorbs the light of the first wavelength to excite the fluorescent light having a second wavelength; and a second fluorescent material is disposed on the light emitting element. The chemical formula of the second fluorescent material is (Y, M) _(m/val) Si _(12-mn) Al _(m+n) O _n N _(16-n) : Ce _s , Tb _t , where Y is 钇Element, M is a metal element, m represents the number of Al-N bonds in the structure, n represents the number of Al-O bonds in the structure, val represents the valence of the metal element M, 0.8 < n < 2.0, 2.0 < m + n<3.0, 0.1<s<0.5, 0<t<0.1, the second fluorescent material absorbs the light of the first wavelength to excite the fluorescent light having a third wavelength; and a third fluorescent material, Provided on the light-emitting element, the chemical formula of the third fluorescent material is (Y,M) _(m/val) Si _(12-mn) Al _(m+n) O _n N _(16-n) :Eu _z , Where Y is a lanthanum element, M is a metal element, m represents the number of structural Al-N bonds, n represents the number of structural Al-O bonds, and val represents the valence of the metal element M, 0.8 < n < 2.0, 2.0 <m+n<3.0,20%<z<50%, the third fluorescent material absorbs light of the first wavelength and excites fluorescence having a fourth wavelength, wherein First, the second, the third and the fourth wavelength of light are mixed into a colored light. The color light-emitting device of claim 1, wherein the light-emitting element is composed of at least one semiconductor material. The color light-emitting device of claim 2, wherein the at least one semiconductor material is a multi-component compound of Group III-V. The color light-emitting device of claim 1, wherein the first wavelength range is between 360 nm and 420 nm. The color light-emitting device of claim 1, wherein the first fluorescent material absorbs light in a wavelength range of between 300 nm and 410 nm. The color light-emitting device of claim 1, wherein the metal element comprises a calcium element, a barium element or a barium element. The color light-emitting device of claim 1, wherein the second wavelength range is between 420 nm and 480 nm. The color light-emitting device of claim 1, wherein the second fluorescent material absorbs light in a wavelength range of between 360 nm and 480 nm. The color light-emitting device of claim 1, wherein the metal element of the second fluorescent material is a calcium element or a barium element. The color light-emitting device of claim 1, wherein the third wavelength range is between 500 nm and 570 nm. The color light-emitting device of claim 1, wherein the third fluorescent material absorbs light in a wavelength range of between 360 nm and 480 nm. The color light-emitting device of claim 1, wherein the metal element of the third fluorescent material is a calcium element or a strontium element. The color light-emitting device of claim 1, wherein the fourth wavelength range is between 560 nm and 640 nm.