High color rendering, long life magnetic ring coupled plasma light source and preparation method thereof

Abstract

This invention discloses a high color rendering index (Ra) and long lifespan magnetic ring-coupled plasma light source and its preparation method. The light source is an electrodeless source, comprising a bulb shell, an inorganic ceramic protective layer, a luminescent filler encapsulated inside the bulb shell, a mixed buffer gas, and a magnetic ring coupler fitted outside the bulb shell. The luminescent filler contains sulfur (S), selenium (Se), rare earth triiodine compounds, alkali metal bromine compounds, and alkali metal iodine compounds. The mixed buffer gas is a mixture of argon (Ar) and krypton (Kr) or argon (Ar) and xenon (Xe). The preparation method includes five steps: bulb shell pretreatment, inorganic ceramic protective layer preparation, luminescent filler filling, vacuuming and gas filling, and fusion sealing. This invention achieves ultra-high color rendering indexes (Ra>95, R9>90) by optimizing the luminescent formula and structural design. It contains no toxic substances and meets environmental standards, solving the technical pain points of poor color rendering, short lifespan, and insufficient environmental friendliness of traditional plasma light sources.

Description

Technical Field

[0001] This invention relates to the field of lighting technology, specifically to a magnetic ring coupled plasma light source with high color rendering and long lifespan, and its preparation method. Background Technology

[0002] Plasma light sources (especially sulfur-based magnetic ring coupled plasma light sources) have broad application prospects in professional lighting due to their high luminous efficiency and wide spectral characteristics. However, existing technologies for such light sources have many technical limitations, making it difficult to meet the needs of high-end applications. 1. Poor color rendering: Traditional sulfur-based plasma light sources mostly use pure sulfur or sulfur + selenium light-emitting formulas, with a low color rendering index (Ra≈80). Among them, the special color rendering index of red is R9<50, which is insufficient. In the GSM08-01 stage color chart, the reproduction deviation of magenta (58B) is ΔE>8. The color distortion can be clearly distinguished by the naked eye, which cannot meet the requirements of stage, photography and other scenes with high requirements for color fidelity. 2. Insufficient environmental friendliness: Some improved formulas add toxic elements such as thallium (Tl) to enhance color development, which does not comply with global environmental regulations such as RoHS and poses safety hazards; 3. Short lifespan: The iodine compounds in the luminescent filler have poor thermal and chemical stability and are easy to decompose, resulting in severe light decay of the light source. At the same time, the decomposition products are easy to react with the bulb, causing the bulb to blacken. The lifespan of traditional metal halide lamps is only 500 hours, and frequent replacement affects the efficiency of use. 4. Spectral discontinuity: Although LED light sources can achieve CRI>95, they are point light sources, and their spectrum is missing between green and blue, which cannot achieve the continuous spectrum effect of sunlight, resulting in limited color reproduction.

[0003] Therefore, developing a magnetic ring-coupled plasma light source with high color rendering, long lifespan, environmental friendliness, and continuous spectrum, as well as its preparation method, has become an urgent need in the current professional lighting field. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention aims to solve the technical problems of poor color rendering, short lifespan, insufficient environmental friendliness, and discontinuous spectrum in traditional magnetic ring coupled plasma light sources. It provides a magnetic ring coupled plasma light source with high color rendering, long lifespan, environmental safety, and continuous spectrum, as well as its preparation method, achieving a synergy between ultra-high color rendering and long lifespan, and meeting the usage requirements of high-end professional lighting scenarios.

[0005] To solve the above-mentioned technical problems, the present invention achieves this through the following solution: The present invention provides a high color rendering, long-life magnetic ring-coupled plasma light source, which is an electrodeless light source, comprising: A sealed blister pack, wherein at least one blister pack is provided; An inorganic ceramic protective layer covering the inner surface of the bubble shell; Luminescent filler encapsulated inside a blister pack; A mixed buffer gas filling the inside of the bubble shell; A magnetic ring coupler fitted onto the outside of the bubble shell; The luminescent filler comprises sulfur (S), selenium (Se), rare earth triiodine compounds, alkali metal bromine compounds, and alkali metal iodine compounds; the mixed buffer gas comprises a first mixed gas of argon (Ar) and krypton (Kr) or a second mixed gas of argon (Ar) and xenon (Xe).

