Title: Electrochromic window with high reflectivity modulation

Abstract

A multi-layered, active, thin film, solid-state electrochromic device having a high reflectivity in the near infrared in a colored state, a high reflectivity and transmissivity modulation when switching between colored and bleached states, a low absorptivity in the near infrared, and fast switching times, and methods for its manufacture and switching are provided. In one embodiment, a multi-layered device comprising a first indium tin oxide transparent electronic conductor, a transparent ion blocking layer, a tungsten oxide electrochromic anode, a lithium ion conducting-electrically resistive electrolyte, a complimentary lithium mixed metal oxide electrochromic cathode, a transparent ohmic contact layer, a second indium oxide transparent electronic conductor, and a silicon nitride encapsulant is provided. Through elimination of optional intermediate layers, simplified device designs are provided as alternative embodiments. Typical colored-state reflectivity of the multi-layered device is greater than 50% in the near infrared, bleached-state reflectivity is less than 40% in the visible, bleached-state transmissivity is greater than 60% in the near infrared and greater than 40% in the visible, and spectral absorbance is less than 50% in the range from 0.65-2.5 .mu.m.

Inventors:

Goldner, Ronald B ^[1]; Gerouki, Alexandra ^[2]; Liu, Te-Yang ^[3]; Goldner, Mark A ^[4]; Haas, Terry E ^[5]

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+ Show Inventor Affiliations

1. Lexington, MA
2. Medford, MA
3. Arlington, MA
4. Cambridge, MA
5. Southborough, MA

Issue Date:

Sat Jan 01 00:00:00 EST 2000

Research Org.:

Tufts University

OSTI Identifier:

873118

Patent Number(s):

6094292

Assignee:

Trustees of Tufts College (Medford, MA)

Patent Classifications (CPCs):

E - FIXED CONSTRUCTIONS E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL E06B - FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES

G - PHYSICS G02 - OPTICS G02F - DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING

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E - FIXED CONSTRUCTIONS E06 - DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL E06B - FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES

E06B9/24 - Screens or other constructions affording protection against light, especially against sunshine

G - PHYSICS G02 - OPTICS G02F - DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING

G02F1/1524 - Transition metal compounds
G02F1/1525 - {characterised by a particular ion transporting layer, e.g. electrolyte}
G02F1/161 - Gaskets
G02F2001/1502 - {complementary cell}
G02F2001/1536 - {additional, e.g. protective, layer inside the cell}
G02F2001/1555 - {Counter electrode}

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DOE Contract Number:  

FG02-95ER14578

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

electrochromic; window; reflectivity; modulation; multi-layered; active; film; solid-state; device; near; infrared; colored; transmissivity; switching; bleached; absorptivity; fast; times; methods; manufacture; provided; embodiment; comprising; indium; oxide; transparent; electronic; conductor; blocking; layer; tungsten; anode; lithium; conducting-electrically; resistive; electrolyte; complimentary; mixed; metal; cathode; ohmic; contact; silicon; nitride; encapsulant; elimination; optional; intermediate; layers; simplified; designs; alternative; embodiments; typical; colored-state; 50; bleached-state; 40; visible; 60; spectral; absorbance; range; 65-2; electrically resistive; intermediate layers; alternative embodiments; contact layer; near infrared; indium oxide; mixed metal; silicon nitride; metal oxide; device comprising; intermediate layer; ohmic contact; alternative embodiment; electronic conductor; electrochromic device; tungsten oxide; transparent ohmic; electrochromic window; /359/427/