White light emitting diode and backlight module

US11367811B2 · kind B2 · utility

Assignee

• APT ELECTRONICS CO., LTD. · CN

Inventors

• Shuguang Yao · Tangxia, CN
• Chuiming Wan · Longbeilingcun, CN
• Xiaofeng Long · Tangxia, CN
• ChiWing Keung · Tangxia, CN
• Zhaoming ZENG · Shanghai, CN
• Guowei David Xiao · 流花街道, CN

Key dates

• Filing date: May 27, 2020
• Grant date: Jun 21, 2022
• Expiry date: Aug 7, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2224/48137
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A white LED including red phosphor, at least one blue LED chip and at least one green LED chip, wherein a red light, a blue light and a green light are mixed simultaneously to produce a white light. The red phosphor comprises a first red phosphor and a second red phosphor. The first red phosphor is made from a substance having structure formula M2AX6:Mn4+, wherein the element M is selected from Li, Na, K, Rb or Cs, the element A is selected from Ti, Si, Ge or Zr, and the element X is selected from F, Cl or Br; the ratio of the second red phosphor to the red phosphor ranges from 0.01% to 15%. Further provided is a backlight module. The adjustably colored points of a device comprising M2AX6:Mn4+ are achieved by adding a second red phosphor to the red phosphor comprising M2AX6:Mn4+.