[0006] Furthermore, the inorganic ceramic protective layer is made of one or more of alumina (Al2O3), yttrium oxide (Y2O3), and aluminum nitride (AlN).

[0007] Furthermore, the rare earth triiodine compound includes at least one of dysprosium iodide (DyI3), holmium iodide (HoI3), cerium iodide (CeI3), and thulium iodide (TmI3).

[0008] Furthermore, when the rare earth triiodine compound contains dysprosium iodide (DyI3), holmium iodide (HoI3), and cerium iodide (CeI3), the molar ratio of dysprosium iodide (DyI3), holmium iodide (HoI3), and cerium iodide (CeI3) is 4~6:2~4:0.5~2.

[0009] Furthermore, the alkali metal bromine compound is cesium bromide (CsBr). When the rare earth triiodine compound is dysprosium iodide (DyI3), the mass ratio of dysprosium iodide (DyI3) to CsBr is 5~10:1.

[0010] Furthermore, the alkali metal iodine compound includes at least one of sodium iodide (NaI) and cesium iodide (CsI).

[0011] Furthermore, the luminescent filler also includes an excess of halogen, which is elemental iodine I2; The luminescent filler also includes one of europium iodide (EuI2) and indium iodide (InI).

[0012] Furthermore, the magnetic ring coupler is made of Litz wire and its operating frequency is dynamically adjustable in the range of 10MHz to 5.6GHz.

[0013] Furthermore, in the mixed buffer gas, the molar ratio of sulfur (S) to selenium (Se) is 60:40 to 80:20, and both sulfur and selenium exist in the form of nanoparticles with a particle size range of 10 to 300 nm. In the mixed buffer gas, the volume percentage of krypton (Kr) is 1% to 10%.

[0014] The present invention discloses a method for preparing a plasma light source, the method comprising the following steps: S1, Bubble shell pretreatment: The bubbles are cleaned in multiple steps to remove surface impurities and hydroxyl groups, and then vacuum baked. S2, Preparation of inorganic ceramic protective layer: An inorganic ceramic protective layer with a thickness of 30nm~500nm is prepared on the inner surface of the bubble shell using atomic layer deposition technology or sol-gel method; S3, Luminescent filler filling: Sulfur, selenium, rare earth iodine compounds, alkali metal iodine compounds, alkali metal bromine compounds and excess elemental iodine are mixed evenly in a preset ratio and filled into the pretreated bubble shell, controlling the partial pressure of sulfur vapor to be 0.8±0.05kPa and the partial pressure of selenium vapor to be 0.3±0.05kPa. S4, Vacuuming and Inflation: The bubble shell after filling with luminescent filler is vacuumed to ensure a vacuum level ≤10. -4 Pa, then argon (Ar) and krypton (Kr) or argon (Ar) and xenon (Xe) are introduced to form a mixed buffer gas; S5, Fusion Sealing: Maintaining the stability inside the bulb, fusion sealing is performed to form a sealed bulb, completing the light source preparation.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The plasma light source of this invention has high color rendering: through the synergistic effect of the S / Se / DyI3 / InI / CsBr pentagonal light-emitting formula, it fills the spectral depression of traditional sulfur-based light sources, achieving a color rendering index Ra>95, R9>90, color difference ΔE (GSM58B)≤1.2, a spectrum that is close to daylight, no blue light peak of LEDs, and a color gamut coverage of 105% of NTSC, far exceeding traditional sulfur-based light sources and LED light sources, with high color fidelity; 2. The plasma light source of this invention is environmentally friendly and safe: it completely eliminates toxic substances such as thallium and cadmium, and all luminescent components comply with global environmental regulations such as RoHS and REACH, making it safe to use without any hidden dangers; 3. The plasma light source of the present invention has an increased service life: The inorganic ceramic protective layer on the inner surface of the bulb can effectively block the reaction between the luminescent material and the bulb, inhibit the blackening of the bulb, and at the same time, the addition of excessive iodine inhibits the thermal decomposition of rare earth iodine compounds, so that the light source has a light decay of <5% after 1000 hours and a light flux maintenance rate of ≥96% after 2000 hours, and its service life is far greater than that of traditional metal halide lamps and ordinary plasma light sources. 4. The plasma light source of this invention has fast start-up and strong stability: the krypton in the mixed buffer gas utilizes the Penning effect to reduce the decomposition energy barrier of DyI3 by 30%-50%, shortening the start-up time of the light source to <1 second; the operating frequency of the magnetic ring coupler can be dynamically adjusted to adapt to different power requirements, and the luminous stability is high. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the plasma light source of the present invention.

