CN201576698U

CN201576698U - Transparent ceramic white light LED device

Info

Publication number: CN201576698U
Application number: CN2010200044524U
Authority: CN
Inventors: 石云; 潘裕柏; 冯锡淇; 姜本学
Original assignee: Shanghai Institute of Ceramics of CAS
Current assignee: Shanghai Institute of Ceramics of CAS
Priority date: 2010-01-22
Filing date: 2010-01-22
Publication date: 2010-09-08
Anticipated expiration: 2020-01-22

Abstract

The utility model relates to a transparent ceramic white light LED device, characterized in that, which comprises a block transparent ceramic luminous body taken as the luminescent material, an LED chip and a carrier bearing the LED chip and the transparent ceramic luminous body, the carrier is provided with a groove, the LED chip is positioned at the bottom of the groove, the transparent ceramic luminous body is directly stacked on the LED chip or inlayed into the carrier. The device provided by the utility model has advantages of good optical homogeneity, low color temperature, and high brightness of the white light, can avoid the problem that the fluorescent granule must adopt the translucent resin to encapsulate, the packaging technology is simplified, the device heated influence is small, the service life is long, the structure is simple, the performance is good, and is especially suitable for the high power white light LED device.

Description

A kind of transparent ceramic white light LED part

Technical field

The utility model relates to a kind of white light LED part, relates to a kind of transparent ceramic white light LED part more precisely.Belong to LED luminescence technology field.

Background technology

White light LEDs (White light-emitting diode) has small-sized solidification, vibration resistance, instantaneous starting and fast-response (μ s), energy-conservation and the life-span is grown (ten thousand hours), many advantages such as green high-efficient, especially incandescent lamp, the efficiency of conventional light source such as fluorescent lamp and high-voltage gas discharging light has reached the limit nearly all, and be expected in 10 years from now on, improve one to twice based on the efficiency of LED lighting technology, can be widely used in various buildings and Landscape Lighting future, the LCD bias light, medical treatment, navigation, aviation, automotive lighting, and various portable lightings, be expected to as a kind of energy-conservation, green solid-state illumination (SSL) technology of environmental protection develops into new lighting source of the 4th generation.

The principle of luminosity of white light LEDs mainly is that fluorescent material is coated on blue-ray LED or the ultraviolet LED chip, realizes white light by wavelength Conversion.Yet current in the research and development process of white light LEDs, mainly there is following outstanding problem:

1). luminous efficiency is low, and color rendering is bad: the white light with blue-light LED chip and gold-tinted Ce:YAG phosphor combination are sent, because the red composition in the red-green-blue is few, cause the colour temperature of white light LEDs higher, decay is serious; Simultaneously blue-ray LED continues to light and can cause temperature to raise, and fluorescent material can be degenerated, and makes light extraction efficiency not high, is difficult to meet various lighting requirements; Though people begin to pay close attention to the scheme that adopts the ultraviolet chip to excite RGB three-wavelength fluorescent material in recent years, improve luminous efficiency and color rendering, but how to realize the synthetic of three-wavelength fluorescent material and evenly effectively applying on chip, make the chromaticity and the consistency of white light LEDs reach desirable state, be still the challenge that the insider faces.

2). colour temperature (CCT) changes: (it is the main challenge that faces at present that colour temperature changes for Phosphor converted, PC) white light LEDs for the fluorescent material conversion hysteria.The light that powder sends at blue light or ultraviolet chip by the time can produce phenomenons such as scattering and absorption, factors such as the pattern of the inhomogeneous and fluorescent material of coating thickness and particle diameter all can cause producing yellow hot spot, blue hot spot, problem such as the white light colour temperature is inconsistent.Need mix with silica gel when fluorescent material is coated on the blue chip in addition, because the most of energy heating of LED causes temperature to raise, fluorescent material luminous efficiency at high temperature reduces, at high temperature for a long time, the decay of fluorescent material is also bigger, and silica gel can wear out can influence useful life of fluorescent material.

Domestic patent application about the fluorescent material for white light LED aspect focuses mostly on aspect powder body material, also there are some patents to propose the technical scheme of substitution material, for example CN1815765A has proposed a kind of YAG chip-type white-light light-emitting-diode and method for packing thereof, rear-earth-doped YAG wafer is used as fluorescent material, but monocrystal material is compared pottery, has deficiency aspect machinery, mechanical stability, has limited the flexibility of processing and manufacturing, and crystal growth needs high temperature, and preparation cost is higher.And this technical scheme still needs the resin-encapsulated wafer, can not fundamentally solve the resin problem of aging that is heated.

And for example CN101338879A has proposed the method that a kind of YAG of utilization transparent ceramic prepares white light LEDs, but the actual coat that is meant the polycrystalline particle form of the transparent ceramic in this patent, ceramic particle is 1nm 300nm, rather than block ceramic, and is little with conventional fluorescent powder difference.

