How does the luminous efficiency of white LEDs increase?

In the past, LED manufacturers have developed large-size LED chips in order to obtain sufficient white-light patch LED beams. In this way, the LED chips are trying to achieve the desired goals. However, when the power applied by the white-strip LEDs continues to exceed 1 W, the light beams will decrease. The relative reduction of 20 to 30%, in other words, if the brightness of white LEDs is several times larger than that of conventional LEDs, and the power consumption characteristics are expected to exceed fluorescent lamps, it is necessary to overcome the following four major problems, including: suppressing temperature rise and ensuring white light. LED lifetime, improved luminous efficiency, and equalization of luminescence properties.
The specific method for temperature rise is to reduce the thermal impedance of the package; the specific method for maintaining the service life of the white LED is to improve the chip shape and use a small chip; to improve the luminous efficiency of the white LED, the specific method is to improve the chip structure and adopt a small chip; As for the specific method of uniformizing the luminescent characteristics, an improved packaging method for white-light patch LEDs has been developed.
Is the fundamental way to solve the heat problem package: due to the increased power it will cause thermal impedance of the package fell sharply 10K / W or less, foreign operators have developed high-temperature white SMD LED would try to improve these problems, but in fact large The power of the power LED is several times higher than that of the low-power LED, and the temperature rise will cause the luminous efficiency to drop sharply. Even if the packaging technology allows high heat, the bonding temperature of the LED chip may exceed the allowable value. Finally, the operator finally It is understood that solving the heat dissipation problem of the package is the fundamental method.
The service life of white LEDs, such as the use of silicon packaging materials and ceramic packaging materials, can increase the lifetime of white LEDs by a single digit, especially the white LED's emission spectrum contains short wavelengths of light below 450nm. The epoxy resin encapsulation material is easily destroyed by short-wavelength light. The large amount of high-power white LEDs accelerates the degradation of the packaging material. According to the test results of the industry, the continuous lighting is less than 10,000 hours, and the brightness of the high-power white-light patch LED has been reduced. More than half of the basic requirements for the long life of the illumination source cannot be met.
Regarding the luminous efficiency of the white-light patch LED, and improving the chip structure and package structure, the same level as the low-power white LED can be achieved. The main reason is that when the current density is increased by more than 2 times, it is not easy to take out light from a large chip, but the result will instead The luminous efficiency is not as good as that of the low-power white-light patch LED. If the electrode structure of the chip is improved, the above-mentioned light-taking problem can be solved theoretically.
This article comes from: LED Technology Forum

The Micro Vibration Motor is introduced:

Micro Vibration Motor is mainly used for adult health care products and toys, micro vibration motor is a Dc Motor, the motor shaft with an eccentric wheel, the use of most of the micro vibration motor voltage is lower than 6 v, probably between 6 mm to 15 mm in diameter, when the motor rotation, eccentric circle particles is not the core of the motor, the motor often lose their balance, due to the inertia effect.

Characteristics: small volume, strong vibration;

Features: small size, fast speed, stable performance, low price, can use battery drive,Can change the different materials of the pendulum head
Vibration Motor  Vibration Motor
Method of use: the best stable in horizontal plane, installed on the dc Micro vibration motor  output shaft parts, cannot use a hammer to knock, knock prone to press into the Micro vibration motor drive, may cause damage to internal components, and cannot be used in the case of blocked.

vibration motor

Operating temperature range:

Mini Vibration Motor should be used at a temperature of -10~60℃.

The figures stated in the catalog specifications are based on use at  ordinary room temperature catalog specifications re based on use at ordinary room temperature  (approximately20~25℃.

If a Mini Vibration Motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.

Storage temperature range:

Mini Vibration Motor should be stored ta a temperature of -15~65℃.

In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.

Service life:

The longevity of Mini Vibration Motor is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.

●Use with a load that exceeds the rated torque

●Frequent starting

●Momentary reversals of turning direction

●Impact loads

●Long-term continuous operation

●Forced turning using the output shaft

●Use in which the permitted overhang load or the permitted thrust load is exceeded

●A pulse drive ,e.g.,a short break,counter electromotive force,PWM control

●Use of a voltage that is nonstandard as regards the rated voltage

●Use outside the prescribed temperature or relative-humidity range,or in a special environment.

●Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.

when it come to volume production,we're a major player as well .each month,we rurn out  600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you Looking forward to your inquiry. Welcome to our factory.

vibration motor

Micro Vibration Motor

Micro Vibration Motor,Mini Vibration Motor,Dc Micro Vibration Motor,Electric Micro Vibration Motor

Shenzhen Shunchang Motor Co., LTD. ,

Posted on