[0017] Figure 2 This is a schematic diagram illustrating the steps of the plasma source preparation method of the present invention.

[0018] The attached diagram is labeled: 1 - Bubble shell. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention. Obviously, the embodiments described in this invention are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Example 1: The specific structure of the present invention is as follows: Please refer to the appendix. Figure 1 This embodiment provides a magnetic ring-coupled plasma light source with high color rendering and long lifespan. This light source is an electrodeless light source and includes: The sealed bubble 1 has a maximum outer diameter of 20 mm and a SiO2 content of >99.999%. The bubble 1 adopts a closed and transparent rotating body structure. An Al2O3 protective layer covering the inner surface of bubble shell 1, the thickness of which is 30 nm; The light-emitting filler encapsulated inside the bubble shell 1; A mixed buffer gas, and a magnetic ring coupler fitted outside the bubble shell 1.

[0022] The molar ratio of the luminescent filler is: sulfur (S) 70 parts, selenium (Se) 18 parts, DyI 3-5 parts, HoI 3-3 parts, CeI 3-1 part, NaI 2 parts, and CsI 1 part, with an excess of elemental iodine (I2) added (1.5% of the total mass of the rare earth metal halide compounds); sulfur and selenium exist in the form of nanoparticles with a particle size of 80±5 nm; the mixed buffer gas is Ar+3%Kr; the magnetic ring coupler is made of Litz wire and operates at a frequency of 100MHz.

[0023] The preparation method of this plasma light source is as follows: S1, Bubble shell pretreatment: Select 1 bubbles of the above specifications, and ultrasonically clean them with acetone, ethanol and deionized water for 15 minutes each to remove surface impurities and hydroxyl groups. Then bake them at 1000℃ in a vacuum environment for 2 hours. S2, Preparation of Al2O3 protective layer: Atomic layer deposition (ALD) was used to place bubble 1 in the ALD reaction chamber, and trimethylaluminum and water were used as precursors. 300 cycles were deposited at a base temperature of 200℃ to form a dense Al2O3 film with a thickness of about 30nm. S3, Luminescent filler filling: Weigh each component according to the above molar ratio, mix and grind them in an argon glove box until uniform, take 5.0 mg of the mixture and fill it into bubble shell 1, control the sulfur vapor partial pressure to be 0.8±0.05 kPa and the selenium vapor partial pressure to be 0.3±0.05 kPa. S4, Vacuuming and Inflating: Connect bubble shell 1 to the vacuum system and evacuate to 5.0 × 10⁻⁶. -6 Torr, then fill with a mixture of Ar + 3% Kr gas to a pressure of 200 Torr; S5, Fusion Sealing: Using a CO2 laser to maintain a stable internal atmosphere, the exhaust tailpipe is fused and sealed to form a sealed bulb, thus completing the light source preparation.

