Luminescent glass preparation method and device for ultrafast laser welding and photoluminescence detection

Abstract

The invention discloses a preparation method and device of luminescent glass for ultrafast laser welding and photoluminescence detection. According to the method, a light-emitting functional material (rare earth oxide powder, quantum dots or fluorescent powder) is introduced between inorganic glass sheets, welding is conducted through ultrafast laser matched with a light-emitting ion absorption band, and precise distribution and stable combination of light-emitting centers are achieved. The method comprises the steps of cleaning, functional material introduction, fixing, atmosphere protection, parameter setting, welding and annealing treatment. The device comprises an ultrafast laser light source, a focusing optical system, a three-dimensional motion platform, a fixing clamp, an atmosphere protection cavity, a computer control system and an online photoluminescence detection module. Through verification, the luminescent glass prepared by the device has high bonding strength, high luminous efficiency and excellent stability, and is suitable for the fields of optical communication, display, sensing, laser devices and the like.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical functional inorganic glass processing and optoelectronic device manufacturing technology, and specifically relates to a luminescent glass preparation method and device based on ultrafast laser welding and photoluminescence detection, which is suitable for the fields of optical communication, display, sensing and laser devices. BACKGROUND

[0002] Luminescent glass is widely used in the fields of optical communication, solid-state laser, display device, sensor and quantum information due to its excellent photoluminescence characteristics. Traditional preparation methods mainly adopt high-temperature melting, sol-gel or doping sintering processes, which have problems such as uneven distribution of luminescent ions, low energy transfer efficiency, many interface defects and high production cost.

[0003] Ultrafast laser welding technology has advantages such as high energy density, ultra-short pulse width and small heat-affected zone, and can realize high-precision bonding of inorganic glass interfaces. If it is applied to the preparation of luminescent glass, not only stable structural bonding can be realized, but also precise distribution of luminescent centers can be promoted, so that high-efficiency and long-life luminescent performance can be obtained. SUMMARY

[0004] The purpose of the present application is to provide a luminescent glass preparation method and device based on ultrafast laser welding and photoluminescence detection, so as to solve the problems of uneven distribution of luminescent ions, low interface bonding strength, poor energy transfer efficiency and unstable luminescent performance in the prior art.

[0005] The technical scheme is as follows: 1. Preparation method The inorganic glass sheets to be welded are cleaned and dried; a luminescent functional material layer is introduced between the upper and lower glass sheets, which can be rare earth oxide powder, rare earth ion doped glass powder, quantum dots or fluorescent powder, etc.; the glass sheet assembly is fixed on a three-dimensional motion platform and placed in an atmosphere protection cavity to form an inert or vacuum atmosphere environment; the wavelength, pulse width, repetition frequency, average power and scanning trajectory of the ultrafast laser are set, and the wavelength of the ultrafast laser is matched with the absorption band of the luminescent functional material; under the driving of the computer control system, the ultrafast laser acts on the glass sheet interface through the focusing optical system to realize the welding of the glass sheet and the luminescent functional layer; the sample after welding is annealed to eliminate residual stress and improve the luminescent efficiency and stability.

[0006] 2. Preparation device The present application also provides a corresponding device, which comprises: an ultrafast laser light source for emitting a laser beam matched with the absorption band of the functional material; a focusing optical system for adjusting and focusing the laser beam; A three-dimensional motion platform and a fixed clamp are used for high-precision movement and stabilization of the sample; an atmosphere protection cavity is used to provide an inert or vacuum environment; a computer control system is used for parameter setting and path control; and an online photoluminescence detection module is used for real-time monitoring of the luminescence characteristics and dynamic adjustment of the laser parameters.

[0007] Compared with the prior art, the present application can: ensure uniform distribution of the luminescent functional material, improve energy transfer efficiency; significantly improve the interfacial bonding strength, reduce cracks and defects; avoid impurity pollution in an inert or vacuum environment, and enhance stability; realize optimization of luminescent performance through online detection and parameter adjustment; the process flow is simple, the equipment structure is compact, and the present application is suitable for large-scale preparation and industrial application. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 Flowchart of the luminescent glass preparation method of the present application based on ultrafast laser welding and photoluminescence detection; Figure 2 Structure schematic diagram of the luminescent glass preparation device of the present application based on ultrafast laser welding technology.