The utility model content

The purpose of this utility model is to provide a kind of transparent ceramic white light LED part, to overcome the prior art deficiency.

The transparent ceramic white light LED part that the utility model provides, it is characterized in that comprising block transparent ceramic luminous element as luminescent material, the carrier of led chip and carrying led chip and transparent ceramic luminous element, carrier offers groove, led chip is positioned at bottom portion of groove, and the transparent ceramic luminous element directly overlays on the led chip or is embedded in the carrier.Bottom portion of groove is provided with metal lead wire.

The LED device that the utility model provides is to be luminous element with the polycrystalline transparent ceramic, excites down at blue-light LED chip or ultraviolet LED chip, and it is good to obtain optical homogeneity, the white light that colour temperature is low.

The LED device architecture that the utility model provides is characterised in that luminous element directly overlays on blue-light LED chip or the ultraviolet leds chip with the form of block; Or be embedded on blue-light LED chip or the ultraviolet leds chip, after chip excites, exciting light is mixed with stimulated light emission, or mix between the stimulated light emission, form white light;

The structural feature of the utility model is, need not the resin-encapsulated luminous element, simplified encapsulation technology, thereby the luminous efficiency of effectively having avoided resin caused by heat ageing reduces problem, and given full play to the advantage of transparent ceramic on machinery, mechanics and thermal property.

Because the utility model has utilized special structure and transparent ceramic luminous element, has given full play to the advantage of transparent ceramic material:

1) luminescent material of transparence can solve fluorescent material to scattering of light and absorption, improves luminous efficiency;

2) there is not the segregation coefficient problem of monocrystalline in pottery, can realize that the high concentration of multiple light emitting ionic evenly mixes altogether, thereby can be by accurately controlling the transmitance of potsherd fluorophor, various parameters such as luminous wave band, regulate and the gold-tinted of control fluorophor potsherd conversion and the blue light that is not converted between ratio, utilize the uniformity of transparent ceramic self, the high-quality white light of acquisition homogeneous, and can carry out luminescent designs, the exploitation new material;

3) transparent ceramic has excellent machinery and thermodynamic property, anti-vibration, thermal conductivity is good, can solve blue-ray LED and continue to light down the various luminous problem that temperature raises and causes, further improve the stability of photoluminescence and the useful life of device, especially be fit to large power white light LED part;

4) ceramic phase is to monocrystalline, in moulding with the labyrinth design is easy to prepare has advantage, and dystectic relatively Ce:YAG system (1950 ℃ of fusing points), pottery does not need fusion, just can fire success at a lower temperature, and commercial cost is cheap, and development prospect is wide.

Description of drawings

Fig. 1 is that the white light LED part that utility model provides directly stacks the formula structural representation;

Fig. 2 is the white light LED part embedded structure schematic diagram that utility model provides.

Embodiment

White light LED part shown in attached Fig. 1 and 2 wherein 2 is represented led chip, can be blue light or ultraviolet LED chip; 1 expression transparent ceramic block can be at stimulated luminescence under the led chip, and the light that led chip 2 sends and 1 is stimulated behind the even mixed light of light that sends, the generation white light; The component carrier of 3 expression carrying led chips and ceramic luminous element, the carrier bottom is provided with metal lead wire, links with led chip.Carrier offers groove, and led chip is positioned at bottom portion of groove, connects power lead.

It is characterized in that, on the led chip of bottom portion of groove, can directly stack the block transparent ceramic, as luminescent material, do not need to fill the light-transmissive resin encapsulation, but simplify encapsulation technology, and avoided under the long-time use of high power, the aging white light inequality that causes of light-transmissive resin, luminous efficiency reduces problem;

Further advantage is, because the block of transparent ceramic just has good heat-conducting and mechanical property, machining property is good, the transparent ceramic luminous element can be inlayed to be fixed on the carrier, and the middle fixed gap that keeps is further optimized heat dispersion.Described distance≤5cm is 0.1-5mm as the transparent ceramic luminous element thickness of luminescent material, excites down at led chip, sends a kind of or multiwave light.

Claims

1. transparent ceramic white light LED part, it is characterized in that comprising block transparent ceramic luminous element as luminescent material, the carrier of led chip and carrying led chip and transparent ceramic luminous element, carrier offers groove, led chip is positioned at bottom portion of groove, and the transparent ceramic luminous element directly overlays on the led chip or is embedded in the carrier.

2. by the described transparent ceramic white light LED part of claim 1, it is characterized in that described led chip is blue-light LED chip or ultraviolet LED chip.

3. by the described transparent ceramic white light LED part of claim 1, it is characterized in that bottom portion of groove is provided with metal lead wire.

4. by the described transparent ceramic white light LED part of claim 1, it is characterized in that being embedded in the transparent ceramic luminous element in the carrier and the distance≤5cm of led chip.

5. by the described transparent ceramic white light LED part of claim 1, the thickness that it is characterized in that described transparent ceramic luminous element is 0.1-5mm.