Warm white light light-emitting diode (LED) and lithium matter fluorescent powder thereof

Abstract

The invention relates to a warm white light light-emitting diode (LED) and lithium matter fluorescent powder thereof, wherein the lithium matter fluorescent powder is used in the warm white light LED, adopts oxides of Ith and IIIth main group elements in a periodic table of elements as a matrix, and takes elements with transition in electron d layer and f layer as activation elements; the matrix of the fluorescent powder is formed by solid solutions of similar aluminates of lithium and yttrium, with the chemical formula of Li alpha (Gd1-xYx) 3AI5 plus alpha O12 plus 2 alpha: TR; and when the matrix is activated by short wave radiation, ion of the activation element can give off yellow orange light which is mixed with short wave radiation emitted by InGaN semiconductor heterojunction to form the warm white light. The warm white light LED uses the fluorescent powder to ensure that partial transmission can reach 15 to 30 percent of first-level blue light radiation of the InGaN semiconductor heterojunction, and 70 to 85 percent of the second orange-yellow radiation. In addition, the invention also discloses a preparation method of the fluorescent powder.

Description

technical field [0001] The invention relates to a fluorescent powder and a warm white light emitting diode thereof, in particular to a fluorescent powder capable of obtaining high luminous efficiency and a warm white light emitting diode thereof. Background technique [0002] Light-emitting diodes came out in 1965, when engineers developed the first light-emitting diode devices based on GaAs (gallium arsenide). This is a low-power light-emitting diode with a luminous flux F≤0.01 lumens that emits light in the red area. In the 1970s and 1980s, the development of light-emitting diodes was very slow. By the early 1990s, the luminous flux of better green light-emitting diodes did not exceed 0.1-0.3 lumens. [0003] Since 1968, phosphors and phosphor-based spectral conversion structures have been widely used in light-emitting diode technology. What first appeared was a conversion device that increases the luminous frequency, and converts the near-infrared luminescence of GaAsP ...

AI Technical Summary

Problems solved by technology

[0017] Although this architecture has been widely used, it cannot be ignored that it also has some substantial disadvantages: the layer 7 of phosphor particles with uneven concentration in the polymer will lead to uneven brightness and color of light-emitting diodes ; the lack of a capping layer at the radiative edge of a nitride semiconductor heterojunction 1 leads to a large amount of blue radiation

In particular, this color is like the color of a human face. It looks comfortable under incandescent lighting, but the color tone under fluorescent lighting is unnatural, which is really a fly in the ointment.

Images