[0024] Performance test: The finished bulb was installed in a 100W magnetic ring coupler and lit. The initial test results were: luminous flux 9500lm, correlated color temperature 4500K, color rendering index Ra=96, R9=93; after 2000 hours of continuous operation, the luminous flux maintenance rate was 97.5%, the color temperature drift was less than 50K, and there was no blackening of the bulb. Example 2:

[0025] The difference between this embodiment and Embodiment 1 is that the inorganic ceramic protective layer is a Y2O3 thin film (150nm thick), prepared by the sol-gel method; the molar ratio of S:Se in the luminescent filler is adjusted to 65:22 to obtain a slightly lower color temperature (3500K).

[0026] In the specific preparation process, step S2 is replaced by: preparing yttrium alkoxide sol, injecting it into the inside of the bubble shell 1 through a precision syringe, rotating it at low speed to make it evenly cover the inner wall, and then heat-treating it at 600°C for 1 hour to form a Y2O3 film with a thickness of about 150nm; the remaining steps are the same as in Example 1.

[0027] Performance testing: Initial color rendering index Ra=95, R9=92; after 2000 hours of continuous operation, the luminous flux maintenance rate is 96.8%, the color temperature drift is less than 40K, and the bulb shell shows no obvious blackening. Example 3:

[0028] The difference between this embodiment and Embodiment 1 is that 0.5 parts of europium iodide (EuI2) are added to the luminescent filler to enhance the deep red spectrum.

[0029] In the specific preparation process, in step S3, 0.5 parts of EuI2 are added to the luminescent filler mixture, and the remaining steps are the same as in Example 1.

[0030] Performance testing: Initial color rendering index Ra=96, R9=98 (reaching an extremely high level); after 2000 hours of continuous operation, the luminous flux maintenance rate is 96.2%, and the deep red reproduction is excellent.

[0031] Comparative example (traditional formula light source): The same size bubble shell without an inner protective layer was used, filled with a traditional sulfur-selenium-thallium (TlI) formula, and the rest of the structure and preparation process were the same as in Example 1.

[0032] Performance test: Initial color rendering index Ra=88, R9=15; after 500 hours of continuous operation, the luminous flux dropped to 80% of the initial value, and the inner wall of the bulb showed obvious blackening, making it impossible to continue normal use.

[0033] The test data of the above embodiments and comparative examples are compared in the table below: The test data above show that the magnetic ring coupled plasma light source provided by this invention far surpasses traditional formula light sources in terms of color rendering, lifespan, and stability, and can effectively solve the technical pain points of existing technologies. Example 4:

[0034] The difference between this embodiment and Embodiment 1 is that indium iodide (InI) is added to the luminescent filler as a spectral enhancer in the blue-violet region, and the proportion of the five-element formula is adjusted to suit the 5500K color temperature requirement. The specific optimizations are as follows: The molar ratio of the luminescent filler is: S: 65 parts, Se: 20 parts, DyI3: 3 parts, InI: 8 parts, CsBr: 0.6 parts (3.0% of the total mass of rare earth metal halide compounds), NaI: 3 parts, with an excess of elemental iodine I2 (2.0% of the total mass of rare earth metal halide compounds); sulfur and selenium exist in the form of nanoparticles with a particle size of 100±5 nm; the mixed buffer gas is Ar+5%Kr; the magnetic ring coupler operates at a frequency of 500 MHz.

[0035] In the specific preparation process, step S3 is replaced by: weighing each component according to the above molar ratio, mixing and grinding them in an argon glove box until uniform, taking 5.2 mg of the mixture and filling it into bubble shell 1, controlling the partial pressure of sulfur vapor to be 0.8±0.05 kPa and the partial pressure of selenium vapor to be 0.3±0.05 kPa; the remaining steps are the same as in Example 1.

