EL

Phosphor

Germany A
  High Brightness

Germany B
  Normal Long Lifetime

China C
  Long Lifetime

China D
  Normal

Explanation

Grade

Price
  (USD)

No

No

1-10 grade

11-12 grade

The life stability range of each grade is 5-15%,   according to the cost, artificial mixture is adjusted at any time.

Lifetime

Half-lifetime
  >3000hr

Full lifetime
  >10000hr

Half-lifetime
  2000hr

Full lifetime
  >5000hr

Full lifetime
  3000-100hr

Full lifetime
  10-5hr

Professional detection: humidity is 95%, temperature is 80 degrees and discontinuous work for 3-50hr to detect black spot.

Brightness

100-150

Cd/m2

80-120

Cd/m2

80-120

Cd/m2

100-130

Cd/m2

Poor quality products are often claimed with high   brightness and long lifetime. Increasing brightness is achieved by changing the power of electronic device.   This way can not solve the problem of stability.

Anti voltage breakdown

A class standard Voltage is 180-440V

B class standard Voltage is 180V

C class standard Voltage is 160V

D class standard Voltage is 140V

Determined by the material and technology, short life materials are prone to   heat, breakdown, inflammable and explosive batteries.

Application

Indoor and outdoor.

Indoor

Indoor and disposable

Disposable

The adjustment is based on the using seasons, different regions,   customer requirements, cost and so on.

Failure rate

<0.3%

<2%

<10%

Heat,breakdown,   fast aging and has black spots.

<18%

Sparks from   short circuit and circuit breakage. 

Uncontrollable and   unpredictable.The unilateral defects of EL panel or inverter cause   unstable coordination among them.

The proportion   of cost

70%

40%

30-20%

10%

The selection of EL phosphor is   the main factor of the different price of EL panel.

Solving method

1.Looking at the purchase   contract of EL phosphor.Cheap prices are mainly derived from low   quality EL phosphor.Low quality product not only has a high failure   rate,but also the safety factor is low.Even DC3V is prone to breakdown and   lead to fire.

2.Provide the documentary evidence   of intellectual property rights.The counterfeit and inferior   products have no research and intellectual property rights, especially the   enterprises have no patent (Privately holding patents in China can evade   mandatory safety testing and do not bear legal liability)

3.Provide the case of   undertaking government projects.The large EL panel can be mass   produced, the small EL panel is stable, and the public product   has strict requirements.

4.Provide the quality   inspection report in China.Because purchasers do not have   professional and testing conditions, poor quality products are often   claimed with high brightness and long lifetime. Increasing brightness is   achieved by changing the power of electronic device. This way can not solve the   problem of stability. Therefore, low price and high brightness products are   common sales pitfalls. Low price profits must come from low quality raw   materials.

5.Data measuring condition   identification: Low quality and high brightness is obtained from high   voltage and high frequency.While lifetime is obtained at low voltage and low   frequency.The description is obtained from different test conditions, and   only describes the brightness and life expectancy that buyers like.

6.Identify whether the manufacturer   has professional technical history and inheritance,whether to cooperate   with large retail enterprises to embody its quality control capability and   enterprise value orientation. The risk of a businessman is not to   sell fast and earn less,but has no the security of legal.

7.Low price and high quality products   do not exist. If the procurement budget is low, the cost can be   reduced by special luminescence design.Longer lifetime and higher   brightness need other design ,accept or reject and a high level of   technical team.

Other factors

Environmental protection materials and   general materials; Surface dyes and inverter.

Safety test: The stability of   inverter.High voltage and high frequency lead to a rapid increase in   brightness and a significant reduction in lifetime.

Intellectual property: KPT has 120   authorized patents in China and the United States.The data obtained in   accordance with international standard AC115V\400Hz conditions. Market data   are non - standard using AC112-140V, 800-1000Hz.