[0009] In the figure: 1 is an ultrafast laser light source; 2 is a focusing optical system; 3 is a three-dimensional motion platform; 4 is an atmosphere protection cavity; 5 is a fixed clamp; 6 is an upper inorganic glass sheet; 7 is a luminescent functional material interlayer; 8 is a lower inorganic glass sheet; 9 is an online photoluminescence detection module; and 10 is a computer control system. DETAILED DESCRIPTION Example 1

[0010] Two quartz glass sheets with a thickness of 1 mm were taken, and Er2O3 powder was uniformly added therebetween as a luminescent layer. The sample was fixed on the three-dimensional motion platform using the fixed clamp and placed in the nitrogen protection cavity. The ultrafast laser parameters were set as follows: wavelength 980 nm, pulse width 500 fs, repetition frequency 500 kHz, and average power 8 W. After welding and annealing treatment (400℃, 1h), the test results showed that the interfacial bonding strength of the quartz glass was greater than 20 MPa, the luminescent peak was located at 1530 nm, and the luminescent lifetime was increased by 30% compared with the untreated sample. Example 2

[0011] Two borosilicate glass sheets were used, and quantum dots (CdSe / ZnS) were uniformly coated on the interface. The laser parameters were set as follows: wavelength 800 nm, pulse width 1 ps, repetition frequency 1 MHz, and average power 12 W, and the welding path was a spiral trajectory. After welding and annealing, the borosilicate glass was enhanced in luminescence in the visible light band (red), and the quantum efficiency was increased by 25%. Example 3

[0012] A three-layered quartz glass stack is used, and Yb2O3 and Er2O3 are introduced into the interlayer in turn. Near-infrared multi-band luminescence is realized through ultrafast laser double-wavelength welding (980 nm and 1550 nm). The test results show that the interface is free of cracks, and the luminescence intensity superposition effect is obvious.

[0013] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications, changes, variations, substitutions, and equivalents will occur to those of ordinary skill in the art without departing from the spirit and scope of the application as defined by the following claims and their equivalents.

Claims

1. A method for preparing luminescent glass using ultrafast laser welding and photoluminescence detection, characterized in that, Includes the following steps: (1) Clean and dry the upper and lower inorganic glass sheets; (2) A light-emitting functional material is introduced between the upper inorganic glass sheet and the lower inorganic glass sheet, wherein the light-emitting functional material is rare earth oxide powder, rare earth ion doped glass powder, quantum dot or phosphor; (3) Fix the inorganic glass plate assembly on the three-dimensional motion platform and maintain an inert atmosphere or vacuum environment through the atmosphere protection cavity; (4) Set the wavelength, pulse width, repetition frequency, average power and scanning path of the ultrafast laser, wherein the wavelength is matched with the absorption band of the luminescent functional material; (5) Driven by a computer control system, ultrafast lasers act on the inorganic glass interface through a focusing optical system to achieve precise welding of inorganic glass sheets and luminescent functional materials. (6) Anneal the welded sample to eliminate residual stress and improve luminescence efficiency.

2. The method according to claim 1, characterized in that, The rare earth oxide powder includes one or more of Er2O3, Yb2O3, CeO2, and Nd2O3.

3. The method according to claim 1, characterized in that, The laser wavelength range is 700-1600nm, the pulse width is 100fs-10ps, and the repetition frequency is 100kHz-10MHz.

4. The method according to claim 1, characterized in that, The annealing process is carried out at a temperature of 300-600℃ for 0.5-3 hours.

5. An apparatus for preparing luminescent glass using ultrafast laser welding and photoluminescence detection, characterized in that, include: Ultrafast laser source, used to emit laser beams that match the absorption band of luminescent functional materials; A focusing optical system is used to adjust and focus a laser beam; A three-dimensional motion platform is used for precise movement of inorganic glass samples; a fixing fixture is used for stable fixation of inorganic glass samples. An atmosphere protection chamber is used to provide an inert gas or vacuum environment; a computer control system is used to set laser parameters and control the motion platform; and an online photoluminescence detection module is used to monitor the luminescence characteristics of the welding interface in real time.

6. The apparatus according to claim 5, characterized in that, The ultrafast laser source is a tunable dual-wavelength laser.

7. The apparatus according to claim 5, characterized in that, The three-dimensional motion platform is XYZ three-axis linkage, and the preferred resolution is 0.1μm.

8. The apparatus according to claim 5, characterized in that, The atmosphere protection chamber is a sealed structure that can maintain nitrogen, argon or other inert atmospheres.

9. The apparatus according to claim 5, characterized in that, The online photoluminescence detection module can output real-time spectral signals and is linked with the computer control system to dynamically adjust welding parameters.

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