[0036] Performance testing: Initial color rendering index Ra=95, R9=91, correlated color temperature 5500K; after 2000 hours of continuous operation, the luminous flux maintenance rate is 96.5%, the spectral intensity in the blue-violet region increases by 12%, the color temperature drift is less than 45K, and there is no blackening of the bubble shell. Example 5:

[0037] The difference between this embodiment and Example 1 is that the CsBr addition ratio is optimized, the Al2O3 protective layer is prepared using the sol-gel method, and it is adapted to a warm white temperature of 3000K. The specific optimizations are as follows: 1. Inorganic ceramic protective layer: Al2O3 film was prepared by combining sol-gel method and dip coating method. Aluminum alkoxide sol was prepared, dip coated and then heat treated at 600℃ for 1 hour to form a dense Al2O3 film with a thickness of about 100nm. 2. The molar ratio of the luminescent filler is: S: 75 parts, Se: 15 parts, DyI3: 8 parts, HoI3: 4 parts, CsBr: 1.2 parts (6.0% of the total mass of rare earth metal halide compounds), CsI: 2 parts, with an excess of elemental iodine I2 (1.0% of the total mass of rare earth metal halide compounds); sulfur and selenium exist in the form of nanoparticles with a particle size of 60±5 nm; the mixed buffer gas is Ar+2%Kr; the magnetic ring coupler operates at a frequency of 200MHz.

[0038] In the specific preparation process, steps S2 and S3 are adjusted according to the above-mentioned optimized parameters, and the remaining steps are the same as in Example 1.

[0039] Performance testing: Initial color rendering index Ra=97, R9=94, correlated color temperature 3000K; after 2000 hours of continuous operation, the luminous flux maintenance rate is 97.2%, the red light region has excellent color reproduction, the attenuation coefficient λ is significantly reduced, and the bulb does not blacken, which meets the requirements of warm light lighting scenarios.

[0040] The test data above show that the magnetic ring coupled plasma light source provided by this invention far surpasses traditional formula light sources in terms of color rendering, lifespan, and stability, and can effectively solve the technical pain points of existing technologies. Example 6:

[0041] 1. The specific ratio range of the pentagonal formulation S / Se / DyI3 / InI / CsBr; 1) The core of the formulation is a ternary system of sulfur (S), selenium (Se), and dysprosium iodide (DyI3). The S / Se ratio precisely controls the color temperature and luminous efficacy, while DyI3 provides a rich continuous spectrum, especially deep red radiation. Indium iodide (InI) can be added as a spectral enhancer in the blue-violet region, and cesium bromide (CsBr) can be added as an excitation promoter to fill the red region. It is filled in a mixed buffer gas of high-purity argon (Ar) and krypton (Kr).

[0042] 2) It is clear that the non-toxic and environmentally friendly S-Se-DyI3-InI combination is the best practice for achieving top-quality light, which differentiates it from toxic formulations containing thallium.

[0043] 3) Ingredient Examples 4) Se vapor partial pressure 0.8±0.05 kPa; -ZnSe nanoparticles (particle size 80±5 nm, concentration 1.0-1.5×10⁻⁶) 12 / cm 3 ), particle size 10-300nm; -CsBr thermal decomposition produces Cs atoms (2CsBr→2Cs+Br2 (thermal decomposition>300℃)), (Cs+e - →Cs + +2e - (Reduce ionization energy); (CsBr or other alkali metal halide content 0.01-0.20wt%); Kr ratio 1-10%; 2. Preparation method of Al2O3 protective film for inner wall of bubble shell (sol-gel method + heat treatment); Sol-gel method for depositing aluminum oxide film, using a combination of sol-gel method and dip coating / spin coating method, can prepare transparent and dense aluminum oxide (Al2O3) film on glass substrate. This film can effectively block the direct contact between luminescent material (especially active indium and dysprosium ions) and bubble shell (SiO2), slow down chemical reaction, and thus significantly delay the "blackening" process of bubble shell and improve lifespan; Physical barrier: Prevents reactive substances such as sulfur and selenium from reacting with silicon in quartz glass to form black silicon sulfide / silicon selenide.

[0044] Chemical inertness: Ceramic materials such as alumina are chemically stable at high temperatures and do not easily react with luminescent substances.

