White light LED with modified structure

Abstract

The invention relates to the technical field of LED, namely, a structure-improved white light LED. Positive and negative electrodes of a LED wafer are respectively led out by leads and extended to be connected with a leading pin or a frame out of a lens shield which shades the wafer. The invention is characterized in that at least one wafer is fixed on a cup-shaped groove or platform on a base or the frame. The external surface of the wafer is provided with light permeable and heat insulating medium, wherein, the external surface of the medium or the lens shield is coated with a layer of fluorescent powder. The invention has the advantages that the fluorescent powder is separated from the wafer, so as to prevent the fluorescent powder from blackening caused by thermal aging and carbonization, stabilize the color temperature and lighting strength and improve the optical efficiency by 16 to 36 percent. After aging test of 5000 hours, the luminous flux of the product is more than 90 percent of the original luminous flux, so that the invention can be used for producing various lamps such as serial LED lamps, LED signal lamps, LED indicating lamps and LED decorative lamps.

Description

Technical field: [0001] The invention relates to the technical field of light-emitting diodes (LEDs), in particular to a structure-improved white light-emitting diode. Background technique: [0002] Light-emitting diode (LED) is a semiconductor solid light-emitting device. It uses a solid semiconductor wafer as a light-emitting material. When a forward voltage is applied to both ends, the carriers in the semiconductor recombine to cause photon emission to generate light. It is the most The popular light source technology, the characteristics of LED light source are: energy saving: energy consumption is reduced by 80% compared with incandescent lamps with the same light effect; using low voltage power supply (between 6-24V), good safety; small size, can be prepared into various Shaped devices; long life; fast response time: the response time of incandescent lamps is milliseconds, and the response time of LED lamps is nanoseconds; no harmful metal mercury pollution to the envi...

AI Technical Summary

Problems solved by technology

[0004] Prior Art 1: As shown in Figure 1, the LED lamp consists of a two-legged lead frame 01 and a wafer 02 placed in a bracket bowl, phosphor powder 03 covering the wafer 02, and a ring encapsulating the wafer 02. Oxygen resin 04, the disadvantage is that the chip 02 and the phosphor 03 are seamlessly covered when the epoxy resin 04 is packaged, the light and heat emitted by the chip 02 will accelerate the aging of the phosphor 03, and the thick package of epoxy resin makes the LED The heat dissipation effect becomes poor, and the heat dissipation capacity of the two-legged lead bracket 01 is insufficient, which leads to the reduction of the light efficiency and life of the LED

[0005] Prior art 2: Aiming at the shortcomings of the above-mentioned products, Chinese Patent No. 200620015677.3 (see Fig. 2) has beneficially improved the LED lamp. There is a wafer 4, the outer surface of the wafer 4 is coated with a layer of phosphor powder 5, the substrate 2 is sealed with an anti-ultraviolet hollow lens cover 7, the cavity of the lens cover 7 is filled with an inert gas 8, the positive and negative of the wafer 4 The poles are respectively drawn out with lead wires 6 and connected to the guide pins 1 extending out of the lens cover 7. This structure reduces the temperature around the wafer 4 due to the thermal conductivity of the columnar substrate 2, the guide pins 1 and the inert gas 8, but After research, it is found that due to the direct contact between the chip 4 and the phosphor powder 5, the phosphor powder 5 is directly heated, causing the phosphor powder 5 to be easily aged rapidly and carbonized and blackened, so that the blue light emitted by the blue chip and the phosphor powder 5 are combined to generate white light. In a short period of time, luminous flux decreases, large-scale light attenuation, color temperature change, until the phenomenon of dead light or LED lamp scrapping occurs from time to time. Therefore, only by reducing the ambient temperature of the phosphor powder can the aging and carbonization of the phosphor powder be prevented. , keep the color temperature unchanged, further prolong the working life of the LED lamp, and improve the light efficiency of the LED lamp

Images