| In the case of increasingly scarce energy,white light emitting diodes(WLEDs)have attracted great attention in various fields due to their high working efficiency,power saving,good shock absorption effect,no pollution,short response time and long life cycle.However,with the development of technology,WLEDs with only high power and high brightness performance can no longer meet the needs of the market.It has become a trend to develop full-visible-spectrum WLEDs with luminous characteristics similar to sunlight(at the same color temperature),they have a higher color rendering index,higher luminous efficiency and stronger color reproduction ability,and can also solve problems such as excessive blue light harm to the human body.This article mainly discusses the luminescence performance and reliability performance of full-visible-spectrum fluorescent materials,and studies the luminescence performance and reliability of full-visible-spectrum LEDs prepared by dispensing and color conversion films packaging methods.By supplementing short-wave blue-green light and long-wave red light,to a certain extent,reduce the harm caused by LED to the body due to "rich blue".In addition,this paper also studied the luminescence performance and reliability of blue-green color conversion glass and YAG yellow-green color conversion glass under reducing atmosphere,and put forward ideas for further research on full-visible-spectrum color conversion glass.The completed work has the following points:1.YAG yellow-green color conversion glass and BSON blue-green color conversion glass are made of glass matrix doped with corresponding phosphors and fired in a muffle furnace at low temperature.Put the crucible containing the homogeneous mixture of the glass matrix and the yellow-green phosphor into the muffle furnace under the CO reducing atmosphere to sinter the glass to effectively reduce the oxidized Ce4+,so that the luminous performance of color conversion glass in a reducing atmosphere is significantly improved than that in an air atmosphere sintering condition,And control the doping ratio of blue-green phosphors,and explore the influence of different sintering temperatures on the luminous performance of blue-green phosphor in glass.2.Successfully prepared BSON blue-green color conversion glass with different doping concentration and composite phosphor film with different arrangement and different doping concentration by low-temperature co-sintering method and spin coating method.Control the optimal sintering temperature of color conversion glass,and explore the influence of different doping concentrations of blue-green phosphors on the luminescence performance of color conversion glass.In addition,after three reliability aging tests,the relationship between the reliability of blue-green color conversion glass and the doping concentration of phosphors was also explored.Explore the influence of different arrangements of the same doping concentration on the luminescence performance of the composite phosphor film,and explore the relationship between the reliability of the composite phosphor film and the different arrangements of the film through three reliability aging tests.Explore the effect of the same arrangement of different doping concentrations on the luminescence performance of the composite phosphor film,and through three reliability aging tests to explore the relationship between the reliability of the composite phosphor film and the different doping concentrations of the film.3.Through the LED dispensing method and the LED phosphor film packaging method,the full-visible-spectrum LED with different red phosphor doping concentrations and the full-visible-spectrum LED encapsulated with composite phosphor film with different arrangements and different doping concentrations were successfully prepared.Explore the influence of different red phosphor doping ratios on the luminous performance of the packaged LEDs and explore the relationship between the reliability of LED samples and the different doping ratios of red phosphors after three reliability aging tests.Explore the effect of LED samples encapsulated by composite phosphor films with different arrangements under the same doping concentration on the luminous performance of LEDs encapsulated by composite phosphor films,and through three reliability aging tests to explore the relationship between the reliability of the composite phosphor film packaged LED and the different arrangements of the film.Explore the effect of LED samples encapsulated by composite phosphor films with different doping concentrations in the same arrangement on the luminous performance of LEDs encapsulated by composite phosphor films,and through three reliability aging tests to explore the relationship between the reliability of the composite phosphor film encapsulated LED and the different doping concentrations of the film. |
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