[0045] For the light decay model, it can be pointed out that the decay coefficient λ is negatively correlated with the quality of the protective layer (density, thickness) and the concentration of the stabilizer, thus linking structural innovation with performance prediction.

[0046] 3. Inflation process parameters (vacuum degree ≤ 10) -4 Pa, preheating and degassing); ensure the purity of the filling material (≥99.99%) and the vacuum degree (≤10).-4 Pa) and the preheating and degassing process of the blister pack during sealing to eliminate the promotion of side reactions by catalysts such as water and oxygen. 4. The technique of adding excess iodine (I2) to stabilize iodine compounds; halogen compensation technology: It is clearly stated in the instructions that an excess of 0.5%-3% pure iodine (I2) should be added to the formula to increase the halogen partial pressure and inhibit the thermal decomposition of rare earth iodine compounds by utilizing the principle of chemical equilibrium. This is the key to ensuring the long-term stability of luminescent materials in this field.

[0047] 5. Proportion adjustment formulas applicable to different color temperatures (3000K-6500K). InI ratio 10%-60%; CsBr ratio 3-30%; S / Se ratio 25%-50%; DyI3 ratio 3%-15%; color temperature varies from 1500K-10000K, spectral characteristics range from neutral white to cool white, and ultra-cool white; 4. The correspondence between the gas decomposition mechanism and the patent claims: 1. Bubble preparation: Select spherical high-purity bubble shells with an outer diameter of 20mm (SiO2>99.999%), and after ultrasonic cleaning with acetone, ethanol and deionized water, bake at 1000°C in a vacuum environment for 2 hours to remove hydroxyl groups.

[0048] 2. ALD deposition of Al2O3 protective layer: The bubble shell is placed in the ALD reaction chamber, and trimethylaluminum and water are used as precursors. 300 cycles are deposited at a base temperature of 200°C to form a dense Al2O3 film with a thickness of about 30 nm.

[0049] 3. Preparation of luminescent material: Weigh the components according to the following molar ratio: S: 70 parts, Se: 18 parts, DyI3: 5 parts, HoI3: 3 parts, CeI3: 1 part, NaI: 2 parts, CsI: 1 part. Mix and grind until homogeneous in an argon glove box.

[0050] 4. Filling and Sealing: Fill 5.0 mg of the above mixture into the blister pack. Connect the blister pack to the vacuum system and evacuate to 5.0 × 10⁻⁶. -6 Torr, then fill with a mixture of Ar + 3% Kr to a pressure of 200 Torr. Finally, use a CO2 laser to fuse and seal the exhaust tailpipe while maintaining vacuum and pressure.

[0051] 5. Performance Testing: The finished bulb was installed in a 100W magnetic ring coupler and lit. Initial test results were: luminous flux 9500lm, correlated color temperature 4500K, color rendering index Ra=96, R9=93. After 2000 hours of continuous operation, the luminous flux maintenance rate was 97.5%, and the color temperature drift was less than 50K.

[0052] The difference between this embodiment and Example 1 lies in the preparation of the protective layer: the Y₂O₃ protective layer is prepared using the sol-gel method. A yttrium alkoxide sol is prepared and injected into the bubble shell using a precision syringe. The sol is then rotated at low speed to uniformly cover the inner wall, followed by heat treatment at 600°C for 1 hour to form a Y₂O₃ film with a thickness of approximately 150 nm. The S:Se ratio in the luminescent material is adjusted to 65:22 to obtain a slightly lower color temperature (4500 K).

[0053] Test results: Ra=95, R9=92. Luminous flux maintenance rate after 2000 hours is 96.8%.

[0054] In summary, this invention provides an environmentally friendly, high-efficiency, and high-color-rendering plasma luminescent formula that can generate a continuous spectrum with a high color rendering index, wide color gamut coverage, and ideal color temperature. This invention belongs to the technical field of professional stage, projection, vehicle lighting, lithography machine, photographic lighting, and related indoor and outdoor lighting technologies, specifically relating to a gas-filling formula for LEP light sources, solving the problem of color distortion in clothing caused by insufficient color rendering of traditional sulfur-based LEP.

[0055] Sulfur-based LEP lamps have shortcomings in color rendering. While sulfur lamps have good spectra, their color rendering is insufficient. Early rare-earth formulations contained toxic substances such as thallium. Metal halide lamps have a CRI of approximately 85, but a lifespan of only 500 hours (frequent replacements affect performances). Although LEDs have a CRI of over 95, their point light source spectrum lacks the spectral range between green and blue, resulting in a lack of continuous exposure to sunlight.

[0056] This invention features a continuous spectrum close to sunlight, with no blue light peak from LEDs; high color gamut coverage: 105% NTSC vs 85% LED. The market urgently needs a green formula that achieves top-tier optical performance while complying with modern environmental regulations (such as RoHS and REACH). This invention discloses a high color rendering and long lifespan magnetic ring-coupled plasma light source and its fabrication method. The core innovation of this bulb lies in the formation of an inorganic ceramic protective layer (such as Al2O3) on the inner wall of the bulb shell, and the use of an environmentally friendly luminescent material composed of sulfur, selenium, a specific combination of rare earth iodine compounds (DyI3, HoI3, CeI3), and alkali metal iodine compounds. The fabrication method includes key processes such as bulb shell pretreatment, protective layer deposition, precise filling of the luminescent material, vacuum filling, and laser sealing. This invention successfully solves the two major problems of insufficient color rendering and short lifespan of traditional LEP bulbs, achieving ultra-high color rendering (Ra≥95, R9≥90) and an ultra-long lifespan of less than 5% light decay after 2000 hours, making it particularly suitable for professional lighting applications with extremely high requirements for color fidelity and reliability.

[0057] The plasma light source of this invention has high color rendering: through the synergistic effect of the S / Se / DyI3 / InI / CsBr pentagonal light-emitting formula, it fills the spectral depression of traditional sulfur-based light sources, achieving a color rendering index Ra>95, R9>90, color difference ΔE (GSM58B)≤1.2, a spectrum that is close to daylight, no blue light peak without LEDs, and a color gamut coverage of 105% of NTSC, far exceeding traditional sulfur-based light sources and LED light sources, with high color fidelity; The plasma light source of this invention is environmentally friendly and safe: it completely eliminates toxic substances such as thallium and cadmium, and all luminescent components comply with global environmental regulations such as RoHS and REACH, making it safe to use without any hidden dangers; The plasma light source of this invention has an increased lifespan: the inorganic ceramic protective layer on the inner surface of the bulb can effectively block the reaction between the luminescent material and the bulb, inhibiting the blackening of the bulb. At the same time, the addition of excessive iodine inhibits the thermal decomposition of rare earth iodine compounds, making the light source have a light decay of <5% after 1000 hours and a light flux maintenance rate of ≥96% after 2000 hours. Its lifespan far exceeds that of traditional metal halide lamps and ordinary plasma light sources. The plasma light source of this invention features rapid start-up and high stability: the krypton in the mixed buffer gas utilizes the Penning effect to reduce the decomposition energy barrier of DyI3 by 30%-50%, shortening the start-up time of the light source to <1 second; the operating frequency of the magnetic ring coupler can be dynamically adjusted to adapt to different power requirements, resulting in high luminous stability.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A magnetic ring-coupled plasma light source with high color rendering and long lifespan, characterized in that, This light source is an electrodeless light source, which includes: A sealed blister (1), wherein at least one blister (1) is provided; An inorganic ceramic protective layer covering the inner surface of the bubble shell (1); A light-emitting filler encapsulated inside a bubble shell (1); Mixed buffer gas filling the inside of the bubble shell (1); A magnetic ring coupler fitted outside the bubble shell (1); The luminescent filler contains sulfur (S), selenium (Se), rare earth triiodine compounds, alkali metal bromine compounds, and alkali metal iodine compounds. The mixed buffer gas includes either a first mixed gas of argon (Ar) and krypton (Kr) or a second mixed gas of argon (Ar) and xenon (Xe).

2. The high color rendering, long lifespan magnetic ring-coupled plasma light source according to claim 1, characterized in that, The inorganic ceramic protective layer is made of one or more of alumina (Al2O3), yttrium oxide (Y2O3), and aluminum nitride (AlN).

3. The high color rendering, long lifespan magnetic ring-coupled plasma light source according to claim 1, characterized in that, The rare earth triiodine compound includes at least one of dysprosium iodide (DyI3), holmium iodide (HoI3), cerium iodide (CeI3), and thulium iodide (TmI3).

4. The high color rendering, long lifespan magnetic ring-coupled plasma light source according to claim 3, characterized in that, When the rare earth triiodine compound contains dysprosium iodide (DyI3), holmium iodide (HoI3), and cerium iodide (CeI3), the molar ratio of dysprosium iodide (DyI3), holmium iodide (HoI3), and cerium iodide (CeI3) is 4~6:2~4:0.5~2.

5. A high color rendering, long lifespan magnetic ring-coupled plasma light source according to claim 3, characterized in that, The alkali metal bromine compound is cesium bromide (CsBr). When the rare earth triiodine compound is dysprosium iodide (DyI3), the mass ratio of dysprosium iodide (DyI3) to CsBr is 5~10:

1.

6. The high color rendering, long lifespan magnetic ring-coupled plasma light source according to claim 1, characterized in that, The alkali metal iodine compound includes at least one of sodium iodide (NaI) and cesium iodide (CsI).

7. The high color rendering, long lifespan magnetic ring-coupled plasma light source according to claim 1, characterized in that, The luminescent filler also includes an excess of halogen, which is elemental iodine I2. The luminescent filler also includes one of europium iodide (EuI2) and indium iodide (InI).

8. The high color rendering, long lifespan magnetic ring-coupled plasma light source according to claim 1, characterized in that, The magnetic ring coupler is made of Litz wire and its operating frequency is dynamically adjustable in the range of 10MHz to 5.6GHz.

9. A high color rendering, long lifespan magnetic ring-coupled plasma light source according to claim 1, characterized in that, In the mixed buffer gas, the molar ratio of sulfur (S) to selenium (Se) is 60:40 to 80:20, and both sulfur and selenium exist in the form of nanoparticles with a particle size range of 10 to 300 nm. In the mixed buffer gas, the volume percentage of krypton (Kr) is 1% to 10%.

10. A method for preparing a plasma light source, the method being used to prepare the plasma light source according to any one of claims 1-9, characterized in that, The preparation method includes the following steps: S1, Bubble shell pretreatment: The bubble shell (1) is cleaned in multiple steps to remove surface impurities and hydroxyl groups, and then vacuum baked. S2, Inorganic ceramic protective layer preparation: An inorganic ceramic protective layer with a thickness of 30nm~500nm is prepared on the inner surface of the bubble shell (1) using atomic layer deposition technology or sol-gel method; S3, Luminescent filler filling: Sulfur, selenium, rare earth iodine compounds, alkali metal iodine compounds, alkali metal bromine compounds and excess elemental iodine are mixed evenly in a preset ratio and filled into the pretreated bubble shell, controlling the partial pressure of sulfur vapor to be 0.8±0.05kPa and the partial pressure of selenium vapor to be 0.3±0.05kPa. S4, Vacuuming and Inflation: The bubble shell after filling with luminescent filler is vacuumed to ensure a vacuum level ≤10. -4 Pa, then argon (Ar) and krypton (Kr) or argon (Ar) and xenon (Xe) are introduced to form a mixed buffer gas; S5, Fusion sealing: Maintain the stability inside the bubble (1), perform fusion sealing to form a sealed bulb, and complete the light source